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Rexroth CDT3MS2 80 45 30Z2X B11HDUMWW Hydraulic Tie-Rod Cylinder
Overview
The Rexroth CDT3MS2 80 45 30Z2X B11HDUMWW is a metric industrial tie-rod cylinder from the Bosch Rexroth CDT3 Series. As a CD double-acting differential cylinder with a single piston rod, it converts hydraulic energy into precise linear mechanical motion. This model is built in compliance with ISO 6020/2, DIN 24554, and NF/ISO 6020/2 standards, ensuring straightforward integration into new or existing hydraulic systems worldwide. The CDT3 series is well known for its high service life, moderate pressure rating, and flexible configuration options, making it suitable for a broad spectrum of medium-duty hydraulic applications.
Technical Features
MS2 Side Foot Mounting (Installation Base) – The MS2 mounting type indicates a foot (side lug) mounting arrangement at the cylinder base. This provides a stable, fixed installation where the cylinder body is securely clamped to the machine frame. The MS2 style is suitable for applications requiring the cylinder to be rigidly mounted without pivoting, while the piston rod end remains free for connection to a moving load. The cylinder is offered in a total of 13 different mounting types (MP5, ME5, ME6, MS2, MT4, etc.), providing broad flexibility for machine designers.
Piston & Rod Dimensions – The cylinder has a piston diameter of 80 mm and a piston rod diameter of 45 mm. The entire CDT3 series supports piston diameters from 25 mm to 200 mm and piston rod diameters from 12 mm to 140 mm, covering a wide range of force and speed requirements.
Stroke Length – The stroke length is 30 mm (Z2X design). The series can accommodate strokes up to 3,000 mm, offering flexibility for long-reach applications.
Component Series 2X (Z2X) – The Z2X designation indicates Component Series 2X (unchanged installation and connection dimensions across series 20 to 29). This ensures interchangeability and backward compatibility with earlier designs of the same family.
Pressure Ratings – The CDT3 series is designed for a nominal working pressure of 160 bar (16 MPa) for all mounting styles under dynamic continuous operation. For static load conditions (fewer than 10,000 load cycles over the cylinder’s lifetime), the permissible maximum working pressure can be up to 210 bar (21 MPa), with a static test pressure of 240 bar (24 MPa). These well-defined ratings make the cylinder suitable for steady but not continuously cycling high-load tasks. The maximum permitted speed is 0.5 m/s.
Hard Chrome-Plated Piston Rod – The piston rod is Type H, featuring a hard chromium-plated surface finish. This provides excellent wear resistance, high surface hardness, and effective corrosion protection (including a 240‑hour salt spray test SST per DIN EN ISO 9227 and a 240‑hour condensation test KKT per DIN EN ISO 6270-2 with a dry film thickness of 40 μm), ensuring a long service life even in demanding or wet environments. The standard primer colour is Gentian blue (RAL 5010) with an R1 Grade I corrosion protection class.
Threaded Piston Rod End – The piston rod end is Type H, featuring a threaded connection (CGAS, KK = M120×4) for attaching a hinge lug (clevis) or other mechanical linkage. This design provides a strong, secure, and serviceable connection point for transmitting actuator forces to the load.
End-Position Cushioning – The cylinder is specified with "U" end-position cushioning, indicating no cushioning is provided. The CDT3 series can optionally be equipped with a progressive damping system on request (Types D = self‑adjusting on both sides, S = self‑adjusting cap side, K = self‑adjusting rod side, or E = adjustable both sides). When used, this cushioning system offers benefits such as progressive deceleration, short damping time, speed‑dependent damping length, low cushioning pressure with no pressure peaks, and accordingly increased safety and lifespan for both the cylinder and the entire machine.
B11 Porting Configuration – The porting is Type B, conforming to ISO 1179‑1 (pipe thread ISO 228‑1) with a port size of G 1½ inches. The B11 designation specifies both the port type and the positions of the pipeline joints on the head and bottom (the second digit “1” indicates one pipeline joint on the head and one on the bottom, both located on the upper side when viewed from the piston rod end).
HDU Sealing Designation – The HDU suffix in the model code defines the sealing configuration and additional options. The “H” designates a hard chrome‑plated piston rod (Type H), the “D” indicates end‑position cushioning type (Type D – self‑adjusting both sides) – though in this specific variant it may be part of the seal/option code, and the “U” stands for standard sealing system suitable for mineral oils HL, HLP, and HFA emulsions. The final “W” denotes no additional options (standard configuration). The cylinder’s high‑quality sealing system ensures minimal leakage, long seal life, and compatibility with a wide range of hydraulic fluids, making it reliable in diverse operating conditions.
Robust Tie‑Rod Construction – The cylinder employs a lightweight yet durable tie‑rod design. The precisely machined, one‑piece cylinder head integrates the piston rod guide socket. This integrated design simplifies servicing and significantly extends service life — reportedly up to five times longer than conventional tie‑rod cylinders.
