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The thread roller ground the blank diameter to the pitch diameter and then rolled the threads. The pitch and major diameters on the parts are correct so there is no room to play with the ground blank diameter.

The part looks like a typical hex head bolt and is 2.800" OAL. The part grew approx. .010-.012 on the OAL after thread roll!! As I said before the thread is 1-3/4" lond but there is a .125 wide diameter smaller than the thread minor on the front end (no threads) so the front ind is not cupped or...

The part is a machined hex head bolt run on a CNC lathe. The print calls out rolled threads only. We do not have an axial thread roll attachment and the run quantity does not justify purchasing one so we must sublet the thread rolling.

Is there a formula to predetermine the linear growth from rolling a thread? I have a part made from 4340 steel that will have a 3/8-24 thread rolled for a length of 1-3/4" and I only have .006" tolerance on the overall length which I am afraid will get longer after the thread is rolled. The...

Does anyone recognize what material grade this is?

I have a round machined part which has 2 features that were drawn 90° apart but had no relationship or tolerance noted. One was a milled flat and the other a drilled hole. We have made many similar parts over the years and always assumed there was no relationship since none was noted and never...