Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 308972 found under Retainer And Balls Bearing by Bell And Howell Inc. The National Stock Number assigned to this part is 3110001981188, and the Federal Supply Class is 3110 Bearings Antifriction Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 308972.