Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MS51961-1 found under Bearing Roller Needle by Society Of Automotive Engineers Inc. The National Stock Number assigned to this part is 3110002273234, 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 MS51961-1.