Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6-4X1-9-20B8 found under O Ring by Trelleborg Sealing Solutions Conde. The National Stock Number assigned to this part is 5331142929092, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 6-4X1-9-20B8.