Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SL 1620 12 found under Bearing Sleeve by Symmco Inc. The National Stock Number assigned to this part is 3120016596555, 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 SL 1620 12.