Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number QSB 5.9 230HD SO81945 found under Engine Diesel by Cummins Inc. The National Stock Number assigned to this part is 2815016040676, 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 QSB 5.9 230HD SO81945.