duo series multi-stage tensioners are versatile and reliable hydraulic bolt tensioners suitable for high load and tight space applications. Optimized for use on wind turbines they have been designed for long-life, low maintenance use, and are suitable for use on single bolts, or grouped together for multiple tightening of bolted joints. duo tensioners are extensively used for slewing rings, power-gen applications, structural and all critical bolting.

Options and Features

• Special threads
• Special load requirements
• Twin or single port
• Protective handle
• Special bridge for tight clearance
• Swivel connections
• Cycle counter
• Gear drive nut run-down
• Spring piston return
• Misalignment compensation
• ARMOURMAX anti-corrosion, anti-wear surface finish

Safe and Reliable

• CE marked
• Over-stroke protection
• Max stroke indicator
• Pressure Test Certification
• Full colour operating and safety manual

Latest Technology

• Latest seal technology
• High cycle life
• Optimized load to weight ratio
• Integrated system with TensionPro pumps and hoses