Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FST 21A 9 found under Cable Assembly Spec by Thomas And Betts Corp. The National Stock Number assigned to this part is 5995013441657, 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 FST 21A 9.