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惠式螺纹（旧英制牙）山数节距换算表规格钻头径A例B例山数(25.4)*W1\8-402.652.6100*W5\32-323.253.2880*w3\16-243..753.7772W1\4-205.1564W5\16-186.6560W3\8-1686.556W7\16-149.47.948W1\2-1210.79.310.544W9\16-1212.31240W5\8-1113.713.536W3\4-1016.716.532W7\8-919.519.328W1-822.42224W1\8-72524.820W11\428.32818W13\8-630.530.316W11\2-633.833.514W15\8-53635.713W13\4-539.23912W11\8-541.841.511W2-41\24544.710牙套螺纹攻用9规格钻头径下孔径8上限下限7M3*0.53.13.23.126M4*0.74.24.34.175M5*0.85.25.335.1641\2M6*16.36.426.254M8*1.258.48.528.3131\2M10*1.510.510.6210.3731\2M10*1.2510.410.5210.313M10*110.310.4210.2527\8M12*1.7512.512.7312.4323\4M12*1.512.512.6212.3725\8M12*1.2512.512.5212.3121\2M14*214.514.8314349M14*1.514.514.6214.37M16*216.516.8316.49M16*1.516.516.6216.37M18*2.51919.0418.58M18*1.518.518.6218.37M20*2.52121.0420.58
