Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number GS551B3S6 found under Screw Cap Socket He by Nylok Corporation. The National Stock Number assigned to this part is 5305000011837, 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 GS551B3S6.