Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number QSC-5291-23040 found under by Quality Supply Corporation. The National Stock Number assigned to this part is 5330012778075, 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 QSC-5291-23040.