These custom stainless binding posts were manufactured domestically to our customer's drawing using 18-8 stainless steel material. 8-32 female thread is incorporated with the shoulder diameter at .250" and shoulder length at .250" as well. The dome head was made to a diameter of .406" and head height of .060". For the final application we provided this part with both custom painted heads to match the color and also with black oxide finish.
These custom nickel plated socket head screws were produced domestically using 4340 material instead of the originally requested 17-4PH version, with heat treatment to get the parts up to required 35-45 HRC hardness. 1/2-20 thread with 2A thread fit was incorporated with thread length of .77 inches. Overall length underneath the head was set at 1.37" +.00/-.03". The large .945" diameter head presented a challenge from the start for the cold heading operation - it took multiple sets of tooling and adjustments to finally get the head shape just right.
Slightly over 4,000 pieces of these custom captive shoulder screws were made domestically for our aerospace customer. An MS24671-32 part made using 302HQ DFARS compliant material was used as a base part to create this final version. Part of the 1/4-20 3A thread was turned down to a shoulder diameter of .175" +/-.005 and length of .339" +/- .015. .375" of thread remained after the modification. The resulting captive shoulder screws were then passivated per AMS QQ-P-35 and run through a thread lock patch process per MIL-F-18240.