3a thread class right-hand 0.443" thread length double hexagon w/hole head style 28 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.526" thread length double hexagon w/hole head style 24 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.751" thread length spline drive shear head head style 18 thread quantity per inch passivate surface treated unjf thread series