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。表1 公制螺纹攻牙底孔对照表螺纹规格底孔孔径螺纹规格底孔孔径螺纹规格底孔孔径螺纹规格底孔孔径螺纹规格底孔孔径螺纹规格底孔孔径螺纹规格底孔孔径螺纹规格底孔孔径螺纹规格底孔孔径M1×0.250.75M1.7×0.351.35M2.5×0.452.1M4×0.73.3M6×15M11×1.59.5M20×2.517.5M33×3.5M1.1×0.250.85M1.8×0.351.45M2.6×0.452.2M4×0.753.25M7×16M12×1.7510.3M22×2.519.5M36×4M1.2×0.250.95M2×0.41.6M3×0.52.5M4.5×0.753.8M8×1.256.8M14×212M24×321M39×4M1.4×0.31.1M2.2×0.41.75M3×0.62.4M5×0.84.2M9×1.257.8M16×214M27×324M42×4.5M1.6×0.351.25M2.3×0.41.9M3.5×0.62.9M5×0.94.1M10×1.58.5M18×2.515.5M30×3.526.5M45×4.529.5M48×532//35//37.5//40.5//43表2 英制螺纹攻牙底孔对照表螺纹规格底孔孔径N0.1-811.55N0.2-561.8N0.3-482.1N0.03-562.1N0.4-402.3第2页，共3页螺纹规格底孔孔径螺纹规格底孔孔径螺纹规格底孔孔径螺纹规格底孔孔径N0.5-402.6N0.12-244.51/2.-1310.8.11/8-725N0.6-322.8.1/4-205.1.6/16-1212.2.11/4-728.2N0.8-323.45/16-186.6.5/8-1113.5.13/8-630.8N0.10-243.83./8-168.2.3/4-1016.5.11/2-634N0.10-323.83/16-149.4.7/8-919.5.13/4-539.5 3、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
