Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number XM31-B1816-8 OXYGEN CLEAN found under Retainer Ring Assembled Nut by Rix Industries. The National Stock Number assigned to this part is 5340016716790, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like XM31-B1816-8 OXYGEN CLEAN.