These are custom drilled socket head cap screws we supplied our customer that specializes in aerospace parts repair. They are made domestically in the USA using 17-4 PH/AMS 5643 material with AMS 2759/3, H1100 (30-37 Rc) heat treat, heavy medium sand blast, and finally passivation. The socket head is drilled in four places at 60 degrees between each pair, using a #56 drill bit at .0465" diameter. The length is set at .635-.615 inches and the 8-32 UNJC-3A threaded section is to be maintained at .510 to .490 inches.
All secondary processes were completed using a NADCAP certified facility and parts were supplied to our customer with certifications for each stage, with a first article inspection report included as well to the customer's specification. Due to it's price and longer lead times this custom drilled socket cap screw is ideal for a 12 month blanket purchase order arrangement where we stock the full usage requirement and release only what the customer needs over the course of the year.
Engineered Source Inc
Supplier and Distributor of Custom Drilled Socket Head Cap Screws & Related Products
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