All benefits of the IHF Stretch System at a glance

• Torsion-free, friction-free system
• No bending or torsion stresses inside of the bolt because of the method
• Higher utilization of the yield strength
• Exact implementation of the pre-tensioning forces
• High reproducibility of the pre-tensioning force
• Easy and worksafe and faster mounting procedures – in-field tests have proven to be faster than common torqueing methods
• Use of smaller bolt dimensions on equal pre-tensioning forces
• Small bolting tool dimensions
• Easy and simple mounting procedure

• Less maintenance costs: “Maintenance free bolting”
• Less material costs: Reduction of the flange dimensions
• Less fastener costs (when choosing smaller bolt diameters)
• Less bolting tool costs
• Less installation costs by a faster installation process
  • Less working staff costs
  • Less peripherical costs (energy, rental costs of machines and equipment, transport, running expenses)

The IHF Stretch System is certified by the follwing quality management systems and institutes:

• European Technical Approval (ETA) from the German Institute of Construction Technology (Deutsches Institut für Bautechnik
• ETA covers production, fasteners, IHF Stretch System
• In-field approval by the DN VGL (merged cooperation of the former certification insitutes Det Norske Vertias and Germanischer Lloyd)