Roller screw actuator
Tolomatic RSX Extreme Force roller screw actuator
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.
Key specifications
| Ingress protection | IP65 standard; IP67 option (standard on food-grade and oil-cooled) |
|---|---|
| Temperature | 4–54 °C |
| Force (max) | 445,000 N |
| Stroke (max) | 1,500 mm |
| Linear speed (max) | 760 mm/s |
| Screw lead | 10, 12, 12.7, 25.4 |
| Screw type | planetary roller; ball on RSX10/15 |
| Backlash | roller 0.030; ball 0.381 |
| Duty | 100% |
| Sizes | RSX10, RSX15, RSX20, RSX25, RSX33P, RSX50 |
| Lead accuracy | roller ±0.0102 mm/300 mm; ball ±0.102 mm/300 mm |
| Temp extended | -30 to 60 °C with Tolomatic consultation |
Series ranges as published; individual models vary. The full datasheet, drawings and CAD models are available on request.
Tolomatic RSX Extreme Force model codes
Published model codes in the RSX Extreme Force range, with key figures from the manufacturer's data. Search this page for your part number, or send it to us for availability, pricing and lead time.
| Model code | Max force (N) | Max stroke (mm) | Max speed (mm/s) |
|---|---|---|---|
| RSX10 | 89000 | 1500 | 760 |
| RSX15 | 133000 | 1500 | 760 |
| RSX20 | 178000 | 1270 | 760 |
| RSX25 | 222000 | 660 | 760 |
| RSX33P | 294000 | 660 | 510 |
| RSX50 | 445000 | 630 | 432 |
Options
- inline LMI, RP1, RP2 reverse-parallel
- Your Motor Here up to 290 mm frame
- HT1 high torque
- oil cooling (up to 2x work capacity)
- food-grade white epoxy / 316 parts
- press models 23P/33P
- front flange, trunnion, extended tie rods
- clevis and threaded rod ends
- 12 switch choices
Typical applications
What a roller screw actuator is
A roller screw actuator is a rod actuator driven by a planetary roller screw instead of a ball screw. Threaded rollers sit between the screw and nut, so the load is spread across many line contacts rather than a limited number of balls. This gives much higher load capacity, stiffness and shock resistance in the same envelope, and typically several times the life of a ball screw of similar size. Inverted designs place the rollers on the rod, allowing the motor rotor to drive the nut directly.
When engineers choose a roller screw actuator
Choose a roller screw actuator for high forces, long life, heavy duty cycles or shock loads, such as presses, welding guns, test rigs and hydraulic replacement. The trade-offs are cost, which is higher than an equivalent ball screw, and lower efficiency at very fine leads. For moderate loads and duty, a ball screw is usually more economical. Roller screws also tolerate higher accelerations and speeds at a given diameter, which helps compact high-force designs.
How to specify the Tolomatic RSX Extreme Force
Send these with your enquiry and an engineer can confirm the right RSX Extreme Force variant:
- Peak and continuous force (N or kN)
- Full motion profile with dwell times
- Required life (km or cycles)
- Stroke (mm) and speed (mm/s)
- Shock or impact loads
- Mounting and side-load conditions
- Lubrication method and environment
Common mistakes to avoid
- Choosing a roller screw when duty and load would let a ball screw do the job
- Neglecting lubrication interval, which strongly affects roller screw life
- Calculating life on peak force instead of the cubic mean load
- Forgetting that motor and drive must also handle the peak force
Tolomatic RSX Extreme Force: frequently asked questions
What is the Tolomatic RSX Extreme Force?
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 series figures include temperature 4 °C, temperature 54 °C, force 445,000 N, stroke 1,500 mm. It is available through our supply network, and our engineers can confirm the right variant for your application.
Who makes the Tolomatic RSX Extreme Force?
The Tolomatic RSX Extreme Force is made by Tolomatic (Tolomatic Inc.) available through our supply network. Send us your requirement for pricing, lead time, datasheets and CAD.
What model codes are in the Tolomatic RSX Extreme Force range?
The RSX Extreme Force range includes RSX10, RSX15, RSX20, RSX25, RSX33P, RSX50. The table on this page lists each published model code with its key figures. Send us the code you use, or the one you need to replace, and our engineers will confirm availability, lead time or the closest equivalent.
What is the temperature of the Tolomatic RSX Extreme Force?
The published series minimum temperature is 4 °C. Individual models and sizes in the RSX Extreme Force 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.
Why are roller screws longer lasting than ball screws?
In a planetary roller screw, the load is carried across many line contacts on the threaded rollers, while a ball screw carries load through point contacts on a limited number of balls. Lower contact stress per point gives more load capacity and a longer fatigue life for the same size, typically several times longer at the same load.
When is a ball screw a better choice than a roller screw?
A ball screw is usually better value for moderate loads, normal duty and modest life targets, and it is more widely available in standard sizes and leads. Choose a roller screw when force, shock, stiffness or life requirements push a ball screw beyond a sensible size. Calculating life with the real cycle usually shows which applies.
Further reading: Ball screw vs roller screw · Hydraulic to electric actuator · Linear actuators
Often compared with
Engineers specifying this series often compare it with:
Other roller screw actuator series
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