We had 15,000 pieces of these custom automotive ball studs produced in 1215 medium carbon steel material with heat treatment to achieve 25-34 HRC hardness.  10-32 thread (2A fit) was rolled for these parts and the hex was made to .311″ across the flats.  Overall length of the part measured .815″ and the ball diameter was set to .25″.  Type II zinc yellow electroplated finish was done to complete the production process and the full volume was split across 4 scheduled releases over a 9 month period.  Full certs were included with the shipment per our customer’s strict requirements.