[国际标准]ASMEB18.2.2-1987方螺母和六角螺母(英制系列)标准
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[国际标准]ASMEB18.2.2-1987方螺母和六角螺母(英制系列)标准,国际标准,ASMEB18,2.2,1987,螺母,六角,英制,系列,标准
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中华人民共和国国家标准环境管理体系 规范及使用指南Environmental management systemsSpecification with guidance for use GB/T 24001-1996 idt ISO 14001:19961.范围 本标准规定了对环境管理体系的要求，使一个组织能够根据法律要求和重大环境影响信息，制定环境方针与目标。它适用于那些可为组织所控制，以及可能希望组织对其施加影响的环境因素。但它本身并未提出具体的环境表现（行为）准则。 本标准适用于任何有下列愿望的组织： a）实施、保持并改进环境管理体系； b）使自己确信能符合所声明的环境方针； c）向外界展示符合性； d）寻求外部组织对其环境管理体系的认证/注册； e）对符合本标准的情况进行自我鉴定和自我声明。 本标准中所有的要求都适用于任何一个环境管理体系。其应用程度取决于组织的环境方针、活动性质、运行条件等因素。本标准还在附录A中对如何使用本规范提供了提示性的指南。 对于本标准的任何应用，都应明确界定其范围。 注:为使用方便起见，“规范”部分和附录A中的条目采用了互相对应的序号，例如，4.3.3和A3.3的内容都是关于环境目标和指标的叙述, 4.5.4和A5.4的内容都是关于环境管理体系审核等。 2. 引用标准 目前尚无引用标准。 3. 定义 下列定义适用于本标准： 3.1 持续改进 continual improvement 强化环境管理体系的过程，目的是根据组织的环境方针，实现对整体环境表现（行为）的改进。 注:该过程不必同时发生于活动的所有方面。 3.2 环境 environment 组织运行活动的外部存在，包括空气、水、土地、自然资源、植物、动物、人，以及它们之间的相互关系。 注:从这一意义上,外部存在从组织内延伸到全球系统。 3.3 环境因素 environmental aspect 一个组织的活动、产品或服务中能与环境发生相互作用的要素。 注:重要环境因素是指具有或能够产生重大环境影响的环境因素。 3.4 环境影响 environmental impact 全部或部分地由组织的活动、产品或服务给环境造成的任何有害或有益的变化。 3.5 环境管理体系 environmental management systems 整个管理体系的一个组成部分，包括为制定、实施、实现、评审和保持环境方针所需的组织机构、计划活动、职责、惯例、程序、过程和资源。 3.6 环境管理体系审核 environmental management system audit 客观地获取审核证据并予以评价，以判断组织的环境管理体系是否符合所规定的环境管理体系审核准则的一个以文件支持的系统化验证过程，包括将这一过程的结果呈报管理者。 3.7 环境目标 environmental objective 组织依据其环境方针规定自己所要实现的总体环境目的，如可行应予以量化。 3.8 环境表现（行为） environmental performance 组织基于其环境方针、目标和指标，对它的环境因素进行控制所取得的可测量的环境管理体系结果。 3.9 环境方针 environmental policy 组织对其全部环境表现（行为）的意图与原则的声明，它为组织的行为及环境目标和指标的建立提供了一个框架。 3.10 环境指标 environmental target 直接来自环境目标，或为实现环境目标所需规定并满足的具体的环境表现（行为）要求，它们可适用于组织或其局部，如可行应予以量化。 3.11 相关方 interested party 关注组织的环境表现（行为）或受其环境表现（行为）影响的个人或团体。 3.12 组织 organization 具有自身职能和行政管理的公司、集团公司、商行、企事业单位、政府机构或社团，或是上述单位的部分或结合体，无论其是否法人团体、公营或私营。 注:对于拥有一个以上运行单位的组织，可以把一个运行单位视为一个组织。 3.13 污染预防 prevention of pollution 旨在避免、减少或控制污染而对各种过程、惯例、材料或产品的采用，可包括再循环、处理、过程更改、控制机制、资源的有效利用和材料替代等。 注:污染预防的潜在利益包括减少有害的环境影响、提高效益和降低成本。 4 环境管理体系要求 4.1 总要求 组织应建立并保持环境管理体系。本章描述了对环境管理体系的要求。 4.2 环境方针 最高管理者应制定本组织的环境方针并确保它: a) 适合于组织活动、产品或服务的性质、规模与环境影响； b) 包括对持续改进和污染预防的承诺； c) 包括对遵守有关环境法律、法规和组织应遵守的其它要求的承诺； d) 提供建立和评审环境目标和指标的框架； e) 形成文件，付诸实施，予以保持，并传达到全体员工； f) 可为公众所获取。4.3 规划（策划） 4.3.1 环境因素 组织应建立并保持一个或多个程序，用来确定其活动、产品或服务中它能够控制，或可望对其施加影响的环境因素，从中判定那些对环境具有重大影响，或可能具有重大影响的因素。组织应确保在建立环境目标时，对与这些重大影响有关的因素加以考虑。 组织应及时更新这方面的信息。4.3.2 法律与其他要求 组织应建立并保持程序，用来确定适用于其活动、产品或服务中环境因素的法律，以及其它应遵守的要求，并建立获取这些法律和要求的渠道。 4.3.3 目标和指标 组织应针对其内部每一有关职能和层次，建立并保持环境目标和指标。环境目标和指标应形成文件。 组织在建立与评审环境目标时，应考虑法律与其他要求，它自身的重要环境因素、可选技术方案、财务、运行和经营要求，以及各相关方的观点。 目标和指标应符合环境方针，并包括对预防污染的承诺。4.3.4 环境管理方案 组织应制定并保持一个或多个旨在实现环境目标和指标的环境管理方案，其中应包括： a) 规定组织的每一有关职能和层次实现环境目标和指标的职责, b) 实现目标和指标的方法和时间表。 如果一个项目涉及到新的开发和新的或修改的活动、产品或服务，就应对有关方案进行修订，以确保环境管理与该项目相适应。4.4 实施与运行 4.4.1 组织机构和职责 为便于环境管理工作的有效开展，应当对作用、职责和权限作出明确规定、形成文件，并予以传达。 管理者应为环境管理体系的实施与控制提供必要的资源，其中包括人力资源和专项技能、技术以及财力资源。 组织的最高管理者应指定专门的管理者代表，无论他（们）是否还负有其他方面的责任，应明确规定其作用、职责和权限，以便： a) 确保按照本标准的规定建立、实施与保持环境管理体系要求； b) 向最高管理者汇报环境管理体系的运行情况以供评审,并为环境管理体系的改进提供依据。4.4.2 培训、意识与能力 组织应确定培训的需求。应要求其工作可能对环境产生重大影响的所有人员都经过相应的培训。 应建立并保持一套程序，使处于每一有关职能与层次的人员都意识到： a) 符合环境方针与程序和符合环境管理体系要求的重要性； b) 他们工作活动中实际的或潜在的重大环境影响，以及个人工作的改进所带来的环境效益； c) 他们在执行环境方针与程序，实现环境管理体系要求，包括应急准备与响应要求方面的作用与职责； d) 偏离规定的运行程序的潜在后果。 从事可能产生重大环境影响的工作的人员应具备适当的教育、培训和（或）工作经验，从而胜任他所担负的工作。4.4.3 信息交流 组织应建立并保持一套程序，用于有关其环境因素和环境管理体系的 a) 组织内各层次和职能间的内部信息交流； b) 与外部相关方联络的接收、文件形成和答复。 组织应考虑对涉及重要环境因素的外部联络的处理，并记录其决定。4.4.4 环境管理体系文件 组织应以书面或电子形式建立并保持下列信息： a) 对管理体系核心要素及其相互作用的描述； b) 查询相关文件的途径。4.4.5 文件控制 组织应建立并保持一套程序，以控制本标准所要求的所有文件，从而确保： a) 文件便于查找； b) 对文件进行定期评审，必要时予以修订并由受权人员确认其适宜性； c) 凡对环境管理体系的有效运行具有关键作用的岗位，都可能得到有关文件的现行版本； d) 迅速将失效文件从所有发放和使用场所撤回，或采取其他措施防止误用； e) 对出于法律和（或）保留信息的需要而留存的失效文件予以标识。 所有文件均须字迹清楚，注明日期（包括修订日期），标识明确，妥善保管，并在规定期间内予以留存。应规定并保持有关建立和修改各种类型文件的程序与职责。4.4.6 运行控制 组织应根据其方针、目标和指标，确定与所标识的重要环境因素有关的运行与活动。应针对这些活动（包括维护工作）制定计划，确保它们在程序规定的条件下进行。程序的建立应符合下述要求： a) 对于缺乏程序指导可能导致偏离环境方针和目标与指标的运行，应建立并保持一套以文件支持的程序； b) 在程序中对运行标准予以规定； c) 对于组织所使用的产品和服务中可标识的重要环境因素，应建立并保持一套管理程序，并将有关的程序与要求通报供方和承包方。4.4.7 应急准备和响应 组织应建立并保持一套程序，以确定潜在的事故或紧急情况，做出响应，并预防或减少可能伴随的环境影响。 必要时，特别是在事故或紧急情况发生后，组织应对应急准备和响应的程序予以评审和修订。 可行时，组织还应定期试验上述程序。4.5 检查和纠正措施 4.5.1 监测和测量 组织应建立并保持一套以文件支持的程序，对可能具有重大环境影响的运行与活动的关键特性进行例行监侧和测量。其中应包括对环境表现、有关的运行控制、对组织环境目际和指标符合情况的跟踪信息进行记录。 监测设备应予校准并妥善维护，并根据组织的程序保存校准与维护记录。 组织应建立并保持一个以文件支持的程序，以定期评价对有关环境法律、法规的遵循情况。4.5.2 不符合，纠正与预防措施 组织应建立并保持一套程序，用来规定有关的职责和权限，对不符合进行处理与调查，采取措施减少由此产生的影响，采取纠正与预防措施并予完成。 任何旨在消除已存在和潜在不符合的原因的纠正或预防措施，应与该问题的严重性和伴随的环境影响相适应。 对于纠正与预防措施所引起对程序文件的任何更改，组织均应遵照实施并予以记录。4.5.3 记录 组织应建立并保持一套程序，用来标识、保存与处置有关环境管理的记录。这些记录中还应包括培训记录和审核与评审结果。 环境记录应字迹清楚，标识明确，具备对相关活动、产品或服务的可追溯性。对环境记录的保存和管理应使之便于查阅，避免损坏、变质或遗失。应规定其保存期限并予记录。 组织应保存记录，在对其体系及自身适宜时，用来证明符合本标准的要求。4.5.4 环境管理体系审核 组织应制定并保持用于定期开展环境管理体系审核的一个或多个方案和一些程序，进行审核的目的是： a) 判定环境管理体系： 1)是否符合对环境管理工作的预定安排和本标准的要求； 2)是否得到了正确的实施和保持。 b) 向管理者报送审核结果。 组织的审核方案（包括时间表）的制定，应立足于所涉及活动的环境重要性和以前审核的结果。为全面起见，审核程序中应包括审核的范围、频次和方法，以及实施审核和报告结果的职责与要求。4.6 管理评审 组织的最高管理者应按其规定的时间间隔，对环境管理体系进行评审，以确保体系的持续适用性、充分性和有效性。管理评审过程应确保收集必要的信息，以供管理者进行评价工作。评审工作应形成文件。 管理评审应根据环境管理体系审核的结果、不断变化的客观环境和持续改进的承诺，指出对方针、目标以及环境管理体系的其他要素加以修正的可能的需要。附录A（提示的附录）规范使用指南本附录对“要求”作了进一步说明，以防止对“规范”的错误解释。本附录仅涉及第4章中所述的关于“要求”的内容。 A1 总要求 实施“规范”所规定的环境管理体系的目的，是改进环境表现（行为）。“规范”立足于这样一个基本概念，即组织将定期评审与评价其环境管理体系，以寻求对它进行改进的可能性并予以实施。而对环境管理体系的改进，是为了实现环境表现（行为）的进一步改进。 环境管理体系为持续改进的实现提供了一个结构化的过程，改进的程度和范围由组织根据其经济状况和其他客观条件自行决定。尽管可以期望通过采用系统化的方法，实现环境表现（行为）上的某些改进，但应当认识到，环境管理体系毕竟只是一种工具，其作用是帮助组织去实现和系统地控制它自己设定的环境表现（行为）水准。环境管理体系的建立与运行，本身并不必然地导致立即降低有害环境影响的结果。 是在整个组织内，还是仅在一些特定的工作部门或活动中实施本标准，可由组织自行决定。如果仅在特定的工作部门或活动中实施，可以采纳组织内其他部分业已建立的方针和程序，用来满足本标准的要求，只要它们适用于行将采用本标准的这些特定部门或活动。环境管理体系的详尽与复杂程度，文件提供的程度，支持体系运行的资源，都取决于组织的规模及其所从事活动的性质，对于中小型企业尤其如此。 把环境事务纳入整个管理体系，将有助于环境管理体系的有效实施，同时有助于提高效能，明确责任。 本标准规定的管理体系要求，是建立在一个由“计划（策划）、实施、检查、评审”诸环节构成的动态循环过程的基础上。 该体系应使组织能够： a) 制定适宜的环境方针； b) 确定其过去、当前或计划的活动、产品或服务中的环境因素，以判定其中的重大环境影响； c) 确定有关的法律、法规要求； d) 确定优先事项，建立适当的环境目标和指标； e) 建立组织机构，制定方案，以实施环境方针，实现环境目标和指标； f) 顺利开展规划（策划）、控制、监测、纠正措施、审核与评审活动，以确保对环境方针的遵循和环境管理体系的持续适宜性。 g) 根据不断变化的客观条件作出修正。A2 环境方针 环境方针是实施与改进组织的环境管理体系的推动力，具有保持和潜在改进环境表现（行为）的作用。因此，环境方针须反映最高管理者对遵循有关法律和保证持续改进的承诺。环境方针是组织建立目标和指标的基础。对方针的规定应当作到意义明确，使内、外相关方都易于理解。应当对方针进行定期评审与修订，以反映不断变化的条件和信息。方针的应用范围应当是可以明确界定的。 组织的最高管理者应规定其环境方针并将其形成文件。如果它从属于一个更大的组织，其环境方针还应符合后者的方针，并得到后者的认可。 注：最高管理者可以是对组织负有执行职责的个人或集体。 A3 规划（策划） A3.1环境因素 4.3.1提供了一个过程，组织可据此确定哪些重要环境因素应作为其的环境管理体系的优先事项。该过程应考虑到分析工作的费用和时间，以及可靠数据的可得性。可以利用出于法规或其他目的所取得的现有信息。组织还可以把他们所关心的环境因素的实际控制程度也纳入考虑范围。组织应当考虑其现行的，以及与此有关的过去的活动、产品和（或）服务所伴随的投入和产出，以确定自身的环境因素。 如果一个组织尚未建立环境管理体系，首先应当通过评审的方式来确定自己的环境状况，这样做的目的，是对组织所具有的一切环境因素予以考虑，以此作为建立环境管理体系的基础。 已实施环境管理体系的组织，可以不进行这一评审。 评审范围应覆盖下列四个关键方面： a) 法律、法规要求； b) 重要环境因素的确定； c) 对所有现行环境管理活动与程序的审查； d) 对来自以往事件调查的反馈意见的评价。 在所有情况下，都应当考虑到组织内的正常和异常运行条件，以及可能发生的紧急状态。 评审的适宜作法可包括使用调查表、面谈、直接检验和测量，利用以往审核或其他评审的结果等，应视活动性质而定。 应对涉及下列因素的工作部门的活动所伴随的重要环境因素的确定予以考虑： a) 向大气的排放； b) 向水体的排放； c) 废物管理； d) 土地污染； e) 原材料与自然资源的使用； f) 其他当地环境问题和社区性问题。 这一过程中应考虑到正常运行条件，关闭与启动时的条件，以及可合理预见的情况或紧急状态所伴随的潜在的重大环境影响。 这一过程的目的在于确定与活动，产品或服务所伴随的重大环境影响，而不要求作具体的生命周期评价。组织无须对它的每一种产品、部件和原材料投入都作出评价。他们可以从活动、产品或服务中选择出某些属类，从中确定那些最可能具有重大环境影响的因素。 对产品环境因素的控制和影响，因组织所面临的市场情况不同而有很大的差异。相对说来，组织的承包方或供方的控制作用较微弱，而由于组织负责产品的设计，它能通过这一过程明显地改变环境因素，如通过更换某种输入材料。考虑到组织在他们产品的使用和处置过程中控制作用有限，在可行时，他们应考虑建立适当的贮运与处置机制。但这一规定不意味着改变或增加组织的法律责任。A3.2法律与其他要求 组织应遵守的其他要求示例： a) 行业规范； b) 与有关机构的协定； c) 非法规性指南。 A3.3 目标和指标 凡属可行，目标均应具体，指标均应可测量，必要时应将预防措施考虑在内。 对技术的选择，可根据自身的经济条件，考虑选用效益高、成本低。适于应用的最佳可行技术。 正文中提及对组织的财务要求，不意味着组织必须采取环境成本核算。A3.4 环境管理方案 制定与执行一个或多个方案是成功实施环境管理体系的一个关键要素。方案中应说明如何实现组织的环境目标和指标，包括时间进度和负责实施环境方针的人员。方案可予细化，具体到组织运行的基本要素。方案中应包括对新活动的环境评审。 在适当和可行时，无论对现行还是新增的活动、产品或服务，方案中可包括对计划设计、生产，营销和处置的考虑。对于产品，可从设计、材料、加工、使用及最终处置等方面进行考虑。对于安装工作或工艺上的重大修改，可从计划、设计、施工、试运行、运行，以及根据组织决定的适当时间予以关闭等方面考虑。A4 实施与运行 A4.1 组织结构和职责 环境管理体系的成功实施需要组织内全体员工的承诺。因此，不能认为环境上职责仅限于环境职能部门，事实上，组织内的其他部门，如运行管理部门，人事部门等，也可以有这方面责任。 这一承诺始于最高管理者，他（们）应制定组织的环境方针并确保环境管理体系的实施。作为上述承诺的一部分，是指定专门的管理者代表，规定他（们）对实施环境管理体系的职责和权限。对于大型或复杂的组织，可以有不止一个管理者代表。对于中、小型企业，可由一个人承担这些职责。最高管理者还应确保提供环境管理体系的实施与保持所需的适当的资源。另一重要事项是妥善规定环境管理体系的关键职责，并落实到有关人员。A4.2 培训、意识和能力 组织应建立并保持一套确定培训需求的程序。同时，它还应要求代表它工作的承包方证实其员工接受过必要的培训。 管理者应对确保人员胜任性（特别是行使环境管理职能的人员）所需的经验、能力和培训水平予以确定。A4.3 信息交流 组织应实施对有关信息和相关方要求的接受、归档与答复的程序。该程序可包括与相关方的对话和对他们所关注的问题的考虑。在某些情祝下，对相关方所关注事务的答复中，可包含有关组织运行所造成的环境影响的内容。这些程序中，还应包含就应急计划和其他问题与官方机构的联络事宜。A4.4 环境管理体系文件 文件内容应足够详尽，以充分描述环境管理体系的核心要素，以及它们之间的相互作用的情况。同时，还应能指示出获取关于环境管理体系中具体运行部分的更详细信息的途径。可将环境文件纳入组织实施的其他体系的文件。不强求编制专门手册。有关文件应包括: a) 过程信息； b) 组织机构图； c) 内部标准与运行程序； d) 现场应急计划。A4.5 文件控制 4.4.5旨在确保组织对文件的建立与保持能够充分适应实施环境管理体系的需要。但组织应将主要注意力放在环境管理体系的有效实施及其环境表现（行为）上，而不应过分追求一个繁琐的文件控制系统。A4.6 运行控制 将来修订时可能会增添这方面的内容。A4.7 应急准备和响应 将来修订时可能会增添这方面的内容。A5 检查与纠正措施 A5.1 监测和测量 将来修订时可能会增添这方面的内容。A5.2 不符合、纠正和预防措施 组织在制定与保持用于调查与纠正不符合的程序时，应包含下列基本内容： a) 确定引起不符合的原因； b) 确定并实行必要的纠正措施； c) 实施或修改必要的控制措施，以防再度发生不符合； d) 记录由纠正措施所导致的对书面程序的任何更改。 根据情况的不同，有时纠正措施可能只需略为计划，并能迅速见效，但有时可能是一项复杂、长期的活动。相应的文件应与纠正措施的规模相适配。A5.3 记录 用来标识、保持与处置记录的程序，应将重点放在那些为实施与运行环境管理体系所需的和关于环境目标和指标实现程度的记录上。 环境记录可包括： a) 关于适用的环境法律与其他要求的信息； b) 投诉记录； c) 培训记录； d) 过程信息； e) 产品信息； f) 检查、维护与校准记录； g) 有关的供方与承包方信息； h) 事故报告； i) 应急准备与响应信息； j) 重要环境因素信息； k) 审核结果 l)管理评审。 应对机密业务信息的管理给以适当考虑。A5.4 环境管理体系审核 审核方案与程序应包括： a) 待审核的活动与区域； b) 审核的频次； c) 管理与实施审核的职责； d) 审核结果的通报； e) 审核员的能力； f) 如何实施审核。 审核工作可由组织内部人员或组织聘请的外部人员承担，无论哪种情况，从事审核的人员都应做到公正，客观。A6 管理评审 为了保持环境管理体系的持续改进、适用性和有效性，从而取得良好的环境表现（行为）。组织的管理者应按规定的时间间隔对环境管理体系进行评审与评价。评审范围应当全面，但不必在一次评审中涉及环境管理体系的所有要素，同时评审过程可以延续一段时间。 对方针、目标与程序的评审，应由制定它们的相应管理层承担。 评审内容应包括： a) 审核结果； b) 目标和指标的实现程度； c) 面对变化的条件与信息，环境管理体系是否具有持续的适用性； d) 相关方关注的问题。 观察结果、结论与建议应形成文件，以便采取必要的措施。