Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 142987 found under Seal Plain by Still W M And Sons Ltd. The National Stock Number assigned to this part is 5330121521186, 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 142987.