Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MS31997 found under Bearing Roller Cylindrical by Regal Beloit Corp. The National Stock Number assigned to this part is 3110002750169, 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 MS31997.