rollers threading machine this model is the special equipment to process through bolt ranging from 4-16mm.when dealing with clamping bolt,not only has the work efficieng doubled but also the quality increased byovercoming under gauge.the through bolt is widely used for mechanical installation,air conditioner mounting and communications equipment fitting. parameters: working dia:4-16mm OD of roller:120-170mm BD of roller:54mm roller width max:100mm dip angle of main shaft:+-5degree center distance of main shaft:120-240mm rotary speed of main shaft:36,47,60,78(r/min) main power:4kw thread length:no limits weight:1500kg