Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 17316SS1 420E found under Screw Machine by Promptus Electonic Hardware Inc. The National Stock Number assigned to this part is 5305016154674, 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 17316SS1 420E.