常用螺纹尺寸尺寸代号 每寸牙数 大径 中径 小径 建议底孔1/8 27 10.242 9.489 8.736 8.61/4 18 13.616 12.487 11.358 11.13/8 18 17.055 15.926 14.797 14.51/2 14 21.223 19.772 18.321 17.93/4 14 26.568 25.117 23.666 23.21 11.5 33.228 31.461 29.694 29.21-1/4 11.5 41.985 40.218 38.451 37.91-1/2 11.5 48.054 46.287 44.520 43.9基准距离 牙数4.102 4.365.786 4.16.096 4.328.128 4.488.611 4.7510.160 4.610.668 4.8310.668 4.83常用螺纹尺寸
