Patents Assigned to Tri-State Tool & Die
  • Method and apparatus for fabricating one piece all metal prevailing torque locknut fasteners
    Patent number: 5791997
    Abstract: Method and apparatus for modifying conventional internally threaded nut blanks to form one piece all metal prevailing torque locknut fasteners having uniform, repeatable torque characteristics when engaged with conventional bolt threads.
    Type: Grant
    Filed: October 25, 1996
    Date of Patent: August 11, 1998
    Assignee: Tri-State Tool & Die
    Inventors: John Alan Barney, Erich Pansegrau