... thread rolling machine. Diameter:5-40mm Pitch:0.4-2.5mm Length:50-100mm FR40*100 thread rolling machine, steel pipe making machine, ... the work pieces real roundness when by rolling.2, Fixed Roll/ Pass two applied.3, Adopt Taiwanese ... is optional.7, rolling shape: rolling thread, textured, ruled, rolling light, cross knurling, roll bars, rolling groove, and roll-offQuality Process Certifications: ...