文献目录1. GB/T240041996，环境管理体系 原则、体系和支持技术通用指南 2. GB/T240101996，环境审核指南 通用原则 3. GB/T240111996，环境审核指南 审核程序 环境管理体系审核 4. GB/T240121996，环境审核指南 环境审核员资格要求Square and Hex Nuts (Inch Series) ASMEIANSI B1 8.2.2-1 987 REAFFIRMED 1993 FOR CURRENT COMMITIEE PERSONNEL PLEASE SEE ASME MANUAL AS-1 1 SPONSORED AND PUBLISHED BY T H E A M E R I C A N S O C I - E T Y O F M E C H A N I C A L E N G I N E E R S United Engineering Center 345 East 47th Street New York, N. Y. 1 O0 17 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,Date of Issuance: August 15,1987 This Standard will be revised when the Society approves the issuance o f a new edition. There will be no addenda or written interpretations of the requirements o f this Standard issued to this edition. This code or standard was developed under procedures accredited as meeting the criteria for American National Standards. The Consensus Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The proposed code or standard was made available for pub!ic review and comment which provides an opportunity for additional public input from industry, academia, regulatory agencies, and the public-at-large. ASME does not approve, rate, or endorse any item, construction, proprietary device, or activity. ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable Letters Patent, nor assume any such liability. Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility. Participation by federal agency representativekd or personk) affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard. ASME accepts responsibility for only those interpretations issued in accordance with governing ASME procedures and policies which preclude the issuance of interpretations by individual volunteers. No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. Copyright 1987 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A. Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,STD*ASME B18.2-2-ENGL L987 0759b70 Ob119707 215 m FOREWORD (This Foreword is not part of ASME/ANSI B18.2.2-1987.) American National Standards Committee B18 for the standardization of bolts, screws, nuts, rivets, and similar fasteners was organized in March 1922 as Sectional Committee BI 8 under the aegis of the American Engineering Standards Committee (later the American Standards Association, then the United States of America Standards Institute and, as of October 6,1969, the American National Standards Institute, Inc.) with the Society of Auto- motive Engineers and the American Society of Mechanical Engineers as joint sponsors. Subcommittee 2 was subsequently established and charged with the responsibility for tech- nical content of standards covering wrench head bolts and nuts. Subcommittee 2, after appraisal of the requirements of industry, developed a proposed standard series of bolt head and nut dimensions. This proposal was finally approved and designated a Tentative American Standard in February 1927. A first revision of the document was designated as an American Standard in March 1933 and was followed by a second revision which was granted approval as an American Stan- dard in January 1941. Following reorganization of the B18 Committee in 1947, Subcommittee 2 was asked to expand the standard on head proportions into a complete product standard. A proposal covering square and hexagon head bolts and nuts, hexagon head cap screws, and automo- tive hexagon head bolts was prepared and submitted to the B18 Committee in April 1950. While this draft was under consideration, the B18 Committee received a proposal from the British Standards Institution for Unification of dimensions on products incorporating uni- fied screw threads. The Committee welcomed the opportunity of discussing the proposals and an American-British-Canadian Conference was held in New York on June 1 and 2, 1950. It was agreed in the conference that the essentials of unification could be accomplished by selection of mutually satisfactory across-the-flats dimensions, since this would permit the use of the same wrenches and because other features would rarely affect interchangeability. After due consideration, suitable existing across-the-flats dimensions were selected for the hexagon products affected. In its meeting of October 13,1950, Subcommittee 2 agreed to incorporate in the proposed standard the conference recommendations on y 4 in. hexagon head bolts, 7 8 in. hexagon head cap screws and automotive hexagon head bolts, YI6 in. and y 8 in. regular hexagon and square nuts, and 1/16 in. light and regular hexagon and square nuts. At a subsequent meeting of Subcommittee 2, further changes were adopted in order to combine the light and regular series of nuts, and to combine the automotive hexagon head bolt, hexagon head cap screw, and regular hexagon head close tolerance bolt. In view of the prgress made in the United States and the urgency of standardization for mutual defense, the British Standards Institution sponsored a second Conference in Lon- don in April 1951 to complete the unification of certain hexagon bolts and nuts. At a meeting on June 8, 1951, Subcommittee 2 reaffirmed its acceptance of the unified di- mensions which correspond with those in the March 1951 draft, but attempted to select bet- ter nomenclature for the unified products. A final draft incorporating the nomenclature iii Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,“Finished Hexagon Bolts and Nuts” and containing numerous editorial changes was sub- mitted for letter ballot in September 1951. Following approval by the B18 committee and the sponsors, the proposal was presented to the American Standards Association for ap- proval and designation as an American Standard. This was granted on March 24, 1952. It being recognized that the standard was in need of additional refinements, Subcommit- tee 2 began work immediately to eliminate these shortcomings. A proposed revision remov- ing inconsistencies with respect to fillets, improving the length tolerances on heavy hexagon bolts, and incorporating numerous other corrections and clarifications of an editorial nat- ure, resulted. The most noteworthy editorial change was a decision to combine the coverage for hexagon cap screws and square head set screws from the B18.2 standard with the cover- age for slotted head cap screws and slotted headless set screws from the B18.6 standard for publication in a separate document. The requirements for the unified hexagon cap screws and finished hexagon bolts being identical in the overlapping sizes, the data would now be available in two publications. Following approvals by the B18 Committee and sponsor or- ganizations, the proposal was submitted to the American Standards Association and de- clared an American Standard on February 2, 1955. A revision of this document comprised of numerous editorial corrections and inclusion of an appendix for grade markings was duly approved and designated an American Stan- dard on April 18, 1960. At a meeting in February 1960, Subcommittee 2 approved a recommendation to reduce the head heights for heavy, heavy semi-finished, and heavy finished hexagon bolts which was subsequently approved by letter ballot of the B18 Committee on August 16, 1960. A proposed standard for heavy hexagon structural bolts submitted and accepted by Subcom- mittee 2 at its October 17, 1960 meeting was approved by letter ballot of the B18 Committee on May 9, 1961, To meet the urgent needs of the steel construction industry it was consid- ered necessary to publish the standard for the structural bolts immediately. Consequently, Appendix IV to ASA B18.2-1960 containing coverage for the revised heavy hexagon bolts and the new heavy hexagon structural bolts was released in 1962. In October of. 1961, Subcommittee 2 appointed a subgroup to review all product stan- dards for square and hexagon bolts, screws, and nuts, and to recommend simplifications which would be compatible with technical, production, and distribution advances that had occurred over the prior several years. The subgroup presented its recommendations at a meeting of Subcommittee 2 in October of 1962. It being agreed that the internally and exter- nally threaded products should be published in separate documents as suggested, draft pro- posals for each were completed. The proposed revision for square and hex nuts incorporated the following subgroup rec- ommendations: discontinuation of regular semi-finished nuts; elimination of regular hexa- gon and heavy hexagon nuts in sizes ! 4 in. through 1 in.; elimination of finished hexagon nuts in sizes larger than 1 /z in.; elimination of the washer face semi-finished style on fin- ished series nuts in sizes % in. and smaller and heavy series nuts in sizes 7/16 in. and smaller; removal of machine screw nuts (these nuts now contained in B18.6.3); and adoption of an abbreviated product nomenclature. Letter ballot of this proposal to the B18 Committee re- sulted in approval. Following acceptance by the sponsor organizations the revision was sub- mitted to the American Standards Association and designated ASA B1 8.2.2 on September 8, 1965. Subcommittee 2 continued to further develop refinements initiated by the simplification subgroup and study changes suggested by consumer interests. This work culminated in Sub- committee acceptance of a 1970 proposal incorporating, in addition to numerous editorial changes, revisions to the requirements on angularity of bearing face and countersink diame- ters for the various hex nuts and heavy hex nuts, and inclusion of an appendix covering the gaging of slots in slotted nuts. The proposed revision, after approval by letter ballot of the B18 Committee in March 1970, was subsequently approved by the sponsors and submitted iv Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,to the American National Standards Institute for designation as an American National Standard. This was granted on January 18, 1972. A proposed revision of the standard agreed upon by Subcommittee 2 incorporated a pro- vision to enable consumers to specify heavy hex nuts and heavy hex jam nuts with close bearing face angularity, when required; clarified intent with regard to width across flats on nuts produced from bar stock; deleted coverage for hex castle nuts from the appendices; and included numerous editorial refinements. This proposal was formally approved by let- ter ballot of the subcommittee and the B18 Committee. Following its acceptance by the sponsor organizations the revision was