Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A0R15783 ITEM 21 found under Bearing Sleeve by Sheffer Corp. The National Stock Number assigned to this part is 3120012286206, 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 A0R15783 ITEM 21.