3a nut thread thread class right-hand nut thread 0.500" stud thread thread length 1.250" overall length 20 stud thread thread quantity per inch stud end min first thread cadmium surface treated uns stud thread thread series
flush countersunk head style 0.188" grip length 0.246 in. to 0.249 in. dia by 0.562 in. lg unthreaded stud extending beyond head cadmium surface treated