Rodless belt actuator
Rollon ELM Plus rodless belt actuator
Belt-driven compact linear unit for dirty environments in sizes 50, 65, 80 and 110, with a cleanroom ELM Plus CR version.
Key specifications
| Sizes | 50, 65, 80, 110 |
|---|---|
| Drive | Toothed belt |
Summarised in our own words from The Timken Company's published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1 · Source 2
Notes on this data
Stroke, speed and load figures are in the ELM data sheet (FlippingBook) which could not be read.
Specify Motion is not affiliated with The Timken Company. Rollon and ELM Plus are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
Alternatives that meet or exceed these figures
Engineers often come to us with a Rollon part number and leave with an alternative that is easier to source, quicker to deliver or a better fit for the machine. These 3 series from our supply network are the closest match on published figures.
Wide steel-cord urethane belt version of the B3 rodless actuator for long, fast strokes up to 14.6 m and 5 m/s with integral bearing guidance.
View B3W Belt-Drive Rodless →Belt-driven rodless actuator in six sizes for long, fast strokes, offered unguided (U), with self-cleaning solid bearings for dusty sites (S), or on profiled rail for heavy loads (P).
View series →Steel-belt driven linear module with integral guide rail, intended as a long-stroke, high-speed replacement for pneumatic cylinders.
View LB Belt-Drive Linear Actuator →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.
What a rodless belt actuator is
A rodless belt actuator moves a carriage along an aluminium profile using a toothed belt driven by a pulley at one end. The load mounts on the carriage, which runs on internal bearings or profile rails, so the unit carries and guides the load. Because the belt does not whip like a long screw, stroke can be long, typically several metres, and speeds are high. Belt drives are less stiff than screws, so they suit fast transfer more than high-force pushing.
When engineers choose a rodless belt actuator
Choose a belt actuator for long strokes, high speed and lighter thrust loads, such as transfer axes, gantries and pick-and-place over distance. The trade-offs are stiffness, thrust and accuracy: belt stretch reduces stiffness and repeatability compared with screw drives, and vertical axes need a brake and careful sizing. For high thrust or tight positioning at short stroke, a screw rodless actuator is usually a better fit.
How to specify the Rollon ELM Plus
Send these with your enquiry and an engineer can confirm the right ELM Plus variant or an equivalent:
- Payload mass and moment loads (kg, Nm)
- Stroke (mm or m)
- Speed and acceleration (m/s, m/s²)
- Positioning repeatability (mm)
- Thrust force needed (N)
- Orientation and any vertical axis requirements
- Motor mounting, gearbox and environment
Common mistakes to avoid
- Forgetting belt tension and stretch when tight repeatability is needed
- Using a belt actuator for pressing or high thrust tasks
- Ignoring reflected inertia and gearbox ratio on high-acceleration axes
- Mounting the profile unsupported over long spans
Rollon ELM Plus: frequently asked questions
What is the Rollon ELM Plus?
Belt-driven compact linear unit for dirty environments in sizes 50, 65, 80 and 110, with a cleanroom ELM Plus CR version. It is made by The Timken Company; Specify Motion can help source it or propose an equivalent.
Who makes the Rollon ELM Plus?
The Rollon ELM Plus is made by Rollon (The Timken Company) and is listed here for engineers comparing options. Specify Motion is not affiliated with The Timken Company; brand names are used only to identify the product.
Is there an alternative to the Rollon ELM Plus?
Yes. On published figures, Tolomatic B3W Belt-Drive Rodless and Tolomatic MXB Belt-Drive Rodless (MXB-U / MXB-S / MXB-P) are the closest match from our supply network. An engineer confirms the fit against your application before recommending anything.
How long can a belt-driven linear actuator be?
Belt actuators commonly reach several metres of stroke from one profile, and longer strokes are possible with joined profiles. The limits are profile stiffness, belt stretch, support spacing and the moment loads on the carriage. Long axes need regular supports along their length to avoid sag.
How accurate is a belt-driven actuator?
Repeatability on belt actuators is typically in the region of a tenth of a millimetre, depending on belt type, tension and load, which is coarser than screw drives. Accuracy is affected by belt stretch and pulley tolerances. For better accuracy, add linear encoder feedback or choose a screw drive.
Further reading: Rodless belt vs screw actuators · How to size a linear actuator · Linear actuators
Other rodless belt actuator series
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