圆柱管螺纹圆板牙
round die for straight pipe threading
内螺纹圆锥销
Taper pins with internal thread
unhardened
虚拟圆锥螺纹量规
virtual gauge for conical thread
公制细螺纹板牙
die for metric fine thread
英制标准螺纹板牙
die for English standard thread
英制螺纹板牙
inch screw die
die for English standard thread
GK型等强钢筋锥螺纹接头
GK-type same-strength conical twisted splice