Used on ch-47 helicopter ft319 unit subassy. 3a thread class right-hand hexagon head style 0.078" hole diameter 0.375" grip length 32 thread quantity per inch zinc surface treated unf thread series
2a thread class right-hand 0.813" thread length 13 thread quantity per inch precision swivel ball that can be used either as a contact bolt or as a rest pad. black oxide finish. unc thread series