Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D21-023996 ITEM 19 found under Plate Retaining Bearing by Western Sky Industries Inc. The National Stock Number assigned to this part is 3110013535230, 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 D21-023996 ITEM 19.