Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number XED21012 REV D ITEM 20 found under Bearing Ball Annula by Reuland Electric Co. The National Stock Number assigned to this part is 3110016317709, 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 XED21012 REV D ITEM 20.