Rod actuator
SRB Linear Servo Actuator
Ball-screw servo electric cylinder in seven frame sizes from 32 to 150, with inline or reverse-parallel motor mounting and optional force sensing, aimed at hydraulic and pneumatic replacement.
Key specifications
| Ingress protection | IP55 or IP56 depending on model |
|---|---|
| Force (max) | 49,033 N |
| Stroke (max) | 1,000 mm |
| Linear speed (max) | 1,250 mm/s |
| Screw lead | 5, 10, 20, 25 |
| Screw type | ball (anti-rotation) |
| Repeatability | 0.02 mm |
| Duty | 100% |
| Sizes | SRB32, SRB50, SRB63, SRB80, SRB100, SRB120, SRB150 |
| Force kgf max | 5,000 |
| Motor | 100 W to 15 kW servo; stepper, AC and DC also compatible |
| Force accuracy | up to 5%; 1% with optional pressure sensor |
Series ranges as published; individual models vary. The full datasheet, drawings and CAD models are available on request.
SRB Linear Servo Actuator model codes
Published model codes in the SRB Linear Servo Actuator range. Search this page for your part number, or send it to us for availability, pricing and lead time.
| Model code |
|---|
| SRB32 |
| SRB50 |
| SRB63 |
| SRB80 |
| SRB100 |
| SRB120 |
| SRB150 |
Options
- inline or reverse-parallel 1:1/2:1
- gear reduction 1:3 to 1:15
- motor flanges Mitsubishi, Yaskawa, Panasonic, Fuji, Delta
- pressure/force sensor
- front flange, trunnion, tail, side mounts
- threaded, clevis, spherical rod ends
- guide module
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 SRB Linear Servo Actuator
Send these with your enquiry and an engineer can confirm the right SRB Linear Servo Actuator variant:
- 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
SRB Linear Servo Actuator: frequently asked questions
What is the SRB Linear Servo Actuator?
Ball-screw servo electric cylinder in seven frame sizes from 32 to 150, with inline or reverse-parallel motor mounting and optional force sensing, aimed at hydraulic and pneumatic replacement. Published series figures include force 49,033 N, stroke 1,000 mm, linear speed 1,250 mm/s, repeatability 0.02 mm. It is available through our supply network, and our engineers can confirm the right variant for your application.
Who makes the SRB Linear Servo Actuator?
The SRB Linear Servo Actuator is part of a range available through our supply network. Send us your requirement for pricing, lead time, datasheets and CAD.
What model codes are in the SRB Linear Servo Actuator range?
The SRB Linear Servo Actuator range includes SRB32, SRB50, SRB63, SRB80, SRB100, SRB120, SRB150. 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 force of the SRB Linear Servo Actuator?
The published series maximum force is 49,033 N. Individual models and sizes in the SRB Linear Servo Actuator 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.
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
Often compared with
Engineers specifying this series often compare it with:
Other rod actuator series
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