Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B21331-502 found under Cable Assembly Radio Frequency by Massa Products Corporation. The National Stock Number assigned to this part is 5995000219262, and the Federal Supply Class is 5995 Cable Cord And Wire Assemblies Communication Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B21331-502.