Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A003 found under Bearing Ball Annular by West Coast Machine Tools Inc. The National Stock Number assigned to this part is 3110005555233, and the Federal Supply Class is 3110 Bearings Antifriction Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A003.