3a thread class right-hand flat countersunk head style 28 thread quantity per inch cadmium screw surface treated altered nas 1102-4. edges of head may be rounded absolute min head dia 0.442. unjf thread series
3a thread class right-hand flush countersunk head style 0.620" grip length 28 thread quantity per inch 125000 single pounds per square inch shear strength cadmium surface treated unjf thread series
3a thread class right-hand 0.403" thread length flat countersunk head style 0.240" grip length 28 thread quantity per inch aluminum surface treated unjf thread series
3a thread class right-hand 0.403" thread length flat countersunk head style 0.740" grip length 28 thread quantity per inch aluminum surface treated unjf thread series
3a thread class right-hand 1.125" thread length flat chamfer head style 16 thread quantity per inch aluminum fastener surface treated unrc thread series