1、普通螺纹牙距和基本尺寸(GB/T196-1981)公称直径D、d螺距P中径D2或 d2小径D1或 d1公称直径D、d螺距P中径D2或 d2小径D1或 d11 0.25 0.838 0.729 1.5 21.026 20.3761.2 0.25 1.038 0.929 22 2.5 20.376 19.2941.4 0.3 1.205 1.075 2 22.701 21.8351.6 0.35 1.373 1.221 24 3 22.051 20.7522 0.4 1.740 1.567 2 25.701 24.8352.5 0.45 2.208 2.013 27 3 25.051 23.752
2、3 0.5 2.675 2.459 2 28.701 27.8353.5 (0.6) 3.110 2.850 30 3.5 27.727 26.2114 0.7 3.545 3.242 2 31.701 30.8354.5 0.75 4.013 3.688 33 3.5 30.727 29.2115 0.8 4.480 4.134 3 34.051 32.7526 1 5.350 4.917 36 4 33.402 31.6701 7.350 6.917 3 37.051 35.75281.25 7.188 6.647 39 4 36.402 34.6701 9.350 8.917 3 40.
3、051 38.7521.25 9.188 8.647 42 4.5 39.077 37.129101.5 9.026 8.376 3 43.051 41.7521.25 11.188 10.647 45 4.5 42.077 40.1291.5 11.026 10.376 3 46.051 44.752121.75 10.863 10.459 48 5 44.752 42.5871.5 13.026 12.376 (4) 49.402 47.670142 12.701 11.835 52 5 48.752 46.5871.5 15.026 14.376 4 53.402 51.670162 14.701 13.853 56 5.5 52.428 50.0461.5 17.026 16.376 4 57.402 55.670182.5 16.376 15.294 60 (5.5) 56.428 54.0461.5 19.026 18.376 4 61.402 59.6702 18.701 17.835 64 6 60.103 57.505202.5 18.376 17.294注：优先选用不带 直径。
