Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HC8 5 16 18X16 found under Screw Cap Socket He by Flowserve Corporation. The National Stock Number assigned to this part is 5305013970372, 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 HC8 5 16 18X16.