Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C31-21145 found under Bearing Roller by Brunswick Corporation. The National Stock Number assigned to this part is 3110011245694, 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 C31-21145.