2a thread class right-hand 0.750" thread length hexagon head style 20 thread quantity per inch locking element in accordance with mil-f-18240 except prevailing passivate fastener surface treated unc thread series
2a thread class right-hand 0.625" thread length hexagon head style 0.045" hole diameter 20 thread quantity per inch coat in accordance with mil-c-85614 using alumizite "z", supplied by tiodize, cage 34568 unc thread series
3a thread class right-hand 0.400" thread length dished hexagon head style 0.928" grip length 28 thread quantity per inch passivate surface treated unjf thread series