3a thread class right-hand 0.322" grip length 28 thread quantity per inch 108000 single pounds per square inch shear strength cadmium surface treated unjf thread series
3a thread class right-hand 0.560" thread length flat countersunk head style 1.802" grip length 20 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 1.375" thread length flat chamfer head style 0.061" hole diameter 28 thread quantity per inch cadmium surface treated unrf thread series