referred to the American National Standards Insti- tute and granted recognition as an American National Standard on February 27, 1987. V Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,ASME STANDARDS COMMITTEE B18 Standardization of Bolts, Nuts, Rivets, Screws, Washers, and Similar Fasteners (The following is the roster of the Committee at the time of approval of this Standard.) OFFICERS J. B. Levy, Chairman H. W. Ellison, Vice Chairman E . Schwartz, Vice Chairman R. W. McGinnis, Secretary COMMITTEE PERSONNEL AMERICAN SOCIETY OF AGRICULTURAL ENGINEERS E. R. Friesth, Don E. Williams Co., Rock Island. Illinois AMERICAN SOCIETY OF MECHANICAL ENGINEERS A. R. Machell, Webster, New York K. E. McCullough, SPS Technologies Inc., Jenkintown, Pennsylvania ENGINE MANUFACTURERS ASSOCIATION G. A. Russ, Cummins Engine Co., Columbus, Indiana FARM & INDUSTRIAL EQUIPMENT INSTITUTE D. A. Clever, Deere & Co., Moline, Illinois HAND TOOL INSTITUTE R. B. Wright, Wright Tool Co., Barberton, Ohio INDUSTRIAL FASTENERS INSTITUTE D. J. Broomfield, Illinois Tool Works Inc., Elgin, Illinois O. A. Garrison, Russell, Burdsall & Ward Corp., Rock Falls, Illinois R. M. Harris, Bethlehem Steel Corp., Lebanon, Pennsylvania D. Lidl. Greensburg, Pennsylvania J. C. McMurray, Alternate, Russell, Burdsall & Ward Inc., Cleveland, Ohio J. S. Orlando, Chicago, Illinois E. Sterling, Emhart Corp., Campbellsville, Kentucky J. A. Trilling, Holo-Krome Co., West Hartford, Connecticut S. W. Vas. Lake Erie Screw Corp., Cleveland, Ohio C. J. WJson, Industrial Fasteners Institute, Cleveland, Ohio METAL CUTTING TOOL INSTITUTE D. Emanuelli, TRW - Greenfield Tap & Die, Greenfield, Massachusetts NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION J. B. Levy, Scotia, New York W, F. Montavon, Alternate, National Electrical Manufacturers Association, Washington, D.C. F. F. Weingruber, Westinghouse Electric Corp., Pittsburgh, Pennsylvania NATIONAL FASTENERS DISTRIBUTORS ASSOCIATION J. F. Sullivan, Accurate Fasteners, Inc., South Boston, Massachusetts vii Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,SOCIETY OF AUTOMOTIVE ENGINEERS H. W. Ellison, General Motors Corp., Warren, Michigan R. S. Piotrowski, Mack Trucks Inc., Allentown, Pennsylvania TUBULAR & MACHINE INSTITUTE R. M. Byme. Trade Association Management Inc., Tarrytown, New York J. G. Zeratsky, National Rivet & Manufacturing Co., Waupun, Wisconsin U. S. DEPARTMENT OF THE ARMY M. E. Taylor, U. S. Army Armament, Munitions & Chemical Command, Dover, New Jersey A. Herskovitz, Alternate, U. S . Army Armament, Munitions & Chemical Command, Dover, New Jersey J. E. Long, Alternate, U. S. Army Tank Command, Warren, Michigan U. S. DEPARTMENT OF DEFENSE E. Schwartz, Defense Industrial Supply Center, Philadelphia, Pennsylvania L. Pieninck, Alternate, Defense Industrial Supply Center, Philadelphia, Pennsylvania U. S. DEPARTMENT OF THE NAVY J. E. Hass, Department of the Navy, Washington, D.C. M. S. Orysh, Alternate, Department of the Navy, Philadelphia, Pennsylvania INDIVIDUAL MEMBERS A. R. Breed, Lakewood, Ohio R. A. Flor, Chrysler Corp., Detroit, Michigan G. A. Gobb, Ford Motor Co., Dearborn, Michigan F. E. Graves, F. E. Graves Assoc., Fairfield, Connecticut J. J. Naesset. Clark Equipment Co., Battle Creek, Michigan SUBCOMMITTEE 2 - SQUARE AND HEX BOLTS AND NUTS S. C. Adamek, Pheoll Mfg. Co., Chicago, Illinois A. R. Breed, Lakewood, Ohio R. M. Byme. Tarrytown, New York D. A. Clever, Deere & Co., Moline, Illinois W. J. Demer, FMC Corp., Indianapolis, Indiana D. A. Garrison, Russell, Burdsall &Ward Corp., Rock Falls, Illinois F. E. Graves, Fairfield, Connecticut R. M. Hams, Bethlehem Steel Corp., Lebanon, Pennsylvania J. B. Levy, Scotia, New York A. R. Machell, Webster, New York K. E. McCullough, SPS Technologies, Jenkintown. Pennsylvania J. C. McMurray, Russell, Burdsall &Ward Corp., Cleveland, Ohio A. Nebesny, Alternate, FMC Corp., Indianapolis, Indiana I. M. Park, Stelco Wire Products, Ontario, Canada L. Pieninck, Alternate, Defense Industrial Supply Center, Philadelphia, Pennsylvania R. L. Tennis, Caterpillar Tractor Co., Peoria, Illinois S. W. Vass. Lake Erie Screw Corp., Cleveland, Ohio F. F. Weingruber, Westinghouse Electric Corp., Pittsburgh, Pennsylvania C. J. Wilson, Industrial Fasteners Institute, Cleveland, Ohio viii Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,CONTENTS . Foreword 111 Standards Committee Roster vii 1 Introductory Notes 1 2 General Data 1 Tables 1 Dimensions of Square Nuts 3 2 Dimensions of Hex Flat Nuts and Hex Flat Jam Nuts 5 3 Dimensions of Hex Nuts and Hex Jam Nuts 7 4 Dimensions of Hex Slotted Nuts 9 5 Dimensions of Hex Thick Nuts 11 6 Dimensions of Hex Thick Slotted Nuts 13 7 Dimensions of Heavy Square Nuts 15 8 Dimensions of Heavy Hex Flat Nuts and Heavy Hex Flat Jam Nuts 17 10 Dimensions of Heavy Hex Slotted Nuts 24 9 Dimensions of Heavy Hex Nuts and Heavy Hex Jam Nuts 20 Appendices I Slot Gages and Gaging for Slotted Nuts 27 II Formulas for Nut Dimensions 29 III Wrench Openings Applicable to Square and Hex Nuts 33 ix Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,ASME/ANSI 818.2.2-1987 SQUARE AND HEX NUTS (INCH SERIES) 1 INTRODUCTORY NOTES 1.1 Scope 1.1.1 This Standard is intended to cover the com- plete general and dimensional data for the various types of inch series square and hex nuts recognized as “American National Standard.” Also included are appendices covering gaging of slots in slotted nuts, wrench openings for nuts, and formulas on which di- mensional data are based. It should be understood, however, that where questions arise concerning ac- ceptance of product, the dimensions in the Tables shall govern over recalculation by formula. 1.1.2 The inclusion of dimensional data in this Standard is not intended to imply that all of the prod- ucts described herein are stock production sizes. Con- sumers are requested to consult with manufacturers concerning lists of stock production sizes. 1.2 Dimensions All dimensions in this Standard are in inches, unless stated otherwise. 1.3 Options Options, where specified, shall be at the discretion of the manufacturer unless otherwise agreed upon by the manufacturer and the purchaser. 1.4 Terminology For definitions of terms relating to fasteners or component features thereof used in this standard, re- fer to ANSI B1 8.12, Glossary of Terms for Mechani- cal Fasteners. 1.5 Referenced Standards Copies of referenced ASTM standards may be ob- tained from ASTM, 1916 Race Street, Philadelphia, Pennsylvania 19103. Copies of referenced SAE standards may be ob- tained from the Society of Automotive Engineers, Inc., 400 Commonwealth Drive, Warrendale, PA 15096 2 GENERAL DATA 2.1 Width Across Flats The width across flats of nut shall be the distance measured, perpendicular to the axis of nut, overall be- tween two opposite sides of the nut in accordance with the notes on respective dimensional tables. For milled- from-bar hex nuts, the nominal bar size used shall be the closest commercially available size to the specified basic width across flats of the nut. For milled-from- bar nonferrous nuts, the tabulated maximum (basic) width acrws flats dimensions may be exceeded to con- form with the commercial tolerances of drawn or rolled bar stock material. 2.2 Nut Thickness The nut thickness shall be the overall distance, mea- sured parallel to the axis of nut, from the top of the nut to the bearing surface and shall include the thick- ness of the washer face where provided. 2.3 Threads Threads shall be Unified Standard, Class 2B, of the series specified in the notes on respective dimensional tables, in accordance with Unified Inch Screw Threads (UN and UNR Thread Form), ANSI B1. l. 2.3.1 Thread Gaging. Unless otherwise specified by the purchaser, gaging for screw thread dimensional acceptability shall be in accordance with Gaging Sys- tem 21 as specified in ANSVASME B1.3MY Screw Thread Gaging Systems for Dimensional Acceptabil- ity. Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,ASME/ANSI 618.2.2-1987 SQUARE AND HEX NUTS (INCH SERIES) 2.4 Finish Unless otherwise specified, nuts shall be supplied with a natural (as-processed) finish, unplated or un- coated. 2.5 Workmanship Nuts shall be free from burrs, seams, laps, loose scale, irregular surfaces, and any defects affecting their serviceability. 2.6 Designation Nuts shall be designated by the following data in the sequence shown: nominal size (fraction or decimal); threads per inch; product name; material (including specification, where necessary); protective finish, if required. EXAMPLES: V z - 13 Square Nut, Steel, Zinc Plated 314 - 16 Hex Nut, SAE J995 Grade 5, Steel 1 . O 0 0 - 8 Hex Thick Slotted Nut, ASTM F594 (Alloy Group 1) Corrosion Resistant Steel 2 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,SQUARE AND HEX NUTS (INCH SERIES) F G 1 V Nominal Size or Basic Major Diarn. of Thread 0.2500 511 fi 0.31 25 318 0.3750 711 6 0.4375 h 0.5000 3/4 0.7500 =la 0.6250 718 0.8750 1 1 .o000 1 Is 1.1250 1 Ys 1.3750 1 h l . 5000 1 1.2500 See Note r1 25 deg. approx. 25 deg. approx Optional TABLE 1 DIMENSIONS OF SQUARE NUTS F Width Across Flats Basic Min. Max. 711 fi 0.625 H 0.547 0.562 911 fi 0.425 0.438 0.728 0.750 % 0.606 1 311 6 0.812 0.788 1 1 .o00 0.969 1 Is 1.269 1.312 15/16 1 .O88 1.125 1 112 1.500 1.450 l V 1 6 1.688 1.631 1 7 1 1.875 1.812 21/16 2.062 1.994 2% 2.175 2.250 1 ASME/ANSI 618.2.2-1987 G Width Across Corners Max. 0.619 0.795 0.884 1 .O61 1.149 1.414 1.591 1.856 2.121 2.386 2.652 2.917 3.182 Min. 0.554 0.721 0.802 0.970 1 .O52 1.300 1.464 1.712 1.961 2.209 2.458 2.708 2.956 H Basic Thickness Max. Min. 0.235 0.203 0.283 0.310 0.346 0.249 0.356 0.394 0.458 0.418 0.569 0.525 0.680 0.632 0.792 0.740 0.903 0.847 1 .O30 0.970 1.126 1 .O62 1.237 1.169 1.348 1.276 (For additional requirements refer to Notes on p. 4 and General Data on pp. 1 and 2.) 