2a thread class 0.090" thread length flat chamfer head style navy special project pilot hole through slot drive 0.093 in. min, 0.098 in. max hole dia, 0.120 in. deep
3a thread class right-hand 0.720" thread length flat chamfer head style 20 thread quantity per inch head is undercut to accommodate an o-ring passivate surface treated unf thread series
2a thread class right-hand 0.220" thread length pan no. 2 head style 56 thread quantity per inch navy special project passivate surface treated unc thread series
3a thread class 0.565" thread length flat chamfer head style 20 thread quantity per inch portion of shoulder reduced 0.620 in. dia by 1.060 in. w unf thread series
2a thread class right-hand 0.187" thread length flat chamfer head style 24 thread quantity per inch 0.062 in. max undercut between shoulder phosphate surface treated unc thread series
