Used on F-22. 3b thread class right-hand 0.688" thread length 20 thread quantity per inch optional finish-silver plate per ams 2410.inserts made from AMS5734 heat treated to 140 ksi minimun passivate surface treated keylock unjf thread series
3a thread class right-hand 0.625" thread length dee chamfer head style 0.044" hole diameter 36 thread quantity per inch cadmium surface treated unrf thread series
Used on c-135 aircraft. 3a thread class right-hand 0.543" thread length hexagon head style 3.125" grip length 18 thread quantity per inch used on landing gear control valve cadmium surface treated unjf thread series
Used on engine, aircraft, f-108 (cfm-56, kc-135a). 3a thread class right-hand 0.285" thread length 24 thread quantity per inch burrs permissable in serration area; internal thread series designator is unf serrated uns thread series
Used on model t406-ad-400 and model ae2100a, c and model ae2100d2, d3, j aircraft engine. stud, key locked thread series designator 0.3125-18 x 0.250-28