3 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,ASME/ANSI 818.2.2-1987 TABLE 1 (CONTD) GENERAL NOTES: SQUARE AND HEX NUTS (INCH SERIES) Unification. Bolt type indicates products unified dimensionally with British and Cana- dian standards. Tops of Nuts. Tops of nuts shall be flat and chamfered or washer crowned. Diameter of the chamfer circle shall be equal to the maximum width across flats within a toler- ance of - 15%. The surface of the chamfer may be slightly convex or rounded. Bearing Surface. Bearing surface shall be perpendicular to the axis of the threaded hole within a tolerance of 3 deg. for 1 in. nominal size nuts or smaller, and 2 deg. for nuts larger than 1 in. True Position of Tapped Hole. The axis of tapped hole shall be located at true position . with respect to the axis of nut body within a tolerance zone having a diameter equiva- lent to 10% of the maximum width across flats, regardless of feature size. Threads. Threads shall be unified coarse thread series (UNC series), Class 28. Material. Unless otherwise specified, chemical and mechanical properties of steel nuts shall conform with Grade A of ASTM A 563, Carbon and Alloy Steel Nuts. Nuts of other materials such as corrosion resistant (stainless) steel, brass, bronze, and alumi- num alloys shall have properties as agreed upon between the manufacturer and pur- chaser. The properties for nuts of several grades of corrosion resistant steel alloys are covered in ASTM F 594, and of several nonferrous materials in ASTM F 467. NOTE: (1 ) Width Across Flats. Maximum width across flats shall not be exceeded (see excep- tion in General Data). No transverse section through the nut between 25% and 75% of the actual nut thickness as measured from the bearing surface shall be less than the minimum width across flats. 4 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,SQUARE AND HEX NUTS (INCH SERIES) ASME/ANSI 618.2.2-1987 TABLE 2 DIMENSIONS OF HEX FLAT NUTS AND HEX FLAT JAM NUTS I F I G I H I Hl Nominal Size Thickness Thickness Width Across Width Across or Min. Max. Basic Mm. Max. Basic Min. Max. Min. Max. Basic of Thread Hex Fiat Jam Nuts Hex Flat Nuts Corners Flats 1% 1.1250 11%6 1.688 0.839 0.91 1 18 1.276 1.348 16/16 2.480 2.598 2.175 2.250 2% 1112 1.5000 0.778 0.846 1.169 1.237 1% 2.273 2.382 1.994 2.062 2%6 1% 1.3750 0.718 0.782 v 4 1.062 1.126 1732 2.066 2.165 1.812 1.875 1% l/a 1.2500 0.595 0.655 % 0.970 1.030 1 1.859 1.949 1.631 Basic Major Diam. See Notes 1 2 (For additional requirements refer to Notes on p. 6 and General Data on pp. 7 and 2.1 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,ASMElANSl 818.2.2-1987 SQUARE AND HEX NUTS (INCH SERIES) TABLE 2 (CONTD) GENERAL NOTES: (a) Unification. Bold type indicates products unified dimensionally with British and Cana- dian standards. (b) Smaller Sizes. For sizes /4 in. through 1 in., the nuts specified in Table 3 are recom- (c) Tops of Nuts. Tops of nuts shall be flat and chamfered. Diameter of the chamfer circle shall be equal to the maximum width across flats within a tolerance of - 15%. The length of chamfer at hex corners shall be from 5% to 1 5% of the basic thread diame- ter. The surface of chamfer may be slightly convex or rounded. (dl Bearing Surface. Bearing surface shall be flat and perpendicular to the axis of the threaded hole within a tolerance of 2 deg. (e) True Position of Tapped Hole. The axis of tapped hole shall be located at true position with respect to the axis of nut body within a tolerance zone having a diameter equiva- lent to 4% of the maximum width across flats, regardless of feature size. (f) Threads. Threads shall be unified coarse thread series (UNC series), Class 26. (g) Material. Unless otherwise specified, chemical and mechanical properties of steel nuts shall conform with Grade A of ASTM A 563, Carbon and Alloy Steel Nuts. Nuts of other materials such as corrosion resistant (stainless) steel, brass, bronze, and alu- minum alloys shall have properties as agreed upon between the manufacturer and purchaser. The properties for nuts of several grades of corrosion resistant steel alloys are covered in ASTM F 594, and of several nonferrous materials in ASTM F 467. mended. NOTES: (1 1 Width Across Flats. Maximum width across flats shall not be exceeded (see excep- tion in General Data). No transverse section through the nut between 25% and 75% of the actual nut thickness as measured from the bearing surface shall be less than the minimum width across flats. For milled-from-bar nuts, see statement in General Data pertaining to the nominal bar size to be used. (21 Corner Fill. A rounding or lack of fill at junction of hex corners with chamfer shall be permissible provided the width across corners is within specified limits at and beyond a distance equal to 17.5% of the basic thread diameter from the chamfered face. 6 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,0.016 in. approx. H i-1 El TABLE 3 DIMENSIONS OF HEX NUTS AND HEX JAM NUTS F G Runout of Bearing Face FIM Hex Nuts Specified Proof Load Hex Jam Nuts up to 150,000 All 150,000 psi and Strength Psi Greater Levels H Thickness Thickness Hex Nuts Hex Jam Nuts Width Across Flats Nominal Sire -J OI Basic Major Diam. of Thread - I4 02500 %a 0.3125 % 0.3750 II6 0.4375 Basic Max. ll16 0.438 I2 0.500 9116 0.562 “116 0.688 Min. - 0.428 0.489 0.551 0.675 Width Across Corners - Max. Min. - 0.505 0.488 0.577 0.557 0.650 0.628 0.794 0.768 I2 0.5000 314 0.750 0.736 0.866 0.840 YlS 0.5625 r/s 0.875 0.861 1.010 0.982 % 0.6250 VI6 0.938 0.922 1.083 1.051 % 0.7500 1 I6 1.125 1.088 1.299 1.240 la 0.8750 1%6 1.312 1.269 1.516 1.447 1 1 la 1% 13/e 1 I2 See Notes 1 .oooo 1.1250 1.2500 1.3750 1.5000 1 I2 1.500 1.450 1”llR 1.688 1.631 1 Is 1.875 1.812 m6 2.062 1.994 2 I4 2,250 2.175 1.732 1.653 1.949 1.859 2.165 2.066 2.382 2.273 2.598 2.480 I_- - 1 2 Basic Max. - Min. Basic Max. Min. Max. I32 0.226 0.212 6132 0.163 0.150 I64 0.273 0.258 Yl a 0.195 0.180 2/ar 0.337 0.320 I32 0.227 0.210 Ya 0.385 0.365 14 0.260 0.240 - 0.01 5 0.016 0.017 0.018 0.010 0.015 0.011 0.016 0.012 0.017 0.013 0.018 %s 3164 =-I64 “I64 k 66164 3132 1 Its 1 (la4 1 s/X? - 0.448 0.427 VI 5 0.323 0.302 0.019 0.014 0.019 0.496 0.473 =I1 6 0.324 0.301 0.020 0.015 0.020 0.559 0.535 Va 0.387 0.363 0.021 0.016 0.021 0.665 0.617 27164 0.446 0.398 0.023 0.018 0.023 0.776 0.724 3 I64 0.510 0.458 0.025 0.020 0.025 0.887 0.831 35l64 0.575 0.999 0.939 =164 0.639 1.094 1.030 %2 0.751 1.206 1.138 -%2 0815 1.317 1.245 27i32 0.889 0.519 0.579 0.687 0.747 0.808 ._.- 0.027 0.022 0.030 0.025 0.033 0.028 0.036 0.031 0.039 0.034 - - 0.027 0.030 0.033 0.036 0.039 3 /For additional requirements refer to Notes on p. 8 and General Data on pp. 1 and 2.j Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,ASME/ANSI B18.2.2-1987 TABLE 3 ICONTD) GENERAL NOTES: SQUARE AND HEX NUTS (INCH SERIES) Unification. Bold type indicates products unified dimensionally with British and Cana- dian standards. Unification of fine thread nuts is limited to sizes l in. and smaller. True Position of Tapped Hole. The axis of tapped hole shall be located at true position with respect to the axis of nut body within a tolerance zone having a diameter equiva- lent to 4% of the maximum width across flats, regardless of feature size. Countersink. Tapped hole shall be countersunk on the bearing face or faces. The max- imum countersink diameter shall be the thread basic (nominal) major diameter plus 0.030 in. for 3/8 in. nominal size nuts and smaller, and 1 .O8 times the basic major diameter for nuts larger than 3/8 in. No part of the threaded portion shall project be- yond the bearing surface. Threads. Threads shall be unified coarse, fine, or 8 thread series (UNC, UNF or 8 UN series), Class 28. Material. Unless otherwise specified, chemical and mechanical properties of steel nuts shall conform with Grade A of ASTM A 563, Carbon and Alloy Steel Nuts; or Grade 2 of SAE J995, Mechanical and Material Requirements for Steel Nuts. Nuts of other materials such as corrosion resistant (stainless) steel, brass, bronze, and alumi- num alloys shall have properties as agreed upon between the manufacturer and pur- chaser. The properties for nuts of several grades of corrosion resistant steel alloys are covered in ASTM F 594, and of several nonferrous materials in the ASTM F 467. NOTES: Width Across Flats. Maximum width across flats shall not be exceeded (see excep- tion in General Data). No transverse action through the nut between 25% and 75% of the actual nut thickness as measured from the bearing surface shall be less than the minimum width across flats. For milled-from-bar nuts, see statement in General Data pertaining to the nominal bar size to be used. Corner Fill. A rounding or lack of fill at junction of hex corners with chamfer shall be permissible provided the width across corners is within specified limits a? and beyond a distance equal to 17.5% of the basic thread diameter from the chamfered faces. Tops and Bearing Surfaces of Nuts. Nuts in sizes 5/. in. nominal size and smaller shall be double chamfered. Larger size nuts shall be double chamfered or have washer faced bearing surface and chamfered top. The diameter of chamfer circle on double chamfered nuts and diameter of washer face shall be within the limits of the maximum width across flats and 95% of the mini- mum width across flats. The tops of washer faced nuts shall be flat and the diameter of chamfer circle shall be equal to the maximum width across flats within a tolerance of - 15%. The length of chamfer at hex corners shall be from 5% to 1 5% of the basic thread diameter. The surface of chamfer may be slightly convex or rounded. Bearing surfaces shall be flat and perpendicular to the axis of the threaded hole within the FIM limits specified for the respective nut type and strength level. 