We provided our gun manufacturing customer these custom torx drive socket head bolts per print using 416 stainless steel material heat treated to HRC 36-44.  Approximately 13.8MM of 1/4-28 2A thread was rolled on both the 34.31MM and 43.61MM overall length version we had manufactured and the unthreaded shoulder diameter was set to 6.35MM +.00/-.22MM.  The head profile and countersink was customized to our customer's specifications.