m12螺栓扭矩标准
螺栓扭矩表 强 螺栓规格 Nm M4 M5 M6 (M7) M8 M10 M12 (M14) M16 (M18) M20 (M22) M24 (M27) 1.0 1.8 2.8 4.9 7.8 14.7 24.5 39.2 61.0 84.0 121.0 164.0 208.0 314.0 4.6 Ft-tb 0.7 1.3 2.1 3.6 5.8 10.8 18.1 28.9 45.0 62.0 89.2 121.0 153.4 231.6 5.6 (A4-50) Nm 1.3 2.5 3.9 6.9 9.8 19.6 33.4 54.0 82.0 114.0 163.0 221.0 282.0 422.0 Ft-tb 1.0 1.8 2.9 5.1 7.2 14.5 24.6 39.8 60.5 84.1 120.2 163.0 208.0 311.3 6.9 (A4-70) Nm 2.4 4.7 7.8 12.8 19.6 39.2 58.0 108.0 167.0 231.0 324.0 432.0 559.0 824.0 (单位:Nm、Ft-tb) Nm(牛m)=0.73756Ft-tb(英尺磅) 度 等 级 8.8 (A4-80) Nm 2.8 5.6 9.8 15.7 24.5 44.1 78.5 128.0 196.0 260.0 373.0 500.0 638.0 961.0 Ft-tb 2.1 4.1 7.2 11.6 18.1 32.5 57.9 94.4 144.6 191.8 275.1 368.8 470.6 708.8 Nm 3.9 7.8 13.7 22.6 34.3 63.8 113.0 181.0 267.0 366.0 525.0 711.0 903.0 1354.0 10.9 Ft-tb 2.9 5.8 10.1 16.7 25.3 47.1 83.3 133.5 196.9 269.9 387.2 524.4 666.0 998.7 Nm 4.9 9.3 15.7 26.5 39.2 78.5 137.0 216.0 320.0 439.0 628.0 853.0 1079.0 1638.0 12.9 Ft-tb 3.6 6.9 11.6 19.5 28.9 57.9 101.0 159.3 236.0 323.8 463.2 629.1 795.8 1208.1 Ft-tb 1.8 3.5 5.8 9.4 14.5 28.9 42.8 79.7 123.2 170.4 239.0 318.6 412.3 607.7 M30 (M33) 422.0 579.0 311.3 427.0 569.0 785.0 419.7 579.0 1109.0 1511.0 818.0 1114.5 1315.0 1795.0 969.9 1323.9 1844.0 2531.0 1360.1 1866.8 2217.0 3021.0 1635.2 2228.2
作者:admin　1/4—20UNC是美制粗螺纹,公称外径为6.35mm,螺距1.27,二级精度的牙,外径最大为6.322,最小为6.11　美制螺纹8-32unc参数:公称直径4.166mm,牙数32,牙高0.472mm,螺距0.784mm,外螺纹外径最大4.14274mm,外螺纹外径最小3.99034mm,外螺纹中径最大3.62712mm,外螺纹中径最小3.55346mm,外螺纹小径最大3.19786mm,内螺纹小径最小3.302mm,内螺纹小径最大3.5306mm,内螺纹中径最小3.64998mm,内螺纹中径最大3.7465mm,内螺纹外径最小4.1656mm,钻孔3.4544mm。　美制螺纹底孔直径计算方法:美标内螺纹孔径d=25.4*公称直径D-25.4/牙数例如:UNC1/2“美标粗牙螺纹,螺距一寸13牙。公式:d=25.4*1/2-25.4/13=12.7-1.95=10.75(mm)即:该内螺纹的孔径为10.75毫米