Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 15993 PIECE 28 found under Bearing Washer Thrust by Hyde Corp. The National Stock Number assigned to this part is 3120012046742, 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 15993 PIECE 28.