小五金工程评估细则介绍

1、目录1. 螺钉 61.1螺纹标志及尺寸 61.1.1米制细牙螺纹 71.1.2米制粗牙螺纹 8英制细牙螺纹 8英制粗牙螺纹 91.2通孔孔径101.3攻螺纹孔孔径111.3.1米制细牙螺纹111.3.2米制粗牙螺纹11英制细牙螺纹12英制粗牙螺纹13板材上孔与板边间距131.4 配合尺寸131.5 机械性能131.6 钢板厚度141.7 特殊螺钉151.7.1 自攻螺钉151.7.1.1 硬化层深度151.7.1.2 硬度161.7.1.3 尺寸161.7.1.4 工作扭力171.7.1.5 结合比与预冲孔呎寸关系181.7.1.6 钢板孔径及抽牙高19塑料螺钉20.1 螺纹形状20.2 硬度

2、21.3 螺纹呎寸21浮动螺钉21.1 浮动螺钉形状21.2 基本要求211.8 螺钉验证方法22资料：23A 螺钉常见穴型简介23B 常用板材硬度23C 电镀层232. 螺母242.1制造材料24材料牌号24材质化学成份24机械性能24螺母材料的选取242.2尺寸及公差25型号为“S. SS. CLS以及CLSS”的自铆螺母尺寸25型号为SP, 专用于不锈钢冲压板件上的自铆螺母尺寸28型号为H, HN, HNL之易削钢制自锁和防锁螺母的尺寸30型号为F的自铆螺母尺寸30尺寸公差322.3 压铆要求322.4 配合呎寸352.5 螺母验证方法353. 螺柱363.1制造螺柱材料36材料牌号36

3、化学成份36机械性能36螺柱材料的选取373.2尺寸37型号为“SO. SON. SOA. SOS. ”的通孔螺柱37.1一般尺寸38.2螺纹规格和螺柱长度39型号为“BSO.BSON. BSOA.BSOS. ”的盲孔螺柱40.1一般尺寸40.2螺纹规格和螺柱长度413.3 公差433.4 压铆要求433.5 螺柱验证方法444. 支柱454.1型号为“SO.SON. SOA.SOS”的通孔支柱45材料牌号45材质化学成份45机械性能45螺柱材料的选取46一般尺寸46支柱规格和支柱长度47公差494.2 其它异型支柱49制造材料49尺寸49板材厚度及孔径514.3压铆要求514.4 支柱验证方

4、法525.拉钉535.1 拉钉制造材料545.2 尺寸545.3 拉钉验证方法556.弹簧566.1 弹簧制造材料566.2弹簧钢丝呎寸56制造弹簧用不锈钢钢丝标准直径56标准钢丝尺寸偏差576.3 弹簧自由长度576.4 弹簧外径D 576.5弹簧的总圈数576.6 弹簧的方向576.7弹簧验证方法571 螺钉定义：由头部和螺杆两部份构成的一类紧固件本手册中包括的螺钉主要有机械螺钉、自攻螺钉、塑料螺钉和浮动螺钉等机械螺钉：由头部和螺杆两部份构成的一类金属紧固件主要用于一个带有内螺纹孔的零件与带有通孔的零件之间的紧固联接，不需要螺母配合；也用于带有通孔的零件之间的紧固联接，但要与螺母配合属可拆

5、卸连接自攻螺钉：由头部和螺杆两部份构成的一类金属紧固件，但螺杆上的螺纹为专用的自攻螺钉用螺纹用于紧固联接两个薄的金属构件，使之成为一体，构件上需事先制出小孔这种螺钉具有较高的硬度，可直接旋入构件的孔中，使构件孔中形成相应的内螺纹塑料螺钉：由头部和螺杆两部份构成的一类金属紧固件，但螺杆上的螺纹为专用的塑料螺钉用螺纹可直接旋入塑料件中，用于把一个带通孔的金属(或非金属)零件与一个塑料件紧固联接在一起浮动螺钉：压铆于冲件预制孔内, 用于经常拆装之冲压件的把手螺钉, 其结构特点是螺钉本体内包含弹性体1.1 螺纹标志及尺寸(除非特别指明，适用于所有的螺钉、螺母和螺柱)螺纹分为外螺纹和内螺纹两种，一般螺钉

