2a thread class right-hand 1.500" thread length fillister head style 24 thread quantity per inch cadmium or zinc screw surface treated unc thread series
3a nut thread thread class right-hand nut thread 0.500" stud thread thread length 2.140" overall length 28 stud thread thread quantity per inch navy special project 2nd shoulder on nut end 0.380 in. dia 0.250 in. lg cadmium surface treated shouldered unf nut thread thread series