3a nut thread thread class right-hand nut thread 1.000" nut thread thread length 7.125" overall length 12 stud thread thread quantity per inch 0.188 in. dia, 0.250 in. deep hole located 0.375 in. from stud end w/0.1883 in. to 0.1885 in. dia nylok insert included zinc surface treated uns stud thread thread series