Used on 6115-01-561-7788 generator set, diesel engine. 2a thread class right-hand 2 thread quantity per inch nut, heavy hexagon passivate surface treated
3b thread class right-hand 32 thread quantity per inch nut, self-locking, plate - two lug, floating, variable counterbore, replaceable nut element 125ksi 450 degress f cadmium surface treated