Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MB-2001M found under Bearing Set by Jpi Transportation Products Inc. The National Stock Number assigned to this part is 3120004099973, 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 MB-2001M.