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ICS25.100.50J41JB/T8824.1－1998统一螺纹丝锥Tapsforunifiedthreads1998-12-29发布1999-07-01实施国家机械工业局发布JB/T8824.1－1998前言本标准参照美国标准ANSIB94.9—1987《切制和磨制丝锥》中统一螺纹丝锥部分制订，型式尺寸与该标准相同。本标准于1998年12月29日首次发布。本标准的附录A是标准的附录。本标准由全国刀具标准化技术委员会提出并归口。本标准主要起草单位：上海刃具厂。中华人民共和国机械行业标准JB/T8824.1－1998统一螺纹丝锥Tapsforunifiedthreads1范围本标准规定了统一螺纹丝锥（以下简称丝锥）的型式、尺寸和标记等的基本要求。本标准适用于加工螺纹代号为No.0～No.12、1/4～121统一螺纹丝锥。2引用标准下列标准所包含的条文，通过在本标准中引用而构成为本标准的条文。本标准出版时，所示版本均为有效。所有标准都会被修订，使用本标准的各方应探讨使用下列标准最新版本的可能性。JB/T8824.2—1998统一螺纹丝锥螺纹公差JB/T8824.3—1998统一螺纹丝锥技术条件3型式和尺寸3.1粗柄丝锥型式按图1所示，尺寸在表1、表2中给出。图1表1mm方头螺纹代号每25.4mm上牙数公称直径d螺距Ｐd1lLL1al2No.1–64UNC641.8540.3979.5342.865.5No.2–56UNC562.8140.45411.1144.45No.3–48UNC482.5150.5293.5812.7046.046.02.794.76国家机械工业局1998-12-29批准1999-07-01实施1JB/T8824.1－1998表1（完）mm方头螺纹代号每25.4mm上牙数公称直径d螺距Ｐd1lLl1al2No.4–40UNC2.85414.2947.63No.5–40UNC403.1750.63515.8849.21No.6-32UNC3.5053.5817.4650.807.02.794.76No.8-32UNC324.1660.7944.2719.0553.988.03.33No.10-24UNC4.8264.9322.233.866.35No.12–24UNC245.4861.0585.5923.8160.339.04.197.14表2mm方头螺纹代号每25.4mm上牙数公称直径d螺距Ｐd1lLl1al2No.0–80UNF801.5240.3187.9441.285.0No.1–72UNF721.8540.3539.5342.865.5No.2–64UNF642.1840.39711.1144.45No.3–56UNF562.5150.45412.7046.046.0No.4–48UNF482.8450.52914.2947.63No.5–44UNF443.1750.57715.8849.21No.6–40UNF403.5050.6353.5817.4650.807.02.794.76No.8–36UNF364.1660.7064.2719.0553.988.03.33No.10–32UNF324.8260.7944.9322.233.866.35No.12–28UNF285.4860.9075.5923.8160.339.04.197.143.2粗柄带颈丝锥型式按图2所示，尺寸在表3、表4中给出。图22JB/T8824.1－1998表3mm方头螺纹代号每25.4mm上牙数公称直径d螺距Ｐd1lLl1al21/4–20UNC206.3501.2706.4825.4063.5011.04.857.945/16–18UNC187.9381.4118.0829.6369.0613.06.059.533/8–16UNC169.5251.5889.6831.7574.6115.07.2611.11表4mm方头螺纹代号每25.4mm上牙数公称直径d螺距Ｐd1lLd1al21/4–28UNF286.3500.9076.4825.4063.5011.04.857.945/16–24UNF7.9388.0829.6369.0613.06.059.533/8–24UNF249.5251.0589.6831.7174.6115.07.2611.113.3细柄丝锥型式按图3所示，尺寸在表5、表6中给出。图3表5mm方头螺纹代号每25.4mm上牙数公称直径d螺距Ｐd1lLal17/16–14UNC1411.1121.8148.2030.5176.996.1510.321/2–13UNC1312.7001.9549.3279.386.9911.119/16–12UNC1214.2882.11710.9042.0791.288.1812.705/8–11UNC1115.8752.30912.1946.0496.849.1414.293/4–10UNC1019.0502.54014.9950.80107.9511.2317.467/8–9UNC922.2252.82217.7056.36119.0613.2819.051–8UNC825.4003.17520.3263.50130.1815.2420.643JB/T8824.1－1998表5(完)mm方头螺纹代号每25.4mm上牙数公称直径d螺距Ｐd1lLal1181–7UNC28.57522.76138.1117.0722.23141–7UNC731.7503.62925.9365.09146.0519.4625.40183–6UNC34.92528.14153.9921.1126.99121–6UNC638.1004.23331.3176.20161.9323.5028.58143–5UNC544.4505.08036.3277