Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HL640-8-10 found under Pin Rivet Threaded by M F Services Inc. The National Stock Number assigned to this part is 5320013017443, and the Federal Supply Class is 5320 Rivets. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HL640-8-10.