Custom Stainless Shoulder Captive Screws - Cold Drawn 303 SS

 

These custom stainless shoulder captive screws were manufactured using cold drawn stainless steel bar stock material with a cold headed head and drive.  6-32 thread was incorporated at 5mm +/- 0.5, with a lead in chamfer per print.  The head was made to 8mm in diameter and 1.5mm in height, with the step shoulder measuring 3.6 in diameter by 2mm in length.  The long captive shoulder was set to 2.3mm +0/-0.2 diameter.  Overall length is 31.5mm and the head featured a #2 phillips 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.

Custom Stainless Captive Screws - 10-32 X 3/4 In 18-8 Stainless Steel

These custom stainless captive screws were made using standard off the shelf 10-32 X 3/4" fully threaded socket cap screws in 18-8 stainless steel material.  The .130-.150" diameter shoulder was turned down leaving approximately 1/4" of thread at the end of the screw.  With a relatively loose tolerance on the shoulder diameter this job was a relative breeze and our internal part number is GM-1104-I.

Custom Captive Stainless Screws - 10-32 X 1.76 In 18-8 Stainless Steel Material

These are custom captive stainless steel screws we supplied to our construction customer, who refers to them as "Gripper Screws".  Production was done domestically in the USA at approximately 5,000 pieces and a lead time of 6-8 weeks.  The multi-step flat head was made using a cold heading process and the 10-32 thread was rolled at 0.2" in length.  The diameter of the unthreaded shoulder was set at 0.14" +/-.015.