3a thread class right-hand 1.615" grip length 20 thread quantity per inch 108000 single pounds per square inch shear strength cadmium surface treated unjf thread series
3a thread class right-hand 0.476" thread length pan no. 2 head style 0.615" grip length 24 thread quantity per inch internal drive ribbed unjf thread series
3a thread class right-hand flush countersunk head style 0.802" grip length 24 thread quantity per inch 108000 single pounds per square inch shear strength cadmium surface treated unjf thread series
2a thread class right-hand 3.529" thread length flat countersunk head style 13 thread quantity per inch passivate screw surface treated unc thread series