2a thread class right-hand 0.292" thread length flat chamfer head style 24 thread quantity per inch six drilled holes in head passivate surface treated unc thread series
3a thread class right-hand 0.186" thread length flat countersunk head style 40 thread quantity per inch kel-f strip type locking element passivate surface treated unjc thread series
3a thread class right-hand 0.312" thread length knurled no. 6 head style 32 thread quantity per inch navy special project passivate fastener surface treated unf thread series
5a nut thread thread class right-hand nut thread 3.625" overall length 11 nut thread thread quantity per inch navy special project mil-b-857, type ii, style b; thread length 1.5" unc nut thread thread series