如#2-56,#4-40,#6-32,#8-32,#10-24…etc. Ex:#2-56(0.086-56):2番56牙. Ex:#4-40 ... UNC:粗牙:重机械结构较常用. Ex:3/8x0.50UNF-PPB:3分细牙螺丝钉x0.50”长,PPB. 或以 ...
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