Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number K81210A found under Bearing Ball Annular by Electric Apparatus Co. The National Stock Number assigned to this part is 3110001556259, 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 K81210A.