We had 10,000 pieces of these custom coupling nuts with nylon patch produced for our customer using 18-8 stainless steel material with partial internal thread. The drilled hole depth was at 19MM max and 16MM of that depth was to be threaded. Across the flats measures .500" and overall length at 1.5". The undrilled side required a 45 degree chamfer resulting in a .40" diameter round base. Nylon patch was applied at 180 degrees after the first 2 threads.
We supplied our long time medical device customer 2,500 pieces of these tricky custom stainless slotted pins. Production was done domestically using 416 stainless steel material - the original design called out for 17-4PH stainless steel material but that was found to be unnecessary for the relatively simple application. 416 SS provided a much more cost effective and faster alternative while still providing the "spring" action required when the four petals were contracted. 10 pieces were provided out of the production batch for testing and approval before the balance was completed with the slotting process.