We had 24,000 pieces of these custom metric 316 stainless shoulder bolts manufactured for our design and construction customer. The shoulder measured 4MM by 3MM and M3 X 0.5MM thread was incorporated at 5MM in length, including the relief shoulder transition. Head diameter was at 6MM and a 2MM hex socket drive was cold formed.
Engineered Source Inc
Custom Metric 316 Stainless Shoulder Bolts & Related Products