2a thread class right-hand 0.313" thread length thumb no. 1 head style 20 thread quantity per inch undercut unthreaded portion 0.180 in. dia by 0.312 in. long passivate surface treated unc thread series
3a thread class right-hand 0.375" thread length flat countersunk head style 24 thread quantity per inch side height of head 0.125 in. min, 0.149 in. max cadmium surface treated unc thread series
3a thread class right-hand 0.422" thread length hexagon head style 5.625" grip length 20 thread quantity per inch cadmium surface treated unf thread series
2a thread class right-hand 0.526" thread length flat countersunk head style 32 thread quantity per inch cadmium screw surface treated unc thread series
3a thread class right-hand 0.276" thread length pan head style 0.235" grip length 32 thread quantity per inch cadmium surface treated unjc thread series
3a thread class right-hand 0.250" thread length flat countersunk head style 0.240" grip length 32 thread quantity per inch cadmium surface treated unc thread series
3a thread class right-hand 0.380" thread length 2.460" overall length 28 thread quantity per inch surface machined to 125 microinches; the unthreaded shank is min. 0.369 in. unf thread series
