英制螺纹规格(BA、R、BSW、BSF、BSPP、BSPF 名义尺⼨⼤径螺距每英⼨⽛数 中径⼩径⽛型⾼底孔直径BA mm mm tpi mm 外螺纹H1 mm d=D p d2=D2d3No. 14BA 10.23110.40.860.720.140.75No. 13BA 1.20.25101.6 1.050.90.150.95No. 12BA 1.30.2890.71 1.130.960.171No. 11...