6、为外螺纹形式，螺母或螺柱为内螺纹形式，常用的螺纹如图示H：原始三角形高度 P：螺距D：内螺纹公称直径 d：外螺纹公称直径H1：螺纹牙高D2：内螺纹中径 D1：内螺纹小径d2：外螺纹中径d1：外螺纹小径n为每英寸牙数1.1.1米制细牙螺纹H =0.866025Pd2=d-0.649519PD=dH1=0.541266Pd1=d-1.082532PD2=d2D1=d1单位mm螺纹标志PH1d(D)d2(D2)d1(D1)M1 0.20.20.1081.0000.8700.783M1.10.20.20.1081.1000.9700.883M1.20.20.20.1081.2001.0700.983M

7、1.40.20.20.1081.4001.2701.183M1.60.20.20.1081.6001.4701.383M1.80.20.20.1081.8001.6701.583M2 0.250.250.1352.0001.8381.729M2.20.250.250.1352.2002.0381.929M2.50.350.350.1892.5002.2732.121M3 0.350.350.1893.0002.7732.621M3.50.350.350.1893.5003.2733.121M4 0.50.50.2714.0003.6753.459M4.50.50.50.2714.5004.17

8、53.959M5 0.50.50.2715.0004.6754.459M5.50.50.50.2715.0005.1754.959M6 0.750.750.4066.0005.5135.1881.1.2米制粗牙螺纹H =0.866025Pd2=d-0.649519PD=dH1=0.541266Pd1=d-1.082532PD2=d2D1=d1单位mm螺纹标志PH1d(D)d2(D2)d1(D1)M10.250.1351.0000.8380.729M1.10.250.1351.1000.9380.829M1.20.250.1351.2001.0380.929M1.40.30.1621.4001.

9、2051.075M1.60.350.1891.6001.3731.221M1.80.350.1891.8001.5731.421M20.40.2172.0001.7401.567M2.20.450.2442.2001.9081.713M2.50.450.2442.5002.2082.013M30.50.2713.0002.6752.459M3.50.60.3253.5003.1102.850M40.70.3794.0003.5453.242M4.50.750.4064.5004.0133.688M50.80.4335.0004.4804.134M610.5416.0005.3504.917英制

10、细牙螺纹 P=25.4nH =0.866025Pd=(d)25.4 D=d H1=0.541266P d2=(d-0.649519/n)25.4 D2=d2d1=(d-1.082532/n)25.4 D1=d1单位mm螺纹标志(Reference)nPH1d(D)d2(D2)d1(D1)No. 0-80 UNF0.0600-80 UNF800.31750.1721.5241.3181.181No. 1-72 UNF0.0730-72 UNF720.35280.1911.8541.6261.473No. 2-64 UNF0.0860-64 UNF640.39690.2152.1841.9281.

11、755No. 3-56 UNF0.0990-56 UNF560.45360.2462.5152.2202.024No. 4-48 UNF0.1120-48 UNF480.52920.2862.8452.5022.271No. 5-44 UNF0.1250-44 UNF440.57730.3123.1752.7992.550No. 6-40 UNF0.1380-40 UNF400.63500.3443.5053.0942.817No. 8-36 UNF0.1640-36 UNF360.70560.3824.1663.7083.401No. 10-32 UNF0.1900-32 UNF320.79

