Design and Function of the
HEICO-TEC® Tension Nut

Aufbau und Funktion


  1. The nut body (1) is screwed onto the main thread just like a conventional nut – but is not tightened.

  2. Several pressure bolts (2a) with associated pressure pins (2b) are arranged around the main thread inside the nut body. When the pressure bolts are tightened, they push the pressure pins against the part to be tensioned and at the same time the bolt elongates. The pretension force created in this way is purely axial and therefore free from harmful torsion or bending.

  3. The hardened incorporated load bearing washer (3) protects the tensioned parts from high pressure loads caused by the pressure pins.