This process is a deformation process. It is applied at the bottom of the work billet. It is a cold forming process which is used because cylindrical parts – such as the remaining bottom round part of the bolt can be easily have thread by tolling work billet through two dies.https://cglegal.com/hcnvir8
http://grasshoppersoccer.com.au/yg6erdq We have thread rolling machine of various sizes and capacities. Currently we are having capacity to carry our rolling process in single pass and can roll the size above it by doing in the multiple passes without damaging the threads.