3a thread class right-hand 0.425" thread length flat countersunk head style 28 thread quantity per inch internal drive has a reduced size torq-set recesss passivate surface treated unjf thread series
3a thread class right-hand 0.693" thread length flat chamfer head style 11 thread quantity per inch side of head may be plain or knurled. threads oil surface treated unrc thread series
2a thread class right-hand 0.560" thread length flat chamfer head style 20 thread quantity per inch shoulder undercut under head, 0.015 in. wide x 0.020 in. deep unc thread series
2a thread class right-hand 0.110" thread length flat chamfer head style 56 thread quantity per inch threads undercut for relief, 0.0675 in. dia., porm 0.0025 in., 0.030 in. max. width passivate surface treated unjc thread series
2a thread class right-hand 0.340" thread length flat countersunk undercut head style 32 thread quantity per inch threads undercut to 0.118 in. dia. for relief, 0.040 in. wide passivate surface treated unc thread series
2a thread class right-hand 0.2188" thread length flat chamfer head style 32 thread quantity per inch screws shall be necked under shoulder. screws may be necked under head. passivate surface treated unf thread series
2a thread class right-hand 0.1250" thread length flat chamfer head style 40 thread quantity per inch threads undercut for relief.shoulder may be undercut under head at option of manufacturer passivate surface treated unc thread series
2a thread class right-hand 0.1563" thread length flat chamfer head style 32 thread quantity per inch screws shall be necked under shoulder. screws may be necked under head. passivate surface treated unc thread series
