Hollow plunger hydraulic cylinders (also known as center-hole cylinders) feature a piston with a central opening, enabling rods, cables, or bolts to pass through for pulling or tensioning. This hollow design makes them ideal for both pushing and pulling forces.
Enerpac offers these in single-acting and double-acting versions, with return mechanisms that suit applications requiring rapid cycling or sustained pulling force.
These cylinders are used in a wide range of applications across U.S. industries:
Anchor bolt tensioning
Post-tensioning in concrete
Cable tensioning and de-tensioning
Bushing removal or insertion
Bearing maintenance
Heavy-duty pulling operations
The through-hole capability allows direct engagement with threaded rods, allowing force to be applied in either direction for precise control.
To operate efficiently and safely, Enerpac hollow plunger cylinders typically require:
Threaded rods or tensioning bars
Pulling plates or bearing adapters
Hydraulic hand or electric pumps
High-pressure hoses and fittings
Hollow saddles or rod guides
Pulling nuts and reaction washers
Enerpac systems are modular, so components can be mixed and matched to suit your application.
These highly flexible cylinders are widely used in:
Construction & Infrastructure – For cable tensioning and post-tensioning concrete beams
Power Generation – Tensioning anchor bolts in turbines or generators
Mining & Heavy Equipment – Removing pins or installing press-fit parts
Transportation & Rail – Pulley and bushing extraction during maintenance
Manufacturing – For mechanical testing, press fits, and bearing pulls
Enerpac is known for quality and safety. Their hollow plunger models:
Are machined for concentric alignment to ensure accurate tensioning
Offer high-tonnage capacity even in compact models
Are made with corrosion-resistant finishes
Come with built-in handles for portability
Support horizontal or vertical use
They’re also easy to maintain, with seal kits and replacement parts readily available.
Enerpac hollow cylinders are commonly used in geotechnical testing, including pull-out testing for anchors.
Many models have integrated handles for easy maneuvering onsite.
They’re often used with hydraulic nuts in bolting operations for turbine and flange systems.
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Tel: 866-522-5464 Email: hello@wbequipment.com
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