xiaoming201_ren 发表于 2009-6-10 18:07:35

建议改为:
Thereisthreadingonhalfdeephole.

xiubin 发表于 2009-6-11 14:07:23

wefindonlyoneholethreaded,other3areevenwithoutthreading
页: 1 [2]
查看完整版本: 1/4 20 drill & tap 既然有tap 应该是打孔并攻罗纹吧?可是样品没有罗纹