12、380.4304.8264.3104.967No. 12-28 UNF0.2160-28 UNF280.90710.4915.4864.8974.503英制粗牙螺纹P=25.4nH =0.866025Pd=(d)25.4 D=d H1=0.541266P d2=(d-0.649519/n)25.4 D2=d2d1=(d-1.082532/n)25.4D1=d1单位mm螺纹标志(Reference)nPH1d(D)d2(D2)d1(D1)No. 1-64 UNC0.0730-64 UNC640.39690.2151.8541.5981.425No. 2-56 UNC0.0860-56 UNC56

13、0.45360.2462.1841.8901.694No. 3-48 UNC0.0990-48 UNC480.52920.2862.5152.1721.941No. 4-40 UNC0.1120-40 UNC400.63500.3442.8452.4332.156No. 5-40 UNC0.1250-40 UNC400.63500.3443.1752.7642.487No. 6-32 UNC0.1380-32 UNC320.79380.4303.5052.9902.647No. 8-32 UNC0.1640-32 UNC320.79380.4304.1663.6503.307No. 10-24

14、 UNC0.1900-24 UNC241.05830.5734.8264.1383.680No. 12-24 UNC0.2160-24 UNC241.05830.5735.4864.7984.3411.2通孔孔径螺钉连接零件上预制之通孔如图示：通孔孔径之尺寸如下表(单位mm)：螺钉公称直径通孔直径(d)mm1级2级3级4级11.11.21.31.21.31.41.51.41.51.61.81.61.71.821.71.822.11.82.02.12.222.22.42.62.22.42.62.82.32.52.72.92.52.72.93.12.62.833.233.23.43.63.53.7

15、3.94.244.34.54.85.54.54.855.3655.35.55.86.566.46.677.81.3攻螺纹孔孔径与螺钉相配的螺纹攻丝孔孔径取决于外内螺纹结合比之大小螺纹结合比(%)=(螺钉公称直径-攻丝孔直径)(2螺纹结合高度)100(%)1.3.1米制细牙螺纹(单位mm)螺纹标志公称直径螺纹结合比(%)1009590858075706560M11.0000.780.790.810.820.830.840.850.860.87M1.11.1000.880.890.910.920.930.940.950.960.97M1.21.2000.980.991.011.021.031.04

16、1.051.061.07M1.41.4001.181.191.211.221.231.241.251.261.27M1.61.6001.381.391.411.421.431.441.451.461.47M1.81.8001.581.591.611.621.631.641.651.661.67M22.0001.731.741.761.771.781.801.811.821.84M2.22.2001.931.941.961.971.982.002.012.022.04M2.52.5002.122.142.162.182.202.222.242.252.27M33.0002.622.642.662

17、.682.702.722.742.752.77M3.53.5003.123.143.163.183.203.223.243.253.27M44.0003.463.493.513.543.573.593.623.653.68M4.54.5003.963.994.014.044.074.094.124.154.18M55.0004.464.494.514.544.574.594.624.654.68M5.55.5004.964.995.015.045.075.095.125.155.18M66.0005.195.235.275.315.355.395.435.475.511.3.2米制粗牙螺纹(单

18、位mm)螺纹标志公称直径1009590858075706560M11.0000.730.740.760.770.780.800.810.820.84M1.11.1000.830.840.860.870.880.900.910.920.94M1.21.2000.930.940.960.970.981.001.011.021.04M1.41.4001.081.091.111.121.141.161.171.191.21M1.61.6001.221.241.261.281.301.321.331.351.37M1.81.8001.421.441.461.481.501.521.531.551.57M

19、22.0001.571.591.611.631.651.681.701.721.74M2.22.2001.711.741.761.791.811.831.861.881.91M2.52.5002.012.042.062.092.112.132.162.182.21M3*0.53.0002.462.492.512.542.572.592.622.652.68M3.53.5002.852.882.922.952.983.013.053.083.11M4*0.74.0003.243.283.323.363.393.433.473.513.55M4.54.5003.693.733.773.813.85

