IN-20 INTRODUCTION - STANDARD BOLT TORQUE SPECIFICATIONS STANDARD BOLT TORQUE SPECIFICATIONS IN008-02 HOW TO DETERMINE BOLT STRENGTH Mark | Class | Mark | Class Hexagon head bolt Bolt head No. 4— 4T 5— 5T 6— 6T 7— 7T 8— 8T 9— 9T 10— 10T 11— 11T Stud bolt No mark 4T No mark 4T Hexagon flange bolt w/ washer hexagon bolt No mark 4T Grooved 6T Hexagon head bolt 2 protruding lines 5T Hexagon flange bolt w/ washer hexagon bolt 2 protruding lines 6T Welded bolt Hexagon head bolt 3 protruding lines 7T 4T Hexagon head bolt 4 protruding lines 8T V00078