8 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,Nomlnal Size Wldth Across Width Across 01 Flats Corners W Basic Major Diem. of Thread 8dC Max. Min. Max. Min. Bask k 0.2500 %6 0.3125 % 0.3750 I18 0.4375 I2 0.5000 %s 0.5825 % 0.8250 % 0.7500 1 0.8750 1 1 Is 1 k 1318 I/2 See Notes 1 .oooo 1.1250 1.2500 1.3750 1.5000 F TABLE 4 DIMENSIONS OF HEX SLOTTED NUTS I16 0.438 0.428 0.506 0.488 I32 I2 0.500 0.489 0.577 0.557 I84 Y1e 0.582 0.551 0.850 0.828 2l64 I16 0.888 0.875 0.794 0.788 %I 314 0.750 0.738 0.886 0.840 he I0 0.875 0.881 1.010 0.982 %4 Y1s 0.938 0.922 1.083 1.051 %4 1 /a 1.125 1.088 1.299 1.240 %4 lhe 1.312 1.289 1.618 1.447 k 1 I2 1.500 1.450 1.732 1.853 %I4 1 “Its 1.888 1.831 1.949 1.859 3/32 1 Iis 1.875 1.812 2.185 2.088 1116 2vre 2.082 1.994 2.382 2.273 l”lO4 2% 2.250 2.176 2.598 2.480 19/a, 1 G 2 H T s Runout of Bearing Unslotted Width of Surface Thickness Thickness Slot FIM - Max. Min. Max. Min. Max. Min. Max. 0.228 0.212 0.14 0.12 0.10 0.07 0.015 0.273 0.258 0.18 0.18 0.12 0.09 0.016 0.337 0.320 0.21 0.19 0.15 0.12 0.017 0.385 0.365 0.23 0.21 0.15 0.12 0.018 0.448 0.427 0.29 0.27 0.18 0.15 0.019 0.498 0.473 0.31 0.29 0.18 0.15 0.020 0.559 0.535 0.34 0.32 0.24 0.18 0.021 0.685 0.817 0.40 0.38 0.24 0.18 0.023 0.778 0.724 0.52 0.49 0.24 0.18 0.025 0.887 0.831 0.59 0.58 0.30 0.24 0.027 0.999 0.939 0.84 0.61 0.33 0.24 0.030 1.094 1.030 0.70 0.67 0.40 0.31 0.033 1.208 1.138 0.82 0.78 0.40 0.31 0.036 1.317 1.245 0.88 0.82 0.48 0.37 0.039 3 3 4 (For additional requirements refer to Notes on p. 10 and General Data on pp. 1 and 2.) Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,7 ASME/ANSI 618.2.2-1987 SQUARE AND HEX NUTS (INCH SERIES) TABLE 4 (CONTD) GENERAL NOTES: Unification. Bold type indicates products unified dimensionally with British and Cana- dian standards. Unification of fine thread nuts is limited to sizes l in. and under. True Position of Tapped Hole. The axis of tapped hole shall be located at true position with respect to the axis of nut body within a tolerance zone having a diameter equiva- lent to 4% of the maximum width across flats, regardless of feature size. Countersink. Tapped hole shall be countersunk on the bearing face. The maximum countersink diameter shall be the thread basic (nominal) major diameter plus 0.030 in. for 3 / 8 in. nominal size nuts and smaller, and 1 .O8 times the basic major diameter for nuts larger than 3 / 8 in. No part of the threaded portion shall project beyond the bearing surface. Threads. Threads shall be unified coarse, fine, or 8 thread series (UNC, UNF or 8 UN series), Class 2B. Material. Unless otherwise specified, chemical and mechanical properties of steel nuts shall conform with Grade A of ASTM A 563, Carbon and Alloy Steel Nuts; or Grade 2 of SAE J995, Mechanical and Material Requirements for Steel Nuts. Nuts of other materials such as corrosion resistant (stainless) steel, brass, bronze, and alumi- num alloys shall have properties as agreed upon between the manufacturer and pur- chaser. The properties for nuts of several grades of corrosion resistant steel alloys are covered in ASTM F 594, and of several nonferrous materials in ASTM F 467. NOTES: Width Across Flats. Maximum width across flats shall not be exceeded (see excep- tion in General Data). No transverse section through the nut between 25% and 75% of the actual nut thickness as measured from the bearing surface shall be less than the minimum width across flats. For milled-from-bar nuts, see statement in General Data pertaining to the nominal bar size to be used. Corner Fill. A rounding or lack of fill at junction of hex corners with chamfer shall be permissible provided the width across corners is within specified limits at and beyond a distance equal to 17.5% of the basic thread diameter from the chamfered faces. Slots. Slots shall be normal to nut flats. Contour of bottom of slots shall be at manu- facturers option. Requirements for gaging slots are in Appendix I. Tops and Bearing Surfaces of Nuts. Nuts in sizes 5/8 in. nominal size and smaller shall be double chamfered. Larger size nuts shall be double chamfered or have washer faced bearing surface and chamfered top. The diameter of chamfer circle on double chamfered nuts and diameter of washer face shall be within the limits of the maximum width across flats and 95% of the mini- mum width across flats. The top of washer faced nuts shall be flat and the diameter of chamfer circle shall be equal to the maximum width across flats within a tolerance of - 1 5%. The length of chamfer at hex corners shall be from 5% to 15% of the basic thread diameter. The surface of chamfer may be slightly convex or rounded. Bearing surface shall be flat and perpendicular to the axis of the threaded hole within the specified FIM limit. 10 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,SQUARE AND HEX NUTS (INCH SERIES) Nommal Size Basic Major Diem. of Thread of V4 0.2500 S/i6 0.31 25 Va 0.3750 % S 0.4375 h 0.5000 % 0.6250 314 0.7500 1.9 0.8750 1 1 .oOOo 1% 1.1250 1% 1.2500 13/13 1.3750 1 v2 1.5000 116 0.5625 See Notes t-7 .0.016 in. awrox. TABLE 5 DIMENSIONS OF HEX THICK NUTS F 1 G I H W a Across Fb M a . 0.438 0.500 0.562 0.688 0.750 0.875 0.938 1.125 1.312 1.500 1.688 1.875 2.062 2.250 1 Mm. 0.428 0.489 0.551 0.675 0.736 0.861 0.922 1 .O88 1.269 1.450 1.631 1.812 1.994 2.175 ASMElANSl 618.2.2-1987 Max. 0.505 0.577 0.650 0.794 0.866 1 .o10 1 .O83 1.299 1.516 1.732 1.949 2.165 2.382 2.598 Mm. Basic 0.488 132 0.557 21/w 0.628 9 3 2 0.768 2914 0.840 %S 0.892 % a 1.051 2% 1.240 % 1.447 20/32 1.653 1 1.859 1% 2.066 1% 2.273 1% 2.480 1 1 1 2 Max. 0.288 0.336 0.41 5 0.463 0.573 0.621 0.731 0.827 0.922 1 .O1 8 1.176 1.272 1.399 1.526 Min. 0.274 0.320 0.398 0.444 0.552 0.598 0.706 0.798 0.890 0.982 1.136 1.228 1.351 1.474 lunout o f Bearing Face FIM specifkd Roof Load 2-jq-55 Greater Ma. 0.01 5 0.01 6 0.017 0.01 8 0.01 9 0.020 0.021 0.023 0.025 0.027 0.030 0.033 0.036 0.039 3 0.01 o 0.01 1 0.01 2 0.01 3 0.014 0.01 5 0.01 6 0.01 8 0.020 0.022 0.025 0.028 0.031 0.034 (For additional requirements refer to Notes on p. 12 and General Dete on pp. 1 and 2.1 11 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,ASME/ANSI 618.2.2-1987 SQUARE AND HEX NUTS (INCH SERIES) TABLE 5 (CONTD) GENERAL NOTES: (a) True Position of Tapped Hole. The axis of tapped hole shall be located at true position with respect to the axis of nut body within a tolerance zone having a diameter equiva- lent to 4% of the maximum width across flats, regardless of feature size. (b) Countersink. Tapped hole shall be countersunk on the bearing face or faces. The max- imum countersink diameter shall be the thread basic (nominal) major diameter plus 0.030 in. for 3 / 8 in. nominal sire nuts and smaller, and 1 .O8 times the basic major diameter for nuts larger than 3 / 8 in. No part of the threaded portion shall project be- yond the bearing surface. (c) Threads. Threads shall be unified coarse, fine, or 8 thread series (UNC, UNF or 8 UN series), Class 28. (d) Material. Unless otherwise specified, chemical and mechanical properties of steel nuts shall conform with Grade A of ASTM A 563, Carbon and Alloy Steel Nuts; or Grade 2 of SAE J995, Mechanical and Material Requirements for Steel Nuts. Nuts of other materials such as corrosion resistant (stainless) steel, brass, bronze, and alumi- num alloys shall have properties as agreed upon between the manufacturer and pur- chaser. The properties for nuts of several grades of corrosion resistant steel alloys are covered in ASTM F 594, and of several nonferrous materials in ASTM F 467. NOTES: (1 1 Width Across Flats. Maximum width across flats shall not be exceeded (see excep- tion in General Data). No transverse section through the nut between 25% and 75% of the actual nut thickness as measured from the bearing surface shall be less than the minimum width across flats. For milled-from-bar nuts, see statement in General Data pertaining to the nominal bar size to be used. (2) Corner Fill. A rounding or lack of fill at junction of hex corners with chamfer shall be permissible provided the width across corners is within specified limits at and beyond a distance equal to 17.5% of the basic thread diameter from the chamfered faces. (31 Tops and Bearing Surfaces of Nuts. Nuts in sizes in. nominal size and smaller shall be double chamfered. Larger sire nuts shall be double chamfered or have washer faced bearing surface and chamfered top. The diameter of chamfer circle on double chamfered nuts and diameter of washer face shall be within the limits of the maximum width across flats and 95% of the mini- mum width across flats. The tops of washer faced nuts shall be flat and the diameter of chamfer circle shall be equal to the maximum width across flats within a tolerance of - 15%. The length of chamfer at hex corners shall be from 5% to 15% of the basic thread diameter. The surface of chamfer may be slightly convex or rounded. Bearing surfaces shall be flat and perpendicular to the axis of the threaded hole within the FIM limits specified for the respective strength level. 