These custom knurled shoulder bolts are the result of the tests we ran with different knurling methods mentioned in one of the previous posts.  Parts came out perfectly but we did run into some challenges with the lead times, being behind initial expectations due to tooling delays early in the process. 41L40 material was used with heat treat and zinc plated finish.  1/4-20 thread is incorporated at 1" in length and the shoulder measures at 5/16 diameter by 1/2" in length.  The head is at 3/16" in height and 9/16" in diameter.