Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4 40 1 2INSS found under Screw Assemble Wash by Itw Shakeproof Automotive Products. The National Stock Number assigned to this part is 5305009733135, 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 4 40 1 2INSS.