Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SP1937 found under Packing Preformed by Stop Choc Limited. The National Stock Number assigned to this part is 5330001554692, 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 SP1937.