Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4020-39 found under Ring Wiper by Strohmeyer Julie A. The National Stock Number assigned to this part is 5330005298876, 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 4020-39.