flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.157" grip length 2700 double pounds per square inch shear strength locking feature 3 spherical indentatiions 120 deg apart on periphery of shank passivate surface treated
3a thread class right-hand 0.505" grip length 28 thread quantity per inch 95000 single pounds per square inch shear strength cadmium surface treated unjf thread series
3a thread class right-hand 0.630" grip length 28 thread quantity per inch 95000 single pounds per square inch shear strength cadmium surface treated unjf thread series
3a thread class right-hand 0.443" grip length 32 thread quantity per inch 125000 single pounds per square inch shear strength cadmium surface treated unjf thread series