滚压螺纹 meaning in English

rolled thread

Rolled threads for bolts - lead and runout requirements
螺栓用滚压螺纹.螺纹引导和收尾要求
The machines of this kind is an automatic working equipment which is designed for processing screw thread on the blanks of rivets and lolts with heads . it fits for the mass production of tightening articles
本机型是在带头部的螺钉、螺栓坯件上滚压螺纹的自动化加工设备，适用于紧固件的大批量生产。