Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NO 1203 SERIE 12 found under Bearing Ball Annular by Bremen Bearing Co. The National Stock Number assigned to this part is 3110005546083, 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 NO 1203 SERIE 12.