2a thread class right-hand 14 thread quantity per inch with hole drilled through center of nut 0.688 id, top of nut is countersunk 60 degree angle oxide surface treated
2b thread class right-hand 11 thread quantity per inch coated, metallic-ceramic, mil-c-81751, type 1, class 4, 0.001 in. min, 0.002 in. max thk outer surfaces, 0.0005 in. in, 0.0008 in. max thk on thds, before inal sealer coating chromate surface treated
