knurls

There are lots of advantages by cold extrusion for straight knurl nut in a single process.

直纹滚采用冷挤压一次成形新工艺 ,成效显著。

Abstract： There are lots of advantages by cold extrusion for straight knurl nut in a single process.

摘 要： 直纹滚采用冷挤压一次成形新工艺，成效显著。