This part is very much like the 6-32 X 1/4 vented socket cap screw shown in an earlier blog and this special invar part was also purchased by a university student at a relatively small quantity. In quantities of 20-100 pieces the lead time for special socket cap screws with these parameters is approximately 1-2 weeks, with rush service available upon request.
Engineered Source Inc
Supplier and Distributor of Fasteners & Related Products
Santa Ana - Orange County - Los Angeles - Inland Empire - San Diego - Southern California - Cont. United States - Mexico