Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number N3-21570 PIECE 416 found under Bearing Sleeve by Diamond Power International Inc. The National Stock Number assigned to this part is 3120012107973, 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 N3-21570 PIECE 416.