2a thread class right-hand 0.309" thread length 0.471" overall length w/two 0.156 in. w by 0.125 in. dp slots 180 deg apart on top of nut hexagon, external thread, boss
3a thread class right-hand 0.360" thread length 0.655" overall length hex end counter sunk 28 deg min, 32 deg max, to 1.190 in. min, 1.200 in. max dia passivate surface treated hexagon, external thread, boss
right-hand 0.233" thread length 0.355" overall length three holes drilled through hexagon corners 0.039 in. min, 0.044 in. max hexagon, internal thread, shouldered