螺纹攻牙底孔对照表

　1、适用范围　　　　本规范适用于公所有产品内螺纹的加工及检测。　　　2、加工要求　　　　1、内螺纹分公制内螺纹与英制内螺纹。　　　　2、内螺纹的攻牙底孔，见表1、表2。螺纹规格M1×0.25M1.1×0.25M1.2×0.25M1.4×0.3M1.6×0.35底孔孔径0.750.850.951.11.25螺纹规格M1.7×0.35M1.8×0.35M2×0.4M2.2×0.4M2.3×0.4底孔孔径1.351.451.61.751.9螺纹规格M2.5×0.45M2.6×0.45M3×0.5M3×0.6M3.5×0.6底孔孔径2.12.22.52.42.9螺纹规格M4×0.7M4×0.75M4.5×0.75M5×0.8M5×0.9底孔孔径3.33.253.84.24.1螺纹规格M6×1M7×1M8×1.25M9×1.25M10×1.5底孔孔径566.87.88.5螺纹规格M11×1.5M12×1.75M14×2M16×2M18×2.5底孔孔径9.510.3121415.5螺纹规格M20×2.5M22×2.5M24×3M27×3M30×3.5底孔孔径17.519.5212426.5螺纹规格M33×3.5M36×4M39×4M42×4.5M45×4.5底孔孔径29.5323537.540.5螺纹规格M48×5////底孔孔径43////螺纹规格N0.1-81N0.2-56N0.3-48N0.03-56N0.4-40底孔孔径1.551.82.12.12.3表1　公制螺纹攻牙底孔对照表表2　英制螺纹攻牙底孔对照表第2页，共3页螺纹规格N0.5-40N0.6-32N0.8-32N0.10-24N0.10-32底孔孔径2.62.83.43.83.8螺纹规格N0.12-24.1/4-205/16-183./8-163/16-14底孔孔径4.55.16.68.29.4螺纹规格1/2.-13.6/16-12.5/8-11.3/4-10.7/8-9底孔孔径10.812.213.516.519.5螺纹规格.11/8-7.11/4-7.13/8-6.11/2-6.13/4-5底孔孔径2528.230.83439.53、质量检验　　1、产品加工内螺纹时，应分清楚：加工后是否需要进行电镀处理。　　2、镀前用相应规格“6Ｇ”的螺纹塞规进行检验，保证通规通，止规止的要求。　　3、镀后用相应规格“6Ｈ”的螺纹塞规进行检验，保证通规通，止规止的要求。第3页，共3页