HEICO-Tec®
Tension Nut
For a secure joint with a HEICO-TEC® Tension Nut, no electric, hydraulic, or pneumatic tools are needed. All you need is a torque wrench.
The HEICO-TEC® Tension Nut is unique in the fact that the pretension force of the large main thread is distributed to many smaller pressure bolts. Because the pressure bolts are smaller, a conventional torque wrench can be used to achieve the correct pretension force. This eliminates the need for complex, bulky, or heavy tools and makes securing large bolted joints more convenient and easy.
HEICO-TEC® Tension Nuts in strength class 8 and 10 meet all the requirements of ISO 898-2 which enables you to easily replace any hex nut from the same strength class while also offering all the advantages of a hand-tightened nut.
Our standard program of HEICO-TEC® Tension Nuts offers you the following advantages:
- Fast delivery: On stock and therefore directly available
- Compatible with DIN EN ISO 898-2: Direct replacement of hex nuts from the same strength class possible
- Extended service through consultation as well as installation aids for technical documentation (e.g. assembly template)
Functional Principle
HEICO-Tec® Tension Nuts
- The nut body (1) is screwed onto the main thread just like a conventional nut – but is not tightened.
- 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.
- The hardened incorporated load bearing washer (3) protects the tensioned parts from high pressure loads caused by the pressure pins.
Fields OF APPLICATION
Steel industry
Heavy industry
Power generation