12 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,r F- 0.016 in. approx. TABLE 6 DIMENSIONS OF HEX THICK SLOTTED NUTS T S 0 H Thickness Unslotted Width of Thickness Slot Runout of Bearing Surface FIM Bmalc Max. Min. Max. Mln. Max. Min. Max. 0.288 0.274 0.20 0.18 0.10 0.07 0.015 0.338 0.320 0.24 0.22 0.12 0.09 0.016 0.415 0.398 0.29 0.27 0.16 0.12 0.017 0.463 0.444 0.31 0.29 0.15 0.12 0.016 0.673 0.662 0.42 0.40 0.18 0.15 0.019 0.821 0.698 0.43 0.41 0.18 0.16 0.020 0.731 0.708 0.61 0.49 0.24 0.18 0.021 0.827 0.798 0.57 0.55 0.24 0.18 0.023 0.922 0.890 0.67 0.64 0.24 0.16 0.025 1.018 0.982 0.73 0.70 0.30 0.24 0.027 1.176 1.138 0.63 0.80 0.33 0.24 0.030 1.272 1.228 0.89 0.86 0.40 0.31 0.033 1.399 1.361 1.02 0.98 0.40 0.31 0.036 1.628 1.474 1 .OB 1.04 0.40 0.37 0.039 3 3 4 F Nominal Size Or t; Basic Major Dlsm. of Thread Width Across Flats Width Acrorr Comoro - - MOX. Min. - 0.505 0.488 0.677 0.567 0.860 0.828 0.794 0.768 0.888 0.840 1.010 0.992 1.083 1.061 1.299 1.240 1.518 1.447 1.732 1.863 1.949 1.859 2.185 2.088 2.382 2.273 2.698 2.480 - - 2 Basic MSX. Mkt. 14 0.2500 %6 0.3126 % 0.3760 416 0.4375 I2 0.6000 B/IS 0.6626 % 0.6260 k 0.7600 I8 0.8760 he 0.438 0.428 I2 0.600 0.499 Yl4 0.582 0.661 Vte 0.888 0.876 3l4 0.760 0.736 la 0.876 0.881 ?h 0.938 0.922 1 Is 1.126 1 .oaa I%, 1.312 1.289 1 1 .oooo 1 I2 1.600 1.460 1 lo 1.1260 I”/14 1.888 1 .a31 1 I4 1.2500 1 Ia 1.876 1.812 l?b 1.3760 2lte 2.082 1.994 1 I2 1 .sooo 2% 2.260 2.176 Stltl Notes 1 kz “I64 %2 *%4 Yl6 %u Y22 3/(6 nls2 1 w22 1 I4 1% 1 I2 fFo/ additional requirements refer to Notes on p. 14 and General Data on pp. 1 and 2.1 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,ASMElANSl 818.2.2-1987 SQUARE AND HEX NUTS (INCH SERIES) TABLE 6 (CONTD) GENERAL NOTES: Unification. Bold type indicates products unified dimensionally with British and Cana- dian standards. Unification of fine thread products is limited to sizes l in. and under. True Position of Tapped Hole. The axis of tapped hole shall be located at true position with respect to the axis of nut body within a tolerance zone having a diameter equiva- lent to 4% of the maximum width across flats, regardless of feature size. Countersink. Tapped hole shall be countersunk on the bearing face. The maximum countersink diameter shall be the thread basic (nominal) major diameter plus 0.030 in. for 3 / 8 in. nominal size nuts and smaller, and 1 .O8 times the basic major diameter for nuts larger than 3/8 in. No part of the threaded portion shall project beyond the bearing surface. Threads. Threads shall be unified coarse, fine, or 8 thread series (UNC, UNF or 8 UN series), Class 2B. Material. Unless otherwise specified, chemical and mechanical properties of steel nuts shall conform with Grade A of ASTM A 563, Carbon and Alloy Steel Nuts; or Grade 2 of SAE J995, Mechanical and Material Requirements for Steel Nuts. Nuts of other materials such as corrosion resistant (stainless) steel, brass, bronze, and alumi- num alloys shall have properties as agreed upon between the manufacturer and pur- chaser. The properties for nuts of several grades of corrosion resistant steel alloys are covered in ASTM F 594, and of several nonferrous materials in ASTM F 467. NOTES: Width Across Flats. Maximum width across flats shall not be exceeded (see excep- tion in General Data). No transverse section through the nut between 25% and 75% of the actual nut thickness as measured from the bearing surface shall be less than the minimum width across flats. For milled-from-bar nuts, see statement in General Data pertaining to the nominal bar size to be used. Corner Fill. A rounding or lack of fill at junction of hex corners with chamfer shall be permissible provided the width across corners is within specified limits at and beyond a distance equal to 17.5% of the basic thread diameter from the chamfered faces. Slots. Slots shall be normal to nut flats. Contour of bottom of slots shall be at manu- facturers option, Requirements for gaging slots are in Appendix I. Tops and Bearing Surfaces of Nuts. Nuts in sizes 5/8 in. nominal size and smaller shall be double chamfered. Larger size nuts shall be double chamfered or have washer faced bearing surface and chamfered top. The diameter of chamfer circle on double chamfered nuts and diameter of washer face shall be within the limits of the maximum width across flats and 95% of the mini- mum width across flats. The top of washer faced nuts shall be flat and the diameter of chamfer circle shall be equal to the maximum width across flats within a tolerance of - 15%. The length of chamfer at hex corners shall be from 5% to 1 5% of the basic thread diameter. The surface of chamfer may be siightly convex or rounded. Bearing surface shall be flat and perpendicular to the axis of the threaded hole within the FIM limits specified for the respective strength level. 14 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,SQUARE AND HEX NUTS (INCH SERIES) ASMEIANSI 818.2.2-1987 25 deg, approx. 25 deg. approx. Optional TABLE 7 DIMENSIONS OF HEAVY SQUARE NUTS Nominal Size Basic Major Diam. of Thread 1 4 0.2500 3 1 8 0.3750 % 6 0.3125 7 / 1 6 0.4375 111 O. 5000 5 1 0.6250 7 1 0.8750 3/4 0.7500 1 1 .o000 1 118 1.1250 1 318 1.3750 1 1 2 1.5000 1 1.2500 See Note F I 25 deg. approx Width Across I Basic 1 1 2 11 6 1 1 6 v 4 718 1 1 1 6 1 1 1 1 6 1 I 2 23/16 23/s 1 13/16 Flats Max. 0.488 0.500 Min. 0.562 O. 546 0.688 0.669 0.750 0.728 1 0.875 0.850 1 .O62 1 .O31 1.250 1.212 1.438 1.394 1.625 1.575 1.812 1.756 2.000 1.938 2 . 1 88 2.119 2.375 2.300 1 G I Width Across Comers 0.707 0.795 0.973 1 .O60 1.237 l. 503 1.768 2.033 2.298 2.563 2.828 3.094 3.359 Mm. 0.640 0.720 0.889 0.970 1.137 1.386 1.635 1 .B84 2.132 2.381 2.631 2.879 3 . 1 28 H Thickness - Max. 0.266 0.330 0.393 0.456 0.520 0.647 0.771 0.901 1 .O28 1.155 1.282 1.409 1.536 Min. 0.218 0.280 0.341 0.403 0.464 0.587 0.710 0.833 0.956 1 .O79 1.187 1.310 1.433 (For additional requirements refer to Notes on p. 16 and General Data on pp. 1 and 2.1 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,ASMElANSl 818.2.2-1987 SQUARE AND HEX NUTS (INCH SERIES) TABLE 7 (CONTD) GENERAL NOTES: (al Tops of Nuts. Tops of nuts shall be flat and chamfered or washer crowned. Diameter of the chamfer circle shall be equal to the maximum width across flats within a toler- ance of - 15%. The surface of chamfer may be slightly convex or rounded. (b) Bearing Surface. Bearing surface shall be perpendicular to the axis of the threaded hole within a tolerance of 3 deg. for 1 in. nominal size nuts and smaller, and 2 deg. for nuts larger than 1 in. (c) True Position of Tapped Hole. The axis of tapped hole shall be located at true position with respectto the axis of nut body within a tolerance zone having a diameter equiva- lent to 10% of the maximum width across flats, regardless of feature size. (dl Threads. Threads shall be unified coarse thread series (UNC series), Class 2B. (e) Material. Unless otherwise specified, chemical and mechanical properties of steel nuts shall conform with Grade A of ASTM A 563, Carbon and Alloy Steel Nuts. Nuts of other materials such as corrosion resistant (stainless) steel, brass, bronze, and alu- minum alloys shall have properties as agreed upon between the manufacturer and purchaser. The properties for nuts of several grades of corrosion resistant steel alloys are covered in ASTM F 594, and of several nonferrous materials in ASTM F 467. NOTE: (1 ) Width Across Flats. Maximum width across flats shall not be exceeded (see excep- tion in General Data). No transverse section through the nut between 25% and 75% of the actual nut thickness as measured from the bearing surface shall be less than the minimum width across flats. 16 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,SQUARE AND HEX NUTS (INCH SERIES) ASME/ANSI 818.2.2-1987 TABLE 8 DIMENSIONS OF HEAVY HEX FLAT NUTS AND HEAVY HEX FLAT JAM NUTS Nominal Sire or Basic Major Diam. of Thread 1% 1.1260 IV4 1.2500 1% 1.3750 1 1 h 1.5000 1% 1.7500 2 2.0000 2% 2.2500 2% 2.5000 2% 2.7500 3 3.0000 3% 3.2500 3% 3.5000 3% 3.7500 4 4.0000 See Notes F Width Across Flats Max. 1.756 1 . 8 1 2 Mm. 2.000 1.938 2.188 2.119 2.375 2.300 2.750 2.662 3.125 3.025 3.500 3.388, 3.875 3.750 4.250 4.1 12 4.625 4.475 5.000 4.838 5.375 5.200 5.750 5.562 6.125 5.925 1 G Width Across Comers Max. 2.093 2.309 2.526 2.742 3.175 3.608 4.041 4.474 4.907 5.340 5.774 6.207 6.640 7.073 2 Min. 2.002 2.209 2.416 2.622 3.035 3.449 3.862 4.275 4.688 5.102 5.51 5 5.928 6.341 6.755 H Thickness Heavy Hex Flat Nuts Basic Max. 1% 1 . 1 5 5 1114 1.536 1112 1.409 1% 1.282 1% 1.790 2 2.044 2% 2.298 212 2.552 2% 2.806 3 3.060 3% 3.314 3% 3.568 33l4 3.822 4 4.076 Min. 1 .O79 1.187 1.310 1.433 1.679 1.925 2.155 2.401 2.647 2.893 3.124 3.370 3.61 6 3.862 H1 Thickness Heavv Hex Flat Jam Nuts Max. 0.655 0.782 0.846 0.91 1 1 .o40 1.169 1.298 1.552 1.681 1.81 O 1.939 2.068 2.197 2.326 Mm. 0.579 0.687 0.747 0.808 0.929 1 .o50 1.155 1.401 1.522 1.643 1.748 1.870 1.990 2.112 (For additional requirements refer to Notes on p. 18 and General Data on pp. I and 2.1 17 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,ASMElANSl 818.2.2-1987 TABLE 8 (CONTD) SQUARE AND HEX NUTS (INCH SERIES) GENERAL NOTES: (a) Unification. Bold type indicates products unified dimensionally with British and Cana- dian standards. (b) Smaller Sizes. For sizes /4 in. through 1 in., the nuts specified in Table 9 are recom- (c) Tops of Nuts. Tops of nuts shall be flat and chamfered. Diameter of the chamfer circle shall be equal to the maximum width across flats within a tolerance of - 15%. The length of chamfer at hex corners shall be from 5% to 15% of the basic thread diame- ter. The surface of chamfer may be slightly convex or rounded. (dl Bearing Surface. Bearing surface shall be flat and perpendicular to the axis of the threaded hole within a tolerance of 2 deg. (e) True Position of Tapped Hole. The axis of tapped hole shall be located at true position with respect to the axis of nut body within a tolerance zone having a diameter equiva- lent to 4% of the maximum width across flats for 1 h in. nominal size nuts or smaller and 6% of the maximum width across flats for nuts larger than 1 h in., regardless of feature size. mended. (f) Threads. Threads shall be unified coarse thread series (UNC series), Class 28. (9) Material. Unless otherwise specified, chemical and mechanical properties of steel nuts shall conform with Grade A of ASTM A 563, Carbon and Alloy Steel Nuts. Nuts of other materials such as corrosion resistant (stainlessrsteel, brass, bronze, and alu- minum alloys shall have properties as agreed upon between the manufacturer and purchaser. The properties for nuts of several grades of corrosion resistant steel alloys are covered in ASTM F 594, and of several nonferrous materials in ASTM F 467. NOTES: (1 ) Width Across Flats. Maximum width across flats shall not