2a thread class right-hand 0.250" thread length fillister head style 0.062" hole diameter 20 thread quantity per inch first dia from head threaded 1/4-20 unc-2a passivate surface treated unc thread series
2a thread class right-hand 0.190" thread length pan no. 2 head style 32 thread quantity per inch navy special project nickel surface treated unc thread series
2a thread class right-hand 0.110" thread length fillister head style 0.037" hole diameter 40 thread quantity per inch cadmium or zinc surface treated unc thread series
2a thread class right-hand 0.130" thread length flat chamfer head style 40 thread quantity per inch navy special project passivate surface treated unc thread series
2a thread class right-hand 0.187" thread length double chamfer head style 32 thread quantity per inch 35 pitch 90 deg diamond knurl head passivate surface treated unc thread series
3a thread class right-hand 0.418" thread length flat chamfer head style 20 thread quantity per inch casehardening pertains to lg from largest bearing surface of head to end of first dia cadmium surface treated unf thread series
2a thread class right-hand 0.149" thread length pan no. 2 head style 32 thread quantity per inch navy special project passivate surface treated unc thread series
2a thread class right-hand 0.146" thread length flat countersunk head style 48 thread quantity per inch navy special project passivate surface treated unc thread series
