Integrated-motor actuator
Exlar GSX Series integrated-motor actuator
Earlier-generation integrated brushless servo and inverted roller screw actuator in five imperial frame sizes, now grouped by Curtiss-Wright under engineered products and reaching around 51 kN continuous.
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What are you specifying?
Select everything you need. A motor, drive and gearbox can be specified together as one axis.
Key specifications
| Continuous force | 51,278 N |
|---|---|
| Stroke (max) | 457 mm |
| Linear speed (max) | 1,016 mm/s |
| Screw lead | 2.54, 5.08, 6.35, 10.16, 12.7, 19.05, 25.4 (by frame) |
| Screw type | inverted planetary roller screw |
| Supply | 115/230/400/460 Vrms bus (GSX20, GSX30); 230/400/460 Vrms (GSX40-60); 24/48/120 Vdc options in Class 1 Div 2 ordering code |
| Sizes | GSX20 (50.8 mm / 2 in): up to 2.6 kN cont; strokes 3, 6, 10, 12 in; 845.8 mm/s; leads 2.54, 5.08, 10.16 mm, GSX30 (76.2 mm / 3 in): up to 5.7 kN cont; strokes 3-18 in; 635 mm/s; leads 2.54, 5.08, 12.7 mm, GSX40 (101.6 mm / 4 in): up to 15.4 kN cont; strokes 4-18 in; 953 mm/s; leads 2.54, 5.08, 12.7, 19.05 mm, GSX50 (139.7 mm / 5.5 in): up to 31.8 kN cont; strokes 6, 10, 14 in; 1,016 mm/s; leads 2.54, 5.08, 12.7, 25.4 mm, GSX60 (177.8 mm / 7 in): up to 51.3 kN cont; strokes 6, 10 in; 1,016 mm/s; leads 6.35, 12.7, 25.4 mm |
Summarised in our own words from Curtiss-Wright Actuation Group's published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1 · Source 2
Notes on this data
Strokes published in inches; max stroke 18 in x 25.4 = 457.2 mm (converted). Forces and speeds printed in metric by manufacturer. Listed under 'Engineered Products' on the integrated-motor page, not on the legacy list; has a 2026 catalog (2026 GSX Product Catalog.9-26.pdf, not separately read). Peak force, IP rating, backlash and operating temperature not stated on page (bellows option rated -40 to 121 C).
Specify Motion is not affiliated with Curtiss-Wright Actuation Group. Exlar and GSX Series are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Exlar GSX Series replacement and alternative options
Use these supply-network options as a starting point for an engineering check. We can also help source the original Exlar 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 | GSX Series | RSA-HT (high thrust) |
|---|---|---|
| Force | 51,278 N | 58,000 N meets or exceeds |
| Stroke | 457 mm | 1,524 mm meets or exceeds |
| Speed | 1,016 mm/s | 3,124 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 | GSX Series | BLM Built-in Linear Module |
|---|---|---|
| Force | 51,278 N | — |
| Stroke | 457 mm | 1,250 mm meets or exceeds |
| Speed | 1,016 mm/s | 1,600 mm/s meets or exceeds |
Steel-belt driven linear module with integral guide rail, intended as a long-stroke, high-speed replacement for pneumatic cylinders.
| Published maximum | GSX Series | LB Belt-Drive Linear Actuator |
|---|---|---|
| Force | 51,278 N | — |
| Stroke | 457 mm | 3,050 mm meets or exceeds |
| Speed | 1,016 mm/s | 2,000 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 an integrated-motor actuator is
An integrated-motor actuator combines the servo motor and the screw in one body, often with the motor rotor driving the screw or nut directly instead of through a coupling or belt. Many use an inverted roller screw inside a hollow rotor for a very compact, stiff design. Some versions also integrate the servo drive and position controller, so the actuator needs only power and a command or fieldbus connection. The result is a shorter, sealed unit with fewer parts to align.
When engineers choose an integrated-motor actuator
Choose an integrated-motor actuator when space is tight, a clean sealed package is wanted, or decentralised control reduces cabinet size and cabling. It suits welding guns, robot cells and hygienic plant. The trade-offs are flexibility and service: the motor cannot be changed independently, thermal limits are shared and repairs may mean replacing the whole unit. A separate motor and actuator lets you change motor size or brand later and is often easier to source as spare parts.
How to specify the Exlar GSX Series
Send these with your enquiry and an engineer can confirm the right GSX Series variant or an equivalent:
- Force, peak and continuous (N)
- Stroke (mm) and speed (mm/s)
- Supply voltage: mains AC or low-voltage DC (V)
- Control interface: analogue, pulse, Modbus or industrial Ethernet
- Feedback and absolute position needs
- Duty cycle and ambient temperature (°C)
- Sealing and cleaning requirements (IP code)
Common mistakes to avoid
- Overlooking heat build-up when motor and screw share one housing
- Assuming any drive will run it, when integrated units may need a matched drive
- Not checking cable routing and connector orientation on the machine
- Forgetting spare strategy when the whole unit is one part
Exlar GSX Series: frequently asked questions
Can you help replace Exlar GSX Series 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 Exlar GSX Series?
Earlier-generation integrated brushless servo and inverted roller screw actuator in five imperial frame sizes, now grouped by Curtiss-Wright under engineered products and reaching around 51 kN continuous. Published series figures include continuous force 51,278 N, stroke 457 mm, linear speed 1,016 mm/s. It is made by Curtiss-Wright Actuation Group; Specify Motion can help source it or propose an equivalent.
Who makes the Exlar GSX Series?
The Exlar GSX Series is made by Exlar (Curtiss-Wright Actuation Group) and is listed here for engineers comparing options. Specify Motion is not affiliated with Curtiss-Wright Actuation Group; brand names are used only to identify the product.
What is the continuous force of the Exlar GSX Series?
The published series maximum continuous force is 51,278 N. Individual models and sizes in the GSX Series 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 Exlar GSX Series?
We can assess suitable replacement options. On published figures, Tolomatic RSA-HT (high thrust) and Motion Control Products BLM Built-in Linear Module are options to assess from our supply network. An engineer confirms the fit against your application before recommending anything.
What are the advantages of an integrated motor actuator?
Combining motor and screw removes couplings, belts and the alignment that goes with them, so the actuator is shorter, stiffer and easier to seal. Versions with built-in drives also reduce cabinet space and cable runs. The downside is less flexibility for changing motor size and a larger, more expensive spare part.
Can an integrated actuator be controlled from a PLC?
Yes. Versions with built-in drives typically accept analogue, pulse and direction, discrete I/O or industrial Ethernet commands from a PLC. Versions without a drive need a compatible servo drive, often from a matched range. State the controller and network protocol at the outset so the right variant is selected.
Further reading: How to select a linear actuator · Ball screw vs roller screw · Linear actuators
Other integrated-motor actuator series
Engineer support
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