Ex:3/8x0.50UNF-PPB:3分细牙螺丝钉x0.50”长,PPB. 或以英制外径表示,. 如0.086-56,0.112-40,0.138-32,0.164-32,0.190-24…etc. Ex:632-8-PPB. ***英制螺丝外径和长度长度 ...
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