Custom Partial Thread Socket Shoulder Bolts

 

These custom partial thread socket shoulder bolts were manufactured for our automotive customer using 18-8 stainless steel material and cold formed 3/16 hex socket drive.  Approximately .50" of 5/16-18 thread was incorporated and the shoulder measured .312" in diameter at 1.25" in length.  The threaded section was turned down prior to thread roll operation.  

Custom Dual Shoulder Screws In 316 Stainless Steel Material

These custom dual shoulder screws were manufactured domestically using 316 stainless steel material with plain finish for our medical device customer.  M4-0.7 thread was incorporated at the end of the custom screw with a ball point.  Two raised shoulders were incorporated with the outside diameter of both at .153 +/- .005" - the captive areas between the shoulders were set to an outside diameter of .133 +/- .005".  The head measured .270" X .198" with a standard slotted drive.

Custom Captive Shoulder Screws - 18-8 Stainless Steel Material

These custom captive shoulder screws were manufactured using a modification to a COTS part for our defense customer using 18-8 stainless steel material with standard 2-56 3A thread and standard socket head dimensions.  Length underneath the head was designed to .750" +/- .005" and the shoulder was turned to a diameter of .052-.054", at a length of .066" +/- .005".  The thread had to be chased for each part to ensure smooth thread transitions after the additional shoulder was incorporated.

Custom Captive Shoulder Screws - Flat Socket Head In 302HQ DFARS Material

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.