20、3.893.933.974.01M5*0.85.0004.134.184.224.264.314.354.394.444.48M66.0004.924.975.035.085.135.195.245.305.35英制细牙螺纹(单位mm)螺纹标志公称直径1009590858075706560No. 0-80 UNF1.5241.181.201.211.231.251.271.281.301.32No. 1-72 UNF1.8541.471.491.511.531.551.571.591.611.62No. 2-64 UNF2.1841.751.781.801.821.841.861.881.90

21、1.93No. 3-56 UNF2.5152.022.052.072.102.122.152.172.202.22No. 4-48 UNF2.8452.272.302.332.362.392.422.442.472.50No. 5-44 UNF3.1752.552.582.612.642.682.712.742.772.80No. 6-40 UNF3.5052.822.852.892.922.962.993.023.063.09No. 8-36 UNF4.1663.403.443.483.523.553.593.633.673.71No. 10-32 UNF4.8263.974.014.054

22、.104.144.184.224.274.31No. 12-28 UNF5.4864.504.554.604.654.704.754.804.854.90英制粗牙螺纹(单位mm)螺纹标志公称直径1009590858075706560No. 1-64 UNC1.8541.421.451.471.491.511.531.551.571.60No. 2-56 UNC2.1841.691.721.741.771.791.821.841.861.89No. 3-48 UNC2.5151.941.972.002.032.062.092.112.142.17No. 4-40 UNC2.8452.162.19

23、2.232.262.302.332.362.402.43No. 5-40 UNC3.1752.492.522.562.592.632.662.692.732.76No. 6-32 UNC3.5052.652.692.732.772.822.862.902.952.99No. 8-32 UNC4.1663.313.353.393.443.483.523.563.613.65No. 10-24 UNC4.8263.683.743.793.853.913.974.024.084.14No. 12-24 UNC5.4864.344.404.454.514.574.634.684.744.80板材上孔与

24、板边间距(对所有螺钉适用)板材上螺纹孔与板边间距如图要求b2t (b为孔与板边的距离，t为板材厚度)1.4 配合尺寸同种规格的螺钉需与同种规格螺纹的螺母或与预攻同规格螺纹孔的钢板配合如对M3的螺钉需与M3的螺母相配合，或者与在钢板上攻出M3的螺纹孔相配合1.5 机械性能(包括材质与热处理)一般用C0.20%的低碳钢制造，拉伸强度要求不小于330MPa；硬度不小于95HV(90HB或52HRB)；屈服强度不小于190MPa；延伸率不小于25%部分螺钉拉力如下表：螺纹标志M1.6M2M2.2M2.5M3M3.5M4M5M6最小拉力(N)4206206801120166022402900469066

25、301.6 钢板厚度(取决于螺钉与内螺纹的结合长度，钢板厚度应大于实际螺纹要求之旋合长度，单位mm)螺纹标志旋合长度M10.61.7M1.10.61.7M1.20.61.7M1.40.72M1.60.82.6M1.80.82.6M21.03M2.21.33.8M2.51.33.8M31.54.5M3.51.75M426M4.52.26.7M52.27.5M639M10.20.51.4M1.10.20.51.4M1.20.20.51.4M1.40.20.51.4M1.60.20.51.5M1.80.20.51.5M20.250.61.9M2.20.250.61.9M2.50.350.82.6M3

26、0.3513M3.50.3513M40.51.54.5M4.50.51.54.5M50.51.54.5M5.50.51.54.5M60.752.47.1注：对薄材，钢板厚度至少应大于23个螺距1.7 特殊螺钉自攻螺钉.1 硬化层深度一般应进行表面硬化处理表面渗碳或碳氮共渗层深度如下表(单位mm)：螺纹标志硬化层深度MinMax1-64 2-56 3-480.040.104-40 5-40 6-320.050.188-32 10-24 12-240.100.23.2 硬度表面渗碳或碳氮共渗处理后硬度之一般要求：表面硬度不小于45HRC 或450 HV芯部硬度2640HRC 270390 HV.3

