Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 121728WS found under Seal Plain Encased by Applied Industrial Technologies. The National Stock Number assigned to this part is 5330009250596, 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 121728WS.