Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 31857 found under Packing Preformed by Rolls Royce Power Engineering Plc. The National Stock Number assigned to this part is 5330013064629, 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 31857.