Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2QU121 found under Tension Spring Asse by Mack Trucks Inc. The National Stock Number assigned to this part is 3040015534895, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 2QU121.