Helicoil screw thread inserts helicoil wire thread inserts

Steps to Install a Heli-Coil

By aceubanks
  • 1. Prepare the surface for drilling

    1. Prepare the surface for drilling

    • The surface must be smooth so the drill will go in straight. Be sure to saw off the old stud and file it flat (as close to the case as possible). Be careful not to remove any metal from the case.
  • 2. Center punch the stud

    2. Center punch the stud

  • 3. Drill a hole with a diameter specified by the installation set

  • 4. Apply cutting oil to the tap

    4. Apply cutting oil to the tap

    • This helps with the removal of the ‘swarf’ (shavings).
  • 5. Cut or ‘tap’ new threads into the hole

    5. Cut or ‘tap’ new threads into the hole

  • 6. Remove all swarf

    6. Remove all swarf

  • 7. Thread the Heli-Coil insert onto the installation tool

    7. Thread the Heli-Coil insert onto the installation tool

    • Notice how the inserts "tang" is hooked against one of the raised lands of the tool end.
  • 8. Apply adhesive to Heli-Coil

    8. Apply adhesive to Heli-Coil

    • Most mechanics recommend to put Loctite onto the outer threads of the heli-coil to strengthen its bonding.
  • 9. Use the installation tool to thread the insert into the recently enlarged and tapped hole

    9. Use the installation tool to thread the insert into the recently enlarged and tapped hole

    • Go until the top of the insert is flush with the part (unless the heli-coil is longer than the hole is deep).
  • 10. Remove the installation tool

    10. Remove the installation tool

  • 11. Shear off the tang

    11. Shear off the tang

    • Insert a punch against the bend of the tang (blue arrow) and hit the punch to shear off the tang. You could also insert the bolt and allow it to shear off the tang.