公制螺纹参数简明表标准螺纹外螺纹大径内螺纹小径M121,25M121,251211,647M121,75M141,51211,376M1421210,106M161,5M1621412,376M181,5M1821411,835M182,5M201,51614,376M202M202,51613,835M221,5M2221816,3761815,8351815,2942018,3762017,8352017,2942220,3762219,835M222,52219,29425,376M271,52724,83523,752M2722728,37627,835M2732726,21131,376M301,53030,83529,211M3023033,83532,752M303,53031,67036,835M331,53335,752...