be exceeded (see excep- tion in General Data). No transverse section through the nut between 25% and 75% of the actual nut thickness as measured from the bearing surface shall be less than the minimum width across flats. For milled-from-bar nuts, see statement in General Data pertaining to the nominal bar size to be used. (2) Corner Fill. A rounding or lack of fill at junction of hex corners with chamfer shall be permissible provided the width across corners is within specified limits at and beyond a distance equal to 17.5% of the basic thread diameter from the chamfered face. 18 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,SQUARE AND HEX NUTS (INCH SERIES) ASMElANSl 818.2.2-1987 (Table 9 begins on following page.) 19 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,F 0 ; / - / fp I- G -1 1 TABLE 9 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,TABLE 9 DIMENSIONS OF HEAVY HEX NUTS AND HEAVY HEX JAM NUTS Nominal Size or Basic Major Diam. of Thread H 4 Runout of Bearing Face FIM Heavy Hex Nuts Heavy Hex p Jam Nuts Specified Proof Load up to 150,000 psi 150,000 psi and Greater All Strength Levels G F Thickness Heavy Hex Nuts Width Across Flats Width Across Corners Thickness Heavy Hex Jam Nuts Basic Max. Min. Max. Min. I4 5/16 %J 7116 I2 0.2500 12 0.500 0.488 0.577 0.556 0.3125 6lre 0.562 0.546 0.650 0.622 0.3750 /la 0.688 0.669 0.794 0.763 0.4375 314 0.750 0.728 0.866 0.830 0.5000 16 0.875 0.859 1.010 0.969 Basic %34 g/64 =/m 27h =I64 Max. Min. 0.250 0.218 l/64 0.188 0.156 0.017 0.011 0.017 0.314 0.280 =I64 0.220 0.186 0.020 0.012 0.020 0.377 0.341 =I04 0.252 0.216 0.02 1 0.014 0.021 0.441 0.403 17/64 0.285 0.247 0.022 0.015 0.022 0.504 0.464 164 0.317 0.277 0.023 0.016 0.023 g/m % 314 hl la 1 0.5625 6/16 0.938 0.909 1.083 1.037 0.6250 1/16 1.082 1.031 1.227 1.175 0.7500 1 I4 1.250 1.212 1.443 1.382 0.8750 1 he 1.438 1.394 1.660 1.589 1 .oooo 1% 1.625 1.575 1.876 1.796 35164 0.568 0.526 %4 0.631 0.587 %4 0.758 0.710 %34 0.885 0.833 63/g4 1.012 0.950 1 I6 1 I4 1318 1 h 1 =/s 1.1250 1 13/16 1.812 1.756 2.093 2.002 1.2500 2 2.000 1.938 2.309 2.209 1.3750 23hl 2.188 2.119 2.626 2.416 1.5000 2% 2.375 2.300 2.742 2.622 1.6250 wl6 2.562 2.481 2.959 2.828 17164 1.139 1.079 1 I32 1.251 1.187 I/32 1.378 1.310 1 =I332 1.505 1.433 1 S/32 1.632 1.556 1% 1.7500 1 r/a 1.8750 2 2.0000 2% 2.2500 212 2.5000 z3/q 2.750 2.662 3.175 3.035 2%6 2.938 2.844 3.392 3.242 3% 3.125 3.025 3.808 3.449 3% 3.500 3.388 4.041 3.862 3% 3.875 3.750 4.474 4.275 123132 1.759 1.679 127132 1.886 1.802 1 Jl32 2.013 1.925 2 =I64 2.251 2.155 229f64 2.505 2.401 2% 2.7500 414 4.250 4.112 0.907 4.688 246,64 2.759 2.647 3 3.0000 4% 4.625 1.475 5.340 5.102 26/64 3.013 2.893 314 3.2500 5 5.000 1.838 5.774 5.515 3YlS 3.252 3.124 3% 3.5000 53t6 5.375 5.200 5.207 5.928 3116 3.506 3.370 3314 3.7500 53/4 5.750 5.562 5.640 6.341 3”/16 3.760 3.616 4 4.0000 6% 5.125 5.925 7.073 6.755 3%6 4.014 3.862 See Notes 1 2 Basic Max. Min. Max. 164 0.349 0.307 0.024 0.017 0.024 2=i4 0.381 0.337 0.025 0.018 0.025 37164 0.446 0.398 0.027 0.020 0.027 3164 0.510 0.458 0.029 0.022 0.029 36/64 0.575 0.519 0.031 0.024 0.031 3g/s4 0.639 0.579 0.033 0.027 0.033 23132 0.751 0.687 0.035 0.030 0.035 25l32 0.815 0.747 0.038 0.033 0.038 27h 0.880 0.808 0.04 1 0.036 0.041 2%2 0.944 0.868 0.044 0.038 0.044 3152 1.009 0.929 0.048 0.041 0.048 1 I32 1.073 0.989 0.051 0.044 0.051 13132 1.138 1.050 0.055 0.047 0.055 1 13/64 1.251 1.155 0.061 0.052 0.061 1 2g/64 1.505 1.401 0.068 0.058 0.068 1 37t64 1.634 1.522 0.071 0.064 0.074 145104 1.763 1.643 0.081 0.070 0.081 1%6 1.876 1.748 0.087 0.075 0.087 1YlS 2.006 1.870 0.094 0.081 0.094 2/l6 2.134 1.990 0.100 0.087 0.100 m6 2.264 2.112 0.107 0.093 0.107 3 (For additional requirements refer to Notes on p. 22 and General Data on pp. 1 and 2.) Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,ASMElANSl B1 8.2.2-1 987 SQUARE AND HEX NUTS (INCH SERIES) GENERAL NOTES: (a) Unification. Bold type indicates products unified dimensionally with British and Cana- dian standards. Unification of fine thread products is limited to sizes l in. and under. (b) True Position of Tapped Hole. The axis of tapped hole shall be located at true position with respect to the axis of nut body within a tolerance zone having a diameter equiva- lent to 4% of the maximum width across flats for 1 x in. nominal size nuts or smaller, and 6% of the maximum width across flats for nuts larger than 1 h in., regardless of feature size. (c) Countersink. Tapped hole shall be countersunk on the bearing face or faces. The max- imum countersink diameter shall be the thread basic (nominal) major diameter plus 0.030 in. for 3/s in. nominal size nuts and smaller, and 1 .OB times the basic major diameter for nuts larger than 3/8 in. No part of the threaded portion shall project be- yond the bearing surface. (dl Threads. Threads shall be unified coarse, fine, or B thread series (UNC, UNF or 8 UN series), Class 28. Unless otherwise specified, coarse thread series shall be furnished. (e) Material. Unless otherwise specified, chemical and mechanical properties of steel nuts shall conform with Grade A of ASTM A 563, Carbon and Alloy Steel Nuts; or Grade 2 of SAE J995, Mechanical and Material Requirements for Steel Nuts. Nuts of other materials such as corrosion resistant (stainless) steel, brass, bronze, and alumi- num alloys shall have properties as agreed upon between the manufacturer and pur- chaser. The properties for nuts of several grades of corrosion resistant steel alloys are covered in ASTM F 594, and of several nonferrous materials in the ASTM F 467. NOTES: (1 1 Width Across Flats. Maximum width across flats shall not be exceeded (see excep- tion in General Data). No transverse action through the nut between 25% and 75% of the actual nut thickness as measured from the be.aring surface shall be less than the minimum width across flats. For milled-from-bar nuts, see statement in General Data pertaining to the nominal bar size to be used. (2) Corner Fill. A rounding or lack of fill at junction of hex corners with chamfer shall be permissible provided the width across corners is within specified limits at and beyond a distance equal to 17.5% of the basic thread diameter from the chamfered faces. (3) Tops and Bearing Surfaces of Nuts. Nuts in sizes 71s in. nominal size and smaller shall be double chamfered. Larger size nuts shall be double chamfered or have washer faced bearing surface and chamfered top. The diameter of chamfer circle on double chamfered nuts and diameter of washer face shall be within the limits of the maximum width across flats and 95% of the mini- mum width across flats. The tops of washer faced nuts shall be flat and the diameter of chamfer circle shall be equal to the maximum width across flats within a tolerance of - 15%. The length of chamfer at hex corners shall be from 5% to 1 5% of the basic thread diameter. The surface of chamfer may be slightly convex or rounded. Bearing surfaces shall be flat and, unless otherwise specified, shall be perpendicu- lar to the axis of the threaded hole within the FIM limits tabulated for the respective nut size, type, and strength level. Where purchaser specifies close runout of bearing face style heavy hex or heavy hex jam nuts in nominal sizes 2 in. through 4 in., nuts shall be so processed as to have a maximum bearing face runout of 0.01 O in. FIM. 22 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,SQUARE AND HEX NUTS (INCH SERIES) ASMElANSl 818.2.2-1987 (Table 10 begins on following page.) 23 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,STD-ASME BLB*Z*Z-ENGL L987 m 0759b70 ObL773b OLb M ASMElANSl B1 8.2.2-1 987 W 4 m c a SQUARE AND HEX NUTS (INCH SERIES) 2 4 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,Nominal Size or Basic Major Diam. of Thread I4 0.2500 I2 0.500 0.466 0.577 0.556 %/as 0.250 0.218 0.15 0.13 0.10 0.07 h9 0.3125 YlS 0.562 0.546 0.650 0.622 9l94 0.314 0.280 0.21 0.19 0.12 0.09 J/s 0.3750 “I18 0.666 0.669 0.794 0.763 23h4 0.377 0.341 0.24 0.22 0.15 0.12 I16 0.4375 314 0.750 0.728 0.866 0.830 2164 0.441 0.403 0.28 0.26 0.15 0.12 it $ Runout ,I of X Bearing .$ Surface 2 FIM = i? Max. I E 0.017 a 0.020 !z 0.021 0.022 I2 0.5000 I 0.875 0.850 1.010 0.969 3194 0.504 0.464 0.34 0.32 0.18 0.15 0.023 YlS 0.5625 Yl6 0.936 0.909 1.083 1.037 35164 0.568 0.526 0.37 0.35 0.18 0.15 0.024 610 0.6250 llle I .062 1.031 1.227 1.175 =%4 0.631 0.587 0.40 0.38 0.24 0.18 0.025 k 0.7500 I I4 1.250 1.212 I.443 1.382 47164 0.758 0.710 0.49 0.47 0.24 0.18 0.027 la 0.8750 l%e 1.430 I .394 1.660 1.589 %4 0.885 0.833 0.62 0.59 0.24 0.18 0.029 t.i 1 I .oooo 1% 1.625 I .575 I .876 1.796 93144 1.012 0.956 0.72 0.69 0.30 0.24 0.031 I l&l 1.1250 l=llS 1.812 I .756 2.093 2.002 1 v-34 1.139 I .079 0.78 0.75 0.33 0.24 0.033 I ?I4 I .2500 2 2.000 I .938 2.309 2.209 17132 1.251 1.187 0.86 0.83 0.40 0.31 0.035 I 319 I .3750 2% 2.188 2.119 2.526 2.416 I I2 1.5000 23h 2.375 2.300 2.742 2.622 1% 1.7500 2% 2.750 2.662 3.175 3.035 2 2.0000 3% 3.125 3.025 3.008 3.449 I .378 1.310 0.99 0.95 0.40 0.31 0.038 1.505 1.433 1.05 1.01 0.46 0.37 0.041 I .759 1.679 1.24 1.20 0.52 0.43 0.048 2.013 1.925 1.43 1.38 0.52 0.43 0.055 2% 2.2500 3% 3.500 3.388 4.041 3.862 2% 2.5000 3710 3.875 3.750 4.474 4.275 2% 2.7500 4% 4.250 4.112 4.907 4.668 3 3.0000 4% 4.625 4.475 5.340 5.102 2.251 2.155 1.67 1.62 0.52 0.43 0.061 2.505 2.401 1.79 1.74 0.64 0.55 0.068 2.759 2.647 2.05 1.99 0.64 0.55 0.074 3.013 2.893 2.23 2.17 0.71 0.62 0.08 1 3% 3.2500 5 5.000 4.838 5.774 5.515 3% 3.5000 53/a 5.375 6.200 6.207 5.928 3314 3.7500 5% 5.750 5.562 6.640 6.341 4 4.0000 6% 6.125 5.925 7.073 6.755 1 A2 1 Hz I 23132 13132 23184 2%4 24% 2%i4 33118 37h 3”lla 3% 3.252 3.124 2.47 2.41 0.71 0.62 3.506 3.370 2.72 2.65 0.71 0.62 3.760 3.616 2.97 2.90 0.71 0.62 4.014 3.862 3.22 3.15 0.71 0.62 0.087 0.094 0.100 0.107 E; zz 2 4 E _ w _- See Notes TABLE 10 DIMENSIONS OF HEAVY HEX SLOTTED NUTS F G Width