GB/T 48251-2026航空航天流体系统塑料防护帽和防护螺塞尺寸

ICS23.040

CCSV21

中华人民共和国国家标准

GB/T48251—2026

航空航天流体系统

塑料防护帽和防护螺塞尺寸

Aerospacefluidsystems—Plasticprotectivecapsandplugs—Dimensions

（ISO9634：1994，Aerospace—Fluidsystems—Dimensionsofplasticprotective

capsandplugs，MOD）

2026⁃09⁃28发布2027⁃04⁃01实施

国家市场监督管理总局

国家标准化管理委员会发布

GB/T48251—2026

目次

前言··························································································································Ⅲ

1范围·······················································································································1

2规范性引用文件········································································································1

3术语和定义··············································································································1

4螺纹·······················································································································1

5用于锥形管螺纹接头的内螺纹防护螺塞··········································································1

6用于锥形管螺纹接头的外螺纹防护螺塞··········································································3

7用于端口连接的外螺纹防护螺塞···················································································4

8用于附件和软管非螺纹孔（内部保护）及管端（内部和外部保护）的防护帽································5

参考文献·····················································································································7

Ⅰ

GB/T48251—2026

前言

本文件按照GB/T1.1—2020《标准化工作导则第1部分：标准化文件的结构和起草规则》的规定

起草。

本文件修改采用ISO9634：1994《航空航天流体系统塑料保护护盖和堵塞的尺寸》。

本文件增加了“规范性引用文件”一章。

本文件做了下列编辑性改动：

——为与现有标准协调，将标准名称改为《航空航天流体系统塑料防护帽和防护螺塞尺寸》；

——用资料性引用的GB/T43924.3替换ISO5855⁃3，以适应我国技术条件，提供可操作性（见

第4章）；

——图2增加了脚注a。

请注意本文件的某些内容可能涉及专利。本文件的发布机构不承担识别专利的责任。

本文件由全国航空器标准化技术委员会（SAC/TC435）提出并归口。

本文件起草单位：上海飞机制造有限公司、中国航空工业标准件制造有限责任公司、沈阳飞机工业

（集团）有限公司、成都凯天电子股份有限公司。

本文件主要起草人：俞佳晟、姚丁柔、吴惠敏、周静、吴松林、赵雄、邱娟、孙健伟、王星、焦阳、任秀君、

吴涯、谭宁伟。

Ⅲ

GB/T48251—2026

航空航天流体系统

塑料防护帽和防护螺塞尺寸

1范围

本文件规定了各种类型的塑料防护帽和防护螺塞的构型和尺寸。

本文件适用于存储期间保护航空航天流体系统组件开口（光滑或螺纹端口、管道或软管的端部、管

件和端口连接）的防护帽和防护螺塞的设计与生产。

2规范性引用文件

本文件没有规范性引用文件。

3术语和定义

下列术语和定义适用于本文件。

3.1

防护螺塞protectiveplug

带有内螺纹或外螺纹的封闭件。

3.2

防护帽protectivecap

无螺纹的封闭件。

4螺纹

本文件规定的防护帽和防护螺塞的螺纹/螺距组合，对于第5章和第6章所示螺塞，采用

GB/T43924.3中的规定；对于第8章所示螺塞，采用ISO7320中的规定。螺纹公差宜在产品标准中

明确规定，以确保其与所采用的制造工艺相匹配，并确保能够用手将部件完全拧紧到位。

5用于锥形管螺纹接头的内螺纹防护螺塞