Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number U5MB0025 found under Parts Kit Bearing R by Perkins Engines Inc. The National Stock Number assigned to this part is 3120016235186, 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 U5MB0025.