Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SRF 4-40X3 8 found under Screw Machine by A P M Hexseal Corporation. The National Stock Number assigned to this part is 5305013074796, and the Federal Supply Class is 5305 Screws. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SRF 4-40X3 8.