Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21M-85-2 found under Retainer Helical Co by Metrex Valve Corp. The National Stock Number assigned to this part is 5340015125083, 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 21M-85-2.