Operating Temperature Range – The cylinder is designed to operate reliably across a wide range of temperatures, from approximately -45°C to +93°C (-50°F to +200°F), supporting use in both cold outdoor and hot industrial environments.
Key Functionalities
Reliable Linear Force Conversion — As a double‑acting differential cylinder, it efficiently converts hydraulic pressure and flow into linear force and motion. Direction of motion is controlled by pressurising either the cap side (extension) or the rod side (retraction), enabling precise bidirectional positioning of machine elements.
Controlled Stroke Management — The 30 mm stroke length is short yet well suited for applications requiring a controlled, limited linear displacement. When differential operation is used (pressurising both the cap side and the rod side with flow from the annular area redirected to the cap side), the cylinder can achieve faster extension speeds, reducing cycle times and improving machine efficiency.
Smooth Deceleration via Progressive Damping System (Optional) — Although this variant has no cushioning, the CDT3 series is capable of a progressive damping system whose main advantages are progressive deceleration, short damping time, speed‑dependent damping length, and low cushioning pressure with no pressure peaks. Where fitted, the damping system smoothly decelerates the piston as it approaches the stroke end, eliminating impact and shock loads that otherwise damage both the cylinder and the machine frame. This significantly increases safety and extends the service life of the entire equipment.
Self‑Adjusting Cushioning — Where Type D (self‑adjusting, both sides) is specified, the cushioning automatically adapts to changes in speed and load without requiring manual readjustment, simplifying installation and reducing commissioning time.
Excellent Wear and Corrosion Resistance — The combination of a hard chrome‑plated piston rod, robust tie‑rod construction, and R1 corrosion protection (240‑hour salt spray and condensation tests) ensures high resistance to wear, corrosion, and environmental contaminants. This prolongs the cylinder’s operational life and reduces the need for frequent servicing.
Flexible Installation — The MS2 side foot mounting provides a stable, fixed mounting arrangement for machines where the cylinder body does not need to pivot. The threaded piston rod end (Type H, KK = M120×4) allows easy attachment of various clevis joints or custom linkages, providing installation flexibility.
Low Maintenance & Long Service Life — The integrated one‑piece guide socket simplifies maintenance access. The high‑quality seals, hard chrome finishing, and vibration‑reducing progressive damping system (where fitted) all contribute to a long service life and low total cost of ownership. Routine inspection of seals and connections is required.
Sealing Integrity & Fluid Compatibility — The HDU designation’s sealing system (Type U) is specifically designed for compatibility with mineral oils (HL, HLP) and HFA emulsions, ensuring minimal external leakage, consistent performance over a wide temperature range, and reduced system contamination.
Application Sectors
The Rexroth CDT3MS2 80 45 30Z2X B11HDUMWW hydraulic cylinder is designed for a wide range of medium‑duty industrial and mobile applications requiring reliable linear force delivery, corrosion resistance, and flexible installation. The CDT3 series is widely used across numerous sectors:
Machine Tools & Metalworking – CNC machine tools (clamping units, tool changers), milling and machining centre axis control, small presses, die‑casting machines, and automated workholding systems. The cylinder’s stable MS2 mounting and pressure ratings up to 160 bar (210 bar static) make it well suited for precision positioning of moderate loads in machine shop environments.
Industrial Automation & General Manufacturing – Automated assembly lines, pick‑and‑place units, transfer systems, palletisers, and general factory automation where compact dimensions and reliable actuation are required. The cylinder’s corrosion protection and 30 mm stroke allow it to perform repetitive tasks with low maintenance.
Construction Equipment – Small‑sized excavators, compact loaders, backhoes, and telescopic handlers for boom, arm, and bucket actuation. The HDU sealing system, hard chrome‑plated rod, and R1 corrosion protection ensure reliable operation in dusty or damp outdoor conditions.
Agricultural Machinery – Combine harvesters (header elevation, reel drive), feed mixers, hydraulic steering systems, and crop sprayers. The progressive damping system (where fitted) reduces shock during end‑of‑stroke motion, protecting linkages and improving operator comfort.
Mining & Material Handling – Conveyor systems, feeder drives, material transfer stations, screening equipment, and small‑capacity bucket elevators. The cylinder’s rating for static loads up to 210 bar (with reduced lifecycle load cycles) makes it suitable for intermittent or low‑duty mining support applications. The MS2 foot mounting provides robust attachment to fixed frames.
Marine & Offshore Deck Machinery – Small hatch covers, winch braking systems, steering gear, and hydraulic cylinder controls on small vessels or offshore service equipment. The cylinder’s high corrosion protection class (R1, 240‑hour salt spray) is particularly valued in wet, salt‑spray marine environments.
Food Processing & Packaging Machinery – Bottle filling machine actuators, food product pushers, packing line diverters, carton erectors, and film sealing presses. The cylinder’s smooth, low‑leakage operation and choice of food‑grade compatible sealing options (where required) make it suitable for food contact applications.
