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.
Need this part, a replacement or a complete package? Our experienced UK engineering team helps you select, source and obtain the right products, with pricing, delivery coordination and after-sales support.
Pricing and availability
Get pricing, sourcing and replacement support
Need Ewellix parts, a replacement or a suitable alternative? Send us a part number, or tell us what the machine needs to do. Our UK engineers will come back with the right product, pricing, lead time and delivery, whether that is the original part, a checked alternative or a complete axis.
- Original parts or a checked alternative
- Pricing, lead time and delivery in one reply
- Components, complete axes and ongoing support
No obligation. Add what you know and an engineer will help with the rest. Prefer to configure it? Build a specification.
Spec builder
Specify what you need instead of CAHM
Select every part you need and answer the questions an applications engineer would ask. Our engineers use your specification to come back with the right products, pricing and lead times. You see your summary before we ask for any details.
Already know the part number? Send it to us directly.
- 1Products
- 2Performance
- 3Environment
- 4Volumes
- 5Your spec
What are you specifying?
Select everything you need. A motor, drive and gearbox can be specified together as one axis.
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 supply-network 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
Let our experienced engineers do the hard work for you
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.
- Reviewed by an engineer, not an autoresponder
- Like-for-like and better-fit alternatives
- Standard, modified and custom options
Prefer to configure it? Use the spec builder.
How it works
From enquiry to delivery
Send a part number or describe the application. Our engineers take it from there: the right product, a clear quotation, and delivery and support arranged.
- 01Tell us what you needSend a part number, or configure the application, quantities and timing.
- 02An engineer reviews itWe check the specification and find the original part, a checked equivalent or a complete axis.
- 03Receive your quotationProducts, pricing, lead time and compatibility notes in one reply.
- 04Order and deliveryWhen you are happy, the order is placed and delivery and after-sales support are arranged.