3a thread class right-hand 0.183" thread length headless (setscrew) head style 56 thread quantity per inch navy special project passivate surface treated unf thread series
3a thread class right-hand flush countersunk head style 0.271" grip length 40 thread quantity per inch 95000 single pounds per square inch shear strength unjf thread series
3a thread class right-hand 0.380" grip length 32 thread quantity per inch 108000 single pounds per square inch shear strength cadmium or cadmium surface treated unjf thread series
3a thread class right-hand 1.125" thread length headless (setscrew) head style 20 thread quantity per inch navy special project nonstandard point concave to 0.750 in. radius cadmium surface treated unef thread series