Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 343SP31 found under Retainer Packing by Mack Trucks Inc. The National Stock Number assigned to this part is 5330003532465, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 343SP31.