M3 3.4 6.5 65 13 6.5 M4 4.5 8.0 75 18 8 M5 5.5 9.5 85 22 9.5 M6 6.6 11.0 90 25 11 M8 9.0 14.0 100 28 12 M10 11.0 17.5 110 30 12 M12 14.0 20.0 115 32 12 1/4 6.85 11.0 90 25 11 5/16 8.55 14.0 100 28 12 3/8 10.1 15.0 110 30 12 1/2 13.5 20.0 115 32 12
http://wenku.baidu.com/view/14d85114f18583d0496459f1.html这个你去看看 有帮助没