Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HD6 5 16 18X8CRES found under Screw Cap Socket Head by Flowserve Corporation. The National Stock Number assigned to this part is 5305012706929, 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 HD6 5 16 18X8CRES.