... based auto lathes, and many other facilities such as drilling machine, grinding machine, threading machine, etc.Our manufacturing Capability:Turning Drilling Milling Knurling ... Threading Tapping slotting .... OD Φ0.5~Φ25mm, length 2mm~70mm, precision ... . Finish: Ni, Zn, Ag, Ti, Cu, Au... Plating coupling nut