RRH-Series Hollow Plunger Hydraulic Cylinders are ideal for tensioning, testing, pulling, and lifting applications. The hollow bore, base threaded holes and collar thread allow attachments that enable the cylinder to deliver both pull and push forces.
RRH double-acting center-hole hydraulic cylinders feature two connection ports to provide hydraulic flow to both advance and retract the plunger. This provides a more controlled retraction than single-acting cylinders.
Cylinders in the RRH-Series are constructed from high-alloy steel and finished with a baked enamel exterior coating. Collar threads and base holes for easy fixturing are provided as standard.
RRH-Series Hollow Plunger Hydraulic Cylinders are ideal for tensioning, testing, pulling, and lifting applications. The hollow bore, base threaded holes and collar thread allow attachments that enable the cylinder to deliver both pull and push forces.
RRH double-acting center-hole hydraulic cylinders feature two connection ports to provide hydraulic flow to both advance and retract the plunger. This provides a more controlled retraction than single-acting cylinders.
Cylinders in the RRH-Series are constructed from high-alloy steel and finished with a baked enamel exterior coating. Collar threads and base holes for easy fixturing are provided as standard.
Enerpac has designed and manufactured 10,000 psi (700 bar) high-pressure hydraulic cylinders for many decades. We use only the highest quality materials to ensure they can withstand the most demanding applications. All RRH cylinders meet the safety standards required for high-pressure hydraulic tools.
100-ton pulling, pushing, and lifting capability:
Built for heavy industrial load handling where high force and long travel are required.
Hollow plunger design:
Allows rods, cables, anchor studs, and tension bars to pass through the cylinder — ideal for pulling, tensioning, and anchor testing.
Double-acting operation:
Hydraulic extension and hydraulic retraction provide faster cycling, better control, and superior reliability in vertical, horizontal, or inverted orientations.
Long 10.13″ stroke:
Suitable for applications requiring substantial movement under continuous hydraulic control.
Industrial-grade durability:
Heat-treated steel body and piston ensure long life under extreme loads, side stresses, and high-pressure environments.
Enerpac couplers and porting:
Standard CR-400 high-pressure couplers provide compatibility across Enerpac pumps and hoses.
Requires a double-acting hydraulic pump:
Two hoses must be connected — one for extension and one for pressurized retraction.
Larger size & weight:
Long-stroke, high-tonnage cylinders are heavier and bulkier than compact versions.
Center-hole diameter constraints:
Ensure the pull rod or tension bar fits the plunger opening for your application.
Strict alignment required:
Loads must be centered to avoid uneven wear or side-loading damage.
More hydraulic connections:
Double-acting cylinders require careful hose routing and secure fittings due to dual-port operation.
Post-tensioning and cable tensioning work
Bridge and structural anchoring applications
Anchor bolt pull testing (construction & geotechnical)
Heavy machinery disassembly requiring long, straight pulls
Industrial pulling/pressing where center-hole access is necessary
Offshore, mining, and refinery operations requiring controlled long-stroke movement
Lifting or positioning heavy loads when through-rod capability is required
Ensure cylinder sits on a solid, stable, and level surface to maintain centerline alignment.
Use hoses, pumps, and fittings rated for 10,000 psi double-acting operation.
Protect hoses from path-of-travel pinch points during stroke movement.
Confirm the pull rod or cable is properly aligned within the hollow piston before pressurizing.
Bleed air from both hydraulic ports to maintain smooth, predictable motion.
Regularly inspect seals, ports, and piston surfaces — long-stroke double-acting cylinders cycle under higher stresses.
Follow all Enerpac guidelines for loading, setup, and safety — improper alignment or overloading can be hazardous at 100-ton force levels.
Center hole cylinder rentals provide access to specialized equipment for project-specific needs without the cost, storage, or maintenance requirements of ownership.
Center hole cylinders are fully compatible with standard 10,000 PSI hydraulic systems from Enerpac, Simplex, and Power Team when properly matched.
Center hole cylinders allow precise tensile force to be applied directly along the bolt axis, ensuring accurate preload without inducing bending or misalignment.
Center hole cylinders typically require a compatible hydraulic pump, hoses, pressure gauge, and appropriate threaded adapters or fixtures.
