diameter at bottom of threadminor diameter of screw threadminor diameter of threadthread bottom diameterthread root diameter螺纹: screw thread; flight; helica ...内径: bore size; bore; inradium; i ...外螺纹内径: core diameter螺纹内径, 螺纹底径: bottom diameter变内径内螺纹接头: reducing nipple下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:螺纹内径,即可在微信中查询翻译