2a thread class right-hand 0.121" thread length fillister head style 0.030" hole diameter 56 thread quantity per inch passivate screw surface treated unc thread series
2a thread class right-hand 0.185" thread length hexagon extended washer head style 20 thread quantity per inch cadmium surface treated unc thread series
3a thread class right-hand 0.168" thread length fillister head style 0.046" hole diameter 32 thread quantity per inch nickel screw surface treated undercut 0.062 in. long, 0.143 in. min dia, 0.147 in. max dia unf thread series