.79177.8027.2331.752–421UNC4.550.8005.64441.7680.96180.9831.3234.93表6mm方头螺纹代号每25.4mm上牙数公称直径d螺距Ｐd1lLal17/16–20UNF11.1128.2030.5176.996.1510.321/2–20UNF2012.7001.2709.3279.386.9911.119/16–18UNF14.28810.9042.0791.288.1812.705/8–18UNF1815.8751.41112.1946.0496.849.1414.293/4–16UNF1619.0501.58814.9950.80107.9511.2317.467/8–14UNF1422.2251.81417.7056.36119.0613.2819.051–12UNF25.40020.3263.50130.1815.2420.64181–12UNF28.57522.76138.1117.0722.23141–12UNF31.75025.9365.09146.0519.4625.40183–12UNF34.92528.14153.9921.1126.99121–12UNF1238.1002.11731.3176.20161.9323.5028.583.4单支和成组丝锥适用范围、主偏角、切削锥长度推荐在表7中给出。表7分类适用范围mm名称主偏角Кr切削锥长度l5初锥4°8P中锥8°4P单支和成组（等径）丝锥P≤2.54底锥16°2P第一粗锥5°30′6P第二粗锥8°4P成组（不等径）丝锥P2.54精锥16°2P4JB/T8824.1－19983.5丝锥公称切削角度，在径向平面内测量，推荐如下：a)前角γP为8°~10°；b)后角αP为4°~6°。3.6标记示例右旋粗牙统一螺纹，螺纹代号为No.5–40UNC，每25.4mm上为40牙，2级公差带，单支初锥（底锥）磨制丝锥：统一螺纹磨制丝锥初（底）5–40UNC–2JB/T8824.1—1998右旋细牙统一螺纹，螺纹代号为5/16–24UNF，每25.4mm上为24牙，两支（初锥和底锥）一组等径切制丝锥：统一螺纹切制丝锥初（底）5/16–24UNFJB/T8824.1—1998右旋粗牙统一螺纹，螺纹代号为3/4–10UNC，每25.4mm上为10牙，3级公差带，三支一组不等径磨制丝锥：统一螺纹磨制丝锥（不等径）3–3/4–10UNC–3JB/T8824.1—1998左旋粗牙统一螺纹，螺纹代号为No.1–64UNC，每25.4mm上为64牙，单支中锥切制丝锥：统一螺纹切制丝锥No.1–64UNCLJB/T8824.1—19984螺纹公差丝锥螺纹公差按JB/T8824.2。5技术条件丝锥技术条件按JB/T8824.3。5JB/T8824.1－1998附录A（标准的附录）螺纹长度l(短型)尺寸表A1丝锥螺纹长度l（短型）尺寸在表A1中给出。表A1螺纹代号每25.4mm上牙数公称直径dmm螺距Pmm螺纹长度lmmNo.0–80UNF801.5240.3187.0No.1–72UNF720.353No.1–64UNC1.8548.0No.2–64UNF640.397No.2–56UNC2.184No.3–56UNF560.454No.3–48UNC2.5159.5No.4–48UNF480.529No.4–40UNC402.8450.635No.5–44UNF440.577No.5–40UNC3.17511.0No.6–40UNF400.635No.6–32UNC323.5050.794No.8–36UNF360.706No.8–32UNC4.16613.0No.10–32UNF320.794No.10–24UNC244.8261.058No.12–28UNF280.907No.12–24UNC245.4861.05816.01/4–28UNF280.9071/4–20UNC206.3501.27019.05/16–24UNF241.0585/16–18UNC187.9381.41122.03/8–24UNF241.0583/8–16UNC169.5251.58824.07/16–20UNF201.2707/16–14UNC1411.1121.81425.06JB/T8824.1－1998表A1（完）螺纹代号每25.4mm上牙数公称直径dmm螺距Pmm螺纹长度lmm1/2–20UNF201.2701/2–13UNC1312.7001.95429.09/16–18UNF181.4119/16–12UNC1214.2882.11730.05/8–18UNF181.4115/8–11UNC1115.8752.30932.03/4–16UNF161.5883/4–10UNC1019.0502.54037.07/8–14UNF141.8147/8–9UNC922.2252.82238.01–12UNF122.1171–8UNC825.4003.175181–12UNF122.117181–7UNC728.5753.62945.0141–12UNF122.117141–7UNC731.7503.62948.0183–12UNF122.117183–6UNC634.9254.23351.0121–12UNF122.117121–6UNC638.1004.23360.0143–5UNC544.4505.0802–421UNC4.550.8005.64467.07JB/T8824.1－1998中华人民共和国机械行业标准统一螺纹丝锥JB/T8824.1－1998*机械工业部机械标准化研究所出版发行机械工业部机械标准化研究所印刷（北京首体南路2号邮编100044）*开本880×12301/16印张3/4字数16,0001999年2月第一版1999年2月第一次印刷印数1－500定价10.00元编号98－216