Two-Roll Straightening Machines:: The machines typically apply two large opposite rollers to curve and force the bar. These work best to straighten relatively straightforward bends and are fitted in the majority of bar processing mills.

Multi-Roll Straightening Machines: These apply a succession of rollers, normally in opposite pairs, to apply multiple bending forces to the bar. This allows more accurate straightening and correction of more intricate bends. These are used mainly to high precision applications where highly straight bars are needed.

Finishing: Additional processes like straightening, polishing, or grinding may follow to achieve the desired tolerance, finish, and appearance.

Inspection: Rigorous quality checks ensure that the bar meets specifications for diameter, surface finish, and concentricity.