gqnAAA螺丝攻牙钻孔径和滚丝径对照表

螺丝攻牙钻孔径和滚丝径对照表公制粗螺纹UNC规格标准径2级牙钻孔径SizeStandardHole ID of Class 2 thread 最大最小MaxMinM1.0×0.250.75 0.785