Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12-501-250 found under Parts Kit Bearing Replacement Mechanical Equipment by Mico Inc. The National Stock Number assigned to this part is 3120014258667, 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 12-501-250.