Medical Equipment – Patient lifts, hospital bed positioning systems, surgical table adjusters, and rehabilitation equipment requiring quiet, smooth, precise, and low‑leakage operation. The cylinder’s high reliability and low maintenance fit the demanding uptime requirements of medical devices.
Energy & Power Generation – Small dam gate actuators, valve controls for hydroelectric systems, solar tracker positioning units, and wind turbine yaw brakes. The wide operating temperature range (-45°C to +93°C) and corrosion resistance allow the cylinder to perform reliably in outdoor renewable energy installations.
Rubber & Plastics Processing – Small injection moulding machine clamping units, blow‑moulding equipment shutters, tyre curing press actuators, and rubber extruder components. The cylinder’s differential performance contributes to faster cycle times and reduced energy use.
Ceramic & Brick Pressing – Ceramic tile presses, brick moulding machines, and refractory material forming equipment, where repeated, accurate, medium‑force actuation is required.
Paper & Pulp Industry – Paper roll handling, stacking equipment guides, slitter‑rewinder push bars, and pulp moulding press actuators. The cylinder’s minimised leakage helps maintain clean hydraulic systems in paper manufacturing.
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Bosch Rexroth |
| Series | CDT3, Tie‑rod design, Component Series 2X |
| Model Code | CDT3MS2 80 45 30Z2X B11HDUMWW |
| Cylinder Type | CD – Double‑acting single‑rod differential cylinder |
| Action | Double‑acting |
| Mounting Type | MS2 – Installation base (side foot, fixed) |
| Piston Diameter (Bore) | 80 mm |
| Piston Rod Diameter | 45 mm |
| Stroke Length | 30 mm |
| Nominal Pressure (Continuous, Dynamic) | 160 bar (16 MPa) |
| Maximum Pressure (Static Load) | 210 bar (21 MPa) |
| Static Test Pressure | 240 bar (24 MPa) |
| Maximum Permitted Speed | 0.5 m/s |
| Applicable Standards | ISO 6020/2, DIN 24554, NF/ISO 6020/2 |
| Design Principle | Z – Cylinder head and bottom connected by tie rods |
| Component Series | 2X (unchanged dimensions 20 to 29) |
| Piston Rod Type | H – Hard chrome‑plated |
| Piston Rod End | H – Threaded for hinge lug (CGAS, KK = M120×4) |
| End‑Position Cushioning | U – None (optional Types D, S, K, E available) |
| Port Type | B – ISO 1179‑1 (pipe thread ISO 228‑1), G 1½ |
| Pipeline Joint Positions (Head & Bottom) | 1 (head) / 1 (bottom) – upper side viewed from piston rod end |
| Corrosion Protection | R1 Class, Grade I (240h salt spray, 240h condensation, 40 μm dry film) |
| Standard Finish | Gentian blue primer (RAL 5010) |
| Fluid Compatibility | Mineral oils (HL, HLP), HFA emulsions |
| Fluid Cleanliness Requirement | ISO 4406 (c) class 20/18/15 |
| Operating Temperature | −45°C to +93°C (approx.) |
| Cylinder Weight | Approx. 25–30 kg (based on 80 mm bore iron tie‑rod construction) |
Conclusion
The Rexroth CDT3MS2 80 45 30Z2X B11HDUMWW is a well‑engineered metric tie‑rod hydraulic cylinder from Bosch Rexroth’s proven CDT3 Series. Its MS2 side foot mounting, double‑acting differential design, and compliance with ISO 6020/2, DIN 24554, and NF/ISO 6020/2 ensure global mechanical compatibility and straightforward integration into new or existing systems.
The 80 mm piston, 45 mm rod, and 30 mm short stroke make this variant particularly suitable for medium‑duty applications requiring a stable, fixed installation with precise but limited linear displacement. The hard chrome‑plated rod and R1 corrosion protection provide reliable wear and corrosion resistance, even in wet or dusty conditions. The HDU sealing designation ensures compatibility with standard mineral oils and HFA emulsions, offering minimal external leakage and long seal life.
Although the U‑type end‑position cushioning in this variant means no deceleration damping is fitted, the CDT3 series as a whole — and many variant models — can be equipped on request with a progressive damping system (Types D, S, K, or E). Where installed, this system provides smooth, shock‑free deceleration at stroke end, reduces impact loads, and extends the life of both the cylinder and its mechanical linkages.
With pressure ratings of 160 bar dynamic continuous, 210 bar static maximum, and 240 bar static test, the cylinder is well suited for steady‑state, limited‑cycle, or infrequently cycling applications across machine tools, industrial automation, small construction equipment, agricultural machinery, marine deck equipment, renewable energy installations, and paper/pulp processing.
As a proven, reliable, and energy‑efficient linear drive solution, the Rexroth CDT3MS2 80 45 30Z2X B11HDUMWW offers an excellent balance of durability, corrosion resistance, and maintenance‑friendly design for medium‑duty hydraulic applications worldwide.
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