We had approximately 1,300 pieces of these custom 316 stainless steel shoulder bolts produced domestically in the USA with thread locking patch. The shoulder measured 3/8" by 1" in length and the thread was rolled to 5/16-18. Full certs were provided with the parts and the lead time was approximately 8-10 weeks from order confirmation.
Engineered Source Inc
Custom 316 Stainless Steel Shoulder Bolts & Related Products