ITH Type ES

The ITH Type ES is a single-stage bolt tensioning cylinder with one piston surface and automatic piston return, built for high bolting cycles. Its compact design suits applications with axially limited but radially free space. The cylinder is threaded onto the bolt, and hydraulic pressure from an ITH pump creates torsion- and friction-free elongation, with pressure directly proportional to the bolt’s preload force.

How It Works

• The cylinder is threaded onto the bolt using a hand torque wrench or battery nut runner.
• An ITH high-pressure pump applies calculated pressure, elongating the bolt without torsion or friction.
• Once the target pressure is reached, the nut is tightened down under controlled torque.
• Releasing the pressure completes the cycle, leaving accurate, repeatable preload.

Key Features

• Patented safety fracture device protects against overpressure.
• Automatic piston return speeds up cycling between bolts.
• Interchangeable parts suit different thread and nut profiles.
• Direct gear drive with internal gear and spring-loaded turning sleeve for fast, accurate nut engagement.
• Stroke limitation (over-stroke limiter) and a control notch support safe, repeatable operation.
• Patented safety carrying handle and cycle counter track tool use and support maintenance management.
• Optional chrome-nickel NIOX coating adds extra corrosion protection.

Typical Applications

• Flange and pressure vessel bolting
• Foundation bolts
• Wind turbine blade bearing connections
• Structural steel connections requiring axially limited, radially free access
• Multi-tensioning setups for simultaneous flange cover bolting

ITH Type ES Specifications