We had 25,000 pieces of these custom automotive ball studs produced in 1215 steel material with heat treat hardening to 25-34 HRC and zinc yellow finish.  The across the flats dimension on this ball stud was set to measure .311 +/-.01".  Overall length measured .975" with the 1/4-28 thread taking up approximately .400".  We supply this ball stud on revolving annual blanket order basis with the initial production lead time at 4-5 months from order confirmation.