Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4012-310-1 found under Roller Bearing by Western Sky Industries Inc. The National Stock Number assigned to this part is 3110014222799, 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 4012-310-1.