Rod actuator
Ewellix CAHM rod actuator
Heavy industrial rod actuator in the Ewellix range with a family maximum of 50 kN, up to 74 mm/s and 700 mm stroke, offered for 24 V DC, 230 V AC and 3 x 400 V AC supplies.
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Need Ewellix parts, a replacement or another suitable option? Send your part number or describe the application. We’ll review the requirement and help with product selection, sourcing, pricing and lead times.
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Key specifications
| Force (max) | 50,000 N |
|---|---|
| Stroke (max) | 700 mm |
| Linear speed (max) | 74 mm/s |
| Supply | 24 V DC, 230 V AC, 3 x 400 V AC |
Summarised in our own words from Schaeffler AG's published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1
Notes on this data
Family maxima from catalogue LA 1 only.
Specify Motion is not affiliated with Schaeffler AG. Ewellix and CAHM are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Ewellix CAHM replacement and alternative options
Use these supply-network options as a starting point for an engineering check. We can also help source the original Ewellix part. Published series figures do not establish an exact-model or drop-in replacement: confirm ratings, fit, interfaces and approvals for your application.
Heavy-duty version of the RSA rod actuator with roller-screw options, matched angular-contact bearings and larger motor mounts, reaching 58 kN on size 64.
| Published maximum | CAHM | RSA-HT (high thrust) |
|---|---|---|
| Force | 50,000 N | 58,000 N meets or exceeds |
| Stroke | 700 mm | 1,524 mm meets or exceeds |
| Speed | 74 mm/s | 3,124 mm/s meets or exceeds |
High-force planetary roller-screw (and ball-screw) rod actuator from 89 kN (RSX10) up to 445 kN (100,000 lbf, RSX50) series maximum, positioned as a direct hydraulic cylinder replacement, with oil-cooled and food-grade versions.
| Published maximum | CAHM | RSX Extreme Force |
|---|---|---|
| Force | 50,000 N | 445,000 N meets or exceeds |
| Stroke | 700 mm | 1,500 mm meets or exceeds |
| Speed | 74 mm/s | 760 mm/s meets or exceeds |
Compact C7 ballscrew linear module with built-in guide, matched to 100-400 W servo motors from the main Japanese and Taiwanese brands.
| Published maximum | CAHM | BLM Built-in Linear Module |
|---|---|---|
| Force | 50,000 N | — |
| Stroke | 700 mm | 1,250 mm meets or exceeds |
| Speed | 74 mm/s | 1,600 mm/s meets or exceeds |
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
Typical applications
What a rod actuator is
A rod actuator, sometimes called an electric cylinder, converts motor rotation into linear thrust through a screw and nut inside a tube, pushing a rod in and out like a pneumatic or hydraulic cylinder. The screw is usually a ball screw for efficiency, a roller screw for heavy loads or a lead screw for low cost. The rod is guided by bearings in the tube and an anti-rotation feature, and the motor is mounted inline or folded alongside through a belt or gear stage.
When engineers choose a rod actuator
Choose a rod actuator when the load is guided externally and needs pushing or pulling with controlled force, speed and position, typically to replace a pneumatic or hydraulic cylinder. It brings programmable positions, force control and energy savings. The trade-offs are side load and cost: the rod is not meant to carry significant radial load, and peak force for its size is lower than hydraulics. If the load needs carrying and guiding along the stroke, a rodless actuator or stage is usually better.
How to specify the Ewellix CAHM
Send these with your enquiry and an engineer can confirm the right CAHM variant or an equivalent:
- Force: peak and continuous or RMS (N)
- Stroke (mm) and retracted length limits
- Speed and acceleration (mm/s, m/s²)
- Duty cycle or full motion profile
- Positioning repeatability (mm)
- Side load and mounting arrangement: trunnion, clevis or flange
- Motor and feedback preference, and environment (IP code, °C)
Common mistakes to avoid
- Sizing on peak force alone instead of RMS force over the cycle
- Rigidly mounting both ends so misalignment puts side load on the rod
- Ignoring critical speed and column buckling on long strokes
- Forgetting that a ball screw back-drives, so vertical loads need a brake
Ewellix CAHM: frequently asked questions
Can you help replace Ewellix CAHM or source the original?
Send the full model code, quantity and required date. Our engineers can check original-part availability and assess suitable alternatives, including Motion Control Products options where appropriate. We confirm compatibility and any changes needed before recommending a replacement.
What is the Ewellix CAHM?
Heavy industrial rod actuator in the Ewellix range with a family maximum of 50 kN, up to 74 mm/s and 700 mm stroke, offered for 24 V DC, 230 V AC and 3 x 400 V AC supplies. Published series figures include force 50,000 N, stroke 700 mm, linear speed 74 mm/s. It is made by Schaeffler AG; Specify Motion can help source it or propose an equivalent.
Who makes the Ewellix CAHM?
The Ewellix CAHM is made by Ewellix (Schaeffler AG) and is listed here for engineers comparing options. Specify Motion is not affiliated with Schaeffler AG; brand names are used only to identify the product.
What is the force of the Ewellix CAHM?
The published series maximum force is 50,000 N. Individual models and sizes in the CAHM range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the Ewellix CAHM?
We can assess suitable replacement options. On published figures, Tolomatic RSA-HT (high thrust) and Tolomatic RSX Extreme Force are options to assess from our supply network. An engineer confirms the fit against your application before recommending anything.
What is the difference between a rod actuator and a rodless actuator?
A rod actuator pushes and pulls a rod extending from its body, so it suits loads that are guided by the machine, much like a cylinder. A rodless actuator moves a carriage along the body and carries the load itself, which handles moment loads and long strokes within the actuator's own length. Pick rod for thrust and rodless for carrying.
Can an electric rod actuator replace a hydraulic cylinder?
Often, yes, especially where force needs are moderate and precise positioning, cleanliness or energy savings matter. Electric rod actuators with roller screws reach high forces, but extreme forces in a small envelope still favour hydraulics. Compare peak and continuous force, duty, shock loads and space, and check the motor and drive sizing as well as the screw.
Further reading: How to size a linear actuator · Hydraulic to electric actuator · Linear actuators
Other rod actuator series
Engineer support
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Tell us how you use the Ewellix CAHM: the load, speed, duty and environment. Our engineers will confirm whether it is still the right part, find it for you, or propose an alternative that fits better.
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