Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21027 found under Bearing Plain Spherical by Drs C3 And Aviation Company. The National Stock Number assigned to this part is 3120004324059, 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 21027.