Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6B3125 found under Roller Linear Rotar by Mpb Corporation. The National Stock Number assigned to this part is 3120012679887, 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 6B3125.