27、 尺寸自攻螺钉截面应为弧形三角形，如图(L为导引长度，a为收尾长度)C、D值如下表 (单位inch)螺纹标志CDMaxMinMaxMin00-900.04810.04610.04590.04390-800.06130.05930.05880.05681-640.07450.07250.07100.06902-560.08750.08400.08400.08053-480.10100.09750.09700.09354-400.11450.11150.10950.10605-400.12750.12400.12250.11906-320.14100.13600.13500.13008-320.1

28、6700.16200.16100.156010-240.19400.18900.18500.180010-320.19300.18800.18700.182012-240.22000.21500.21100.2060对螺纹长度大于1/6inch，L应为23个螺距；对螺纹长度小于1/6inch，L应为12个螺距对螺纹收尾长度应小于1个螺距.4 工作扭力对不同厚度钢板及预制孔，自攻螺钉之工作扭力如下表(单位 lbfinch)：螺纹标志钢板厚(inch)孔径(inch)攻牙扭力第一次拆卸扭力攻螺纹后安装扭力破坏扭力2-560.04690.07540.5112670.06250.07640.51128

29、100.09380.07950.511211143-480.06250.0876123414150.09380.0897123515160.12500.0907124615184-400.03120.098612238110.06250.1029123415180.09380.10211123422275-400.06250.11112234522290.09380.11318344734410.12500.11620456838466-320.06250.12014344725300.09380.12020356935450.12500.12522466939458-320.09380.14

30、73057101365750.12500.1504547111475850.18750.150458111620759510-240.09380.1723558141865800.12500.1724558141880900.18750.17255913172210011510-320.09380.17335913111480950.12500.1775091312161001200.18750.177701216192511514012-240.12500.196659121924951150.18750.1997591321261351550.25000.20385101421261501

31、70.5结合比(%)与预冲孔呎寸(单位 inch)关系如表所示：结合比(%)100959085807570656055502-560.07440.07500.07560.07610.07670.07730.07790.07850.07900.07960.08023-480.08550.08610.08680.08750.08820.08880.08950.09020.09090.09160.09224-400.09580.09660.09740.09820.09900.09980.10060.10140.10230.10310.10395-400.10880.10960.11040.11120

32、.11200.11280.11360.11440.11530.11610.11696-320.11770.11870.11970.12070.12180.12280.12380.12480.12580.12680.12788-320.14370.14470.14570.14670.14780.14880.14980.15080.15180.15280.153810-240.16290.16430.16560.16700.16830.16970.17100.17240.17380.17510.176510-320.16970.17070.17170.17270.17380.17480.17580

33、.17680.17780.17880.179812-240.18890.19030.19160.19300.19430.19570.19700.19840.19980.20210.2025对不同的金属材料应选用不同的旋合比，建议选用范围如下：粉末合金或铸铁5065%冷轧钢板6570%铝材7080%金属薄材8095%.6钢板孔径及抽牙高不同规格自攻螺钉所需钢板预制孔孔径及抽牙孔高呎寸如下(单位inch)：钢板厚度 T0.020.030.040.060.09螺纹标志抽牙孔孔径D6-320.1180.1200.1180.1210.1190.1220.1200.1230.1220.1258-320.1

34、440.1460.1440.1470.1450.1480.1460.1490.1470.15010-240.1630.1650.1630.1660.1640.1670.1650.1680.1660.17010-320.1700.1720.1700.1730.1710.1740.1720.1750.1730.17612-240.1890.1910.1890.1920.1900.1930.1910.1940.1920.196板厚T (inch)0.0240.0350.0420.0480.0600.0900.1060.122孔径D (inch)HRHRHRHRHRHR0.0810.1000.0400.0050.0400.0050.0400.0060.0430.0100.1010.1300.0470.0050.0470.0050.0470.0060.0520.0100.0