Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 921 48 found under Dampener Vibration by Perkins Engines Inc. The National Stock Number assigned to this part is 2815016036847, and the Federal Supply Class is 2815 Diesel Engines And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 921 48.