Introduction
Hollow plunger hydraulic cylinders are irreplaceable workhorses across construction, machinery maintenance, energy and metal fabrication industries. Among all mainstream hollow jack ranges, the RRH series remains one of the most widely adopted double-acting hydraulic cylinder models thanks to unified mounting threads, consistent base bolt circle layouts and multiple stroke options covering 30-ton, 60-ton and 100-ton load capacities.
This guide breaks down complete dimensional and thread parameters extracted directly from the official RRH hydraulic cylinder catalog, helping engineers, field technicians and equipment buyers quickly match suitable cylinders for tensioning, pulling, pressing and load testing tasks.
Core Model Lineup & Standard Mounting Specifications
The official RRH catalog sorts all variants by tonnage class, with fixed bolt circle diameters, UNC collar threads and uniform thread depth values for interchangeable fixture installation. Below is the consolidated technical reference table sourced from the product PDF:
1. RRH300 Series (30 Ton Hollow Cylinder)
Model: RRH300-178
Bolt Circle Diameter: 92.2 mm
Collar Thread W: 3/8"-16UNC
Thread Depth: 15.7 mm
2. RRH600 Series (60 Ton Hollow Cylinder)
Covering two standard stroke versions: RRH600-89 and RRH600-166
Universal Bolt Circle Diameter: 130.3 mm
Universal Collar Thread W: 1/2-13UNC
Thread Depth (RRH600-166): 14 mm RRH600-89 shares identical mounting thread and bolt circle dimensions for cross-use attachments
3. RRH1000 Series (100 Ton Hollow Cylinder)
Four standard stroke models: RRH1000-38, RRH1000-76, RRH1000-153, RRH1000-257
Universal Bolt Circle Diameter: 177.8 mm
Universal Collar Thread W: 5/8"-11UNC
Standard Thread Depth: 19 mm All four 100-ton variants share the same base mounting layout, allowing seamless switching between short and long stroke cylinders without reworking custom fixtures.
Why Standardized Thread & Bolt Circle Data Matters for Field Operations
A key advantage of the RRH series highlighted throughout the catalog is standardized mechanical interfaces within each tonnage group, which delivers tangible benefits for end users:
Interchangeable custom fixtures Customers only need to design one set of pulling yokes, tensioning saddles and anchor adaptors per tonnage class, compatible with all stroke lengths of the same series. This cuts down custom machining costs and storage space for workshop attachments.
Fast on-site replacement When a cylinder needs maintenance or replacement on-site, technicians can swap in any same-tonnage RRH model without adjusting mounting frames or bolt alignment.
Simplified engineering design Mechanical designers can reference fixed bolt circle and UNC thread sizes from the catalog when integrating RRH cylinders into stationary test benches, assembly presses and pre-stressing equipment. No repeated dimensional verification for different stroke lengths.
Key Design Features of RRH Hollow Plunger Hydraulic Cylinders
As detailed in the full catalog, the RRH range features double-acting hydraulic retraction, separating it from basic single-acting spring return jacks:
Central hollow through bore: Accommodates tie rods, steel strands, anchor bolts and shafts for both push lifting and pull tensioning operations.
High-pressure rated construction: Built for standard 700 bar (10,000 PSI) hydraulic system operation, constructed with heat-treated alloy steel and hard chrome plunger plating for wear resistance.
Integrated dust wiper and composite sealing system: Minimizes oil leakage and blocks abrasive debris during outdoor construction and workshop heavy-duty cycles.
Built-in safety overpressure valve: Mitigates damage from accidental overload during bolt tensioning, bearing extraction and load testing procedures.
Common Industrial Applications for RRH Series Cylinders
Based on real-world use cases listed in the catalog, these hollow hydraulic cylinders serve diverse heavy-duty sectors:
Civil engineering: Post-tensioning bridge strands, foundation anchor bolt pre-stressing
Heavy equipment maintenance: Bearing removal, shaft press-fitting, gear pulling
Oil & gas pipeline work: Large flange bolt tensioning and alignment
Metal fabrication & workshops: Component straightening, load capacity testing
Shipbuilding & heavy assembly: Structural pulling and position adjustment
How to Utilize the Official RRH Hydraulic Cylinder Catalog
The complete RRH catalog PDF contains far more data beyond bolt circles and thread specs: extended/collapsed overall heights, effective piston area, unit weight, center bore diameter and dimensional line drawings for every model.
Design engineers: Download the catalog to extract exact measurements for CAD modeling and fixture design.
Field technicians: Reference thread depth and UNC thread sizes to match compatible tension nuts and pulling accessories.
Procurement teams: Compare stroke lengths and load capacities to select cost-effective cylinder models for fleet equipment.
Final Words
The RRH hollow plunger hydraulic cylinder series remains a reliable, cost-effective solution for dual-action lifting and tensioning work. Its unified mounting standards across stroke variants streamline equipment design, on-site operation and spare part management. For anyone sourcing industrial hydraulic hollow jacks, cross-checking bolt circle, UNC thread and thread depth data from the official catalog eliminates costly fitting errors and compatibility issues down the line.
