3a thread class right-hand 0.563" grip length 32 thread quantity per inch 108000 single pounds per square inch shear strength cadmium surface treated unjf thread series
3a thread class right-hand 0.453" thread length flat countersunk head style 28 thread quantity per inch cadmium screw surface treated unjf thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.563" grip length ns" letters after the material code "b" indicate no preference to lock type (may be visible or internal) . rivets with no letter code (indicating visible lock type) chromate sleeve surface treated
3a thread class right-hand 0.338" thread length pan no. 2 head style 2.115" grip length 32 thread quantity per inch internal drive ribbed cadmium surface treated unjf thread series
3a thread class right-hand 0.324" thread length oval countersunk head style 0.812" grip length 32 thread quantity per inch internal drive ribbed unjf thread series
3a thread class right-hand 0.323" thread length oval countersunk head style 0.625" grip length 32 thread quantity per inch internal drive ribbed unjf thread series