3a nut thread thread class right-hand nut thread 0.875" stud thread thread length 2.750" overall length 11 nut thread thread quantity per inch tapered thread from 0.563 in. min, 0.566 in. max pitch dia at stud end to 0.572 in. min, 0.575 in. max pitch dia at shoulder chromium surface treated unc nut thread thread series