公制粗螺纹美制粗螺纹规格标准径2级牙钻孔径规格(UNC)标准径2级牙钻孔径最大最小最大最小M1.0×0.250.750.7850.729NO.1-64(1.854)1.551.5821.425M1.1×0.250.850.8850.829N
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