Across Width Across Flats Corners BdC M8X. Min. Max. Min. Basic Max. Min. Mex. Min. Max, Mill. 1 2 H Thickness T Unslotted Width of Thickness Slot 3 s 3 (For additional requirements refer to Notes on p. 26 and General Data on pp. 1 and 2.) E io iG 2 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,ASME/ANSI B1 8.2.2-1 987 SQUARE AND HEX NUTS (INCH SERIES) TABLE 10 (CONTD) GENERAL NOTES: (a) Unification. Bold type indicates products unified dimensionally with British and Cana- dian standards. Unification of fine thread products is limited to sizes l in. and under. (b) True Position of Tapped Hole. The axis of tapped hole shall be located at true position with respect to the axis of nut body within a tolerance zone having a diameter equiva- lent to 4% of the maximum width across flats for 1 Ih in. nominal size nuts or smaller, and 6% of the maximum width across flats for nuts larger than 1 h in., regardless of feature size. (c) Countersink. Tapped hole shall be countersunk on the bearing face. The maximum countersink diameter shall be the thread basic (nominal) major diameter plus 0.030 in. for 3 / 8 in. nominal size nuts and smaller, and 1 .O8 times the basic major diameter for nuts larger than 3 / a in. No part of the threaded portion shall project beyond the bearing surface. (d) Threads. Threads shall be unified coarse, fine, or 8 thread series (UNC, UNF or 8 UN series), Class 2B. Unless otherwise specified, coarse thread series shall be furnished. (e) Material. Unless otherwise specified, chemical and mechanical properties of steel nuts shall conform with Grade A of ASTM A 563, Carbon and Alloy Steel Nuts; or Grade 2 of SAE J995, Mechanical and Material Requirements for Steel Nuts. Nuts of other materials such as corrosion resistant (stainless) steel, brass, bronze, and alumi- num alloys shall have properties as agreed upon between the manufacturer and pur- chaser. The properties for nuts of several grades of corrosion resistant steel alloys are covered in ASTM F 594, and of several nonferrous materials in ASTM F 467. NOTES: (1 1 Width Across Flats. Maximum width across flats shall not be exceeded (see excep- tion in General Data). No transverse section through the nut between 25% and 75% of the actual nut thickness as measured from the bearing surface shall be less than the minimum width across flats. For milled-from-bar nuts, see statement in General Data pertaining to the nominal bar size to be used. (2) Corner Fill. A rounding or lack of fill at junction of hex corners with chamfer shall be permissible provided the width across corners is within specified limits at and beyond a distance equal to 17.5% of the basic thread diameter from the chamfered faces. (3) Slots. Slots shall be normal to nut flats. Contour of bottom of slots shall be at manu- facturers option. Requirements for gaging slots are in Appendix I. (4) Tops and Bearing Surfaces of Nuts. Nuts in sizes / r 6 in. nominal size and smaller shall be double chamfered. Larger size nuts shall be double chamfered or have washer faced bearing surface and chamfered top. The diameter of chamfer circle on double chamfered nuts and diameter of washer face shall be within the limits of the maximum width across flats and 95% of the mini- mum width across flats. The top of washer faced nuts shall be flat and the diameter of chamfer circle shall be equal to the maximum width across flats within a tolerance of - 15%. The length of chamfer at hex corners shall be from 5% to 1 5% of the basic thread diameter. The surface of chamfer may be slightly convex or rounded. Bearing surface shall be flat and perpendicular to the axis of the threaded hole within the FIM limits specified for the respective strength level. 26 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,APPENDIX I SLOT GAGES AND GAGING FOR SLOTTED NUTS (This Appendix is not part of ASME/ANSI 618.2.2-1987, and is included for information purposes only.) The gages specified below shall be used to determine the acceptability of the alignment and bottom con- tours of the slots in slotted nuts in accordance with the following procedure. The gaging for slot alignment provides for equal variations in the location of the cotter pin hole in the bolt and the location of the slots in the nut. To inspect the nut, the slotted end of the gage shall be inserted through the threaded hole from the bear- ing surface of the nut. The gage pin shall then be in- serted into both the gage slot and the nut slots through three adjacent faces of the nut, consecutively. Slot alignment shall be considered satisfactory if the gage pin fits into the slots without interference at all three gaging positions. The bottom contour shall be accept- able if the gage pin contacts the bottom surfaces of op- posite slots during the alignment gaging at all three positions. Some deviations from the specified gage plug diameters D may be necessary to compensate for vari- ations in the nut thread minor diameter due to differ- ences in manufacturing practices. To insure adequate service life, gages and gage pins shall be suitably hardened. Contour beyond this Pin must be round and straight for this length I I . 1 Hole for attaching Contour of head pin to gage optional Gage Gage Pin DIMENSIONS OF SLOT GAGES AND GAGE PINS A H G F E D Note (111 C B Gage Rug Diameter Gage Gage Gage Gage Gage . Gage Gage Pilot Pin Pin Slot Pilot Fine Coarse Face Hug Nominal Size Length Diameter Width Diameter Thread Thread Diameter Length Length or Basic Major Diam. +o.ooo +0.002 + 0.000 + 0.000 of Thread Min. -0.002 -0.000 k0.005 -0.001 -0.001 Min. Max. Min. 14 0.2500 1.25 0.1 15 0.115 0.345 0.383 0.360 0.562 0.200 0.463 /IS 0.4375 1.19 0.115 0.115 0.292 0.330 0.307 0.500 0.180 0.415 3h 0.3750 1 .o0 0.065 0.065 0.181 0.211 0.196 0.375 0.110 0.288 5/16 0.3125 1 .O6 0.085 0.085 0.237 0.267 0.252 0.406 0.150 0.316 (Table continues on next pagel 27 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,DIMENSIONS OF SLOT GAGES AND GAGE PINS (CONTD) Nominal Size or Basic Major Diam. of Thread 0.5000 0.5625 0.6250 0.7500 0.8750 1 .oooc 1.1250 1.2500 1.3750 1.5000 1.7500 2.0000 2.2500 2.5000 2.7500 3.0000 3.2500 3.5000 3.7500 4.0000 NOTE: A Gage Pilot Length Min. 0.573 0.621 0.731 0.827 0.922 1 .O18 1.176 1.272 1.399 1.526 1.759 2.01 3 2.251 2.505 2.759 3.01 3 3.252 3.506 3.760 4.01 4 B Gage M l Length Max. 0.260 0.280 0.310 0.370 0.480 0.550 0.600 0.660 0.770 0.810 1.190 1.370 1.610 1.730 1.980 2.160 2.400 2.640 2.890 3.1 40 C Gage Face Diameter Min. 0.625 0.703 O. 78 1 0.938 1.109 1 .250 1.406 1.562 1.718 2.188 2.500 2.818 3.125 3.438 3.750 4.062 4.375 4.688 5.000 1 .a75 D Note (111 Gage Plug Diameter Coarse - 0.001 - 0.001 +o.ooo +o.ooo Thread Thread Fine 0.41 7 0.446 0.472 0.502 0.527 0.565 0.642 0.682 0.755 1.160 1.095 1 .O35 0.970 0.910 0.865 0.798 1.195 1.410 1.320 1.285 1.759 1.534 2.009 2.229 2.479 . 2.729 . 2.979 . 3.229 ,. 3.479 . 3.729 . . . . . E Gage Pilot Diameter f 0.005 0.402 0.457 0.512 0.627 0.740 0.850 0.955 1 .O80 1.180 1.305 1.519 1 .744 1.994 2.214 2.464 2.714 2.964 3.214 3.464 3.714 F Gage Slot Width +0.002 -0.000 0.145 0.145 0.175 0.175 0.175 0.235 0.235 0.305 0.305 0.365 0.425 0.425 0.425 0.545 0.545 0.615 0.61 5 0.61 5 0.61 5 0.61 5 G H Gage Pin Gage Length Diameter Pin + 0.000 - 0.002 Min. O. 145 1.38 O. 145 1.44 0.175 1.56 0.175 1.75 0.175 1.94 0.235 2.1 2 0.235 2.31 0.305 2.50 0.305 3.62 0.425 3.25 0.425 2.88 0.365 2.69 0.425 4.00 0.545 4.38 0.545 4.75 0.61 5 5.12 0.615 5.50 0.615 5.88 0.61 5 6.25 0.61 5 6.62 (1 ) Diameters tabulated are equivalent to the minimum minor diameters of Class 28 threads. If the nuts are not threaded with unified coarse (UNQ or fine (UNF) threads, the diameter of gage shall be the same as the diameter of the GO thread plug gage for the bore. 28 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,APPENDIX II FORMULAS FOR NUT DIMENSIONS (This Appendix is not part o f ASMElANSl 818.2.2-1987, and is included for information purposes only.) (Table begins on following page.) 29 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,APPENDIX II Nut Type Nut Size INote (111 Width Across Flats Tolerance Basic (Minus) Nut Thickness Basic Tolerance Note (2)I (Plus or Minus) Width Across Corners Limits Square % through % 3/a through 1 l/z F- 1.5000 +0.062 0.0500 H = 0.0760 0.016D +0.012 Max. G = 1.4142 (Max. fl F = 1.5000 0.0500 H 0.8750 0.016D 0.012 Min. G = 1.373 = + (Min. R - 0.030 Hex Fiat 1 l/s through 1 l/z 0.0500 H = 0.8750 0.016D +0.012 Max. G = 1 .1547 (Max. 0 Min. G = 1.14 (Min. Fl Hex Flat Jam 1 la F = I.5000 0.0500 1 % through 1% F = 1.5000 0.0500 H = 0.5000 +0.062 0.016D +0.012 Max. G = 1.1647 (Max. F) H = 0.5000 +0.125 0.016D +0.012 Min. G = 1.14 (Min. fl I4 F = 1.5000 + 0.062 0.015D +0.006 H = 0.8750 0.0150 +0.003 Hex and Hex Slotted %6 through 51s F= 1.5000 0.015D +0.006 H = 0.8750 0.015D +0.003 Max. G = 1.1547 (Max. R % through 1 I/e F = 1.5000 0.0500 H = 0.8750 - 0.016 0.016D +0.012 Min. G = 1.14 (Min. n 1114 through 1 h F = 1.5000 0.0500 H = 0.8750 -0.031 0.016D +0.012 I4 F = 1.5000 + 0.062 0.0150 + 0.006 H = See Table 0.015D + 0.003 Hex Jam %a through 5/e 314 through 1 j/a F = 1.5000 F- 1.5000 0.0150 + 0.006 H = See Table 0.015D +0.003 Max. G = 1.1547 (Max. R 0.0500 H = 0.5000 +0.047 0.016D +0.012 Min. G = 1.14 (Min. n Hex Thick and Hex Thick Slotted 1 l/4 through 1 l/z F= 1.5000 0.0500 H = 0.5000 +0.094 0.016D +0.012 14 F = 1.5000 +0.062 0.015D + 0.006 H = See Table 0.015D + 0.003 %6 through 510 k through 1 l/2 F= 1.5000 0.0150 +0.006 H See Table. 0.0150 0.003 Max. G = 1.1547 (Max. fI = + Min. G = 1.14 (Min. R F = 1.5000 0.0500 H = See Table 0.015D + 0.003 Heavy Square Ii4 through 1112 F= 1.5000 +0.125 0.0500 H = 1.0000 0.016D +0.012 I Max. G I 1.4142 (Max. Fl Note (311 Min. G = 1.373 (Min. fl - 0.030 Heavy Hex Flat I 1% through 4 F = 1.5000 +0.125 I 0.0500 H = 1 .OOOD 0.016D +0.012 I
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