Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number GS551C3-554 found under Screw Shoulder by Pilgrim Screw Corporation. The National Stock Number assigned to this part is 5305013139327, 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 GS551C3-554.