Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 51012-4-007 found under Bearing Plain Self by Erie Engineered Products Inc. The National Stock Number assigned to this part is 3120014512042, and the Federal Supply Class is 3120 Bearings Plain Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 51012-4-007.