3a nut thread thread class right-hand nut thread 0.203" stud thread thread length 1.156" overall length 40 nut thread thread quantity per inch undercut to root dia 0.047 in. lg betweeen shoulder tin surface treated shouldered unc nut thread thread series
2a nut thread thread class right-hand nut thread 1.188" nut thread thread length 16 nut thread thread quantity per inch 0.562 dia drill point countersunk on stud end 0.094 in. lg by 0.625 in. dia thread relief on nut end unf nut thread thread series
2a nut thread thread class right-hand nut thread 0.698" nut thread thread length 4.100" overall length 11 nut thread thread quantity per inch navy special project both ends thd releived 0.062 in. w by 0.031 in. deep shouldered unc nut thread thread series
2a nut thread thread class right-hand nut thread 0.150" stud thread thread length 1.272" overall length 40 nut thread thread quantity per inch hex shoulder 0. 060 in. lg at ea end of 0.125 in. dia shank, distance between bearing surface ea hex 0.500 in. porm .002 unc nut thread thread series
Used on aircraft, hercules c-130. 2a nut thread thread class 32 nut thread thread quantity per inch cadmium surface treated shouldered unc nut thread thread series