Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21158-0305 found under Seal Plain Encased by Chromex Distribution. The National Stock Number assigned to this part is 5330001541471, 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 21158-0305.