M/M 机械螺丝 2A (60°)M/M 机械螺丝 2A (60º)规格牙距P外径（D）辗造径规格牙距P外径（D）辗造径MAXMINMAXMINMAXMINMAXMINM40.53.973.863.623.58M20.41.981.891.721.69M4.50.54.474.364.124.08M2.30.42.282.192.021.99M50.54.974.864.624.58M2.50.4