
Hydraulic Nut PG9
Axial Bolt Tensioning using High-Pressure Hydraulic
Cost-reducing - Powerful - Reusable



Basic setup
Screw the Hydraulic Nut (HM) on the bolt to be pretensioned, and down to the flanges' surface. A hydraulic high-pressure generator pumps the oil through a high-pressure hose into the space between cylinder and piston. The hydraulic pressure rises.

Piston

Bolt to tension

Cylinder

Bolt elongation
Through the rising pressure and the resulting axial force, the bolt is elongated and the flange parts are compressed. The lock nut is lifted off the cylinder. When the preset pre-tensioning force is achieved, the pressure supply is stopped.

Locking Nut

Screwing the lock nut
The pre-tensioning force has been achieved and the lock nut is turned by hand down to the stop face of the cylinder. Thus, the pre-tensioning force is maintained within the screw joint and the hydraulic may be released. The Hydraulic Nut remains on the bolt connection.
Advantages
Features HM PG9
- hydraulic pre-tensioning force application for short bolt threads
- light construction type
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Areas of Application

Quality Assurance
All Bolt Tensioning Tools and Hydraulic Nuts are checked for material quality, dimensional accuracy, proper operation, and pressure resistance. They are subject to quality assurance measures during order execution and delivered with detailed documentation.

Services
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