Choosing the right linear actuator is only part of a successful automation project. The actuator also needs to be mounted correctly so it can transfer force in the intended direction, move through the full stroke, and avoid binding, side loading, or premature wear. Most electric linear actuators are designed to push or pull along the centerline of the actuator rod. If the mounting geometry forces the actuator to bend, twist, or carry unsupported side loads, the rod, housing, brackets, or application frame can be damaged. This article explains the most common linear actuator mounting methods, when to use each one, how to choose mounting brackets, and what to check before final installation.
Why Linear Actuator Mounting Matters
A linear actuator creates straight-line motion, but many applications move through an arc or guided path. Doors, hatches, lids, recliners, cabinets, agricultural equipment, and industrial panels often change angle as they open or close.
The mounting method needs to match that motion. A good mount allows the actuator to move freely while keeping force aligned with the application. A poor mount can cause:
- Bent actuator rods
- Scraping between the rod and housing
- Binding during extension or retraction
- Reduced force transfer
- Noisy movement
- Loose brackets or damaged fasteners
- Premature actuator failure
- Uneven movement in multi-actuator systems
Before drilling mounting holes, confirm the actuator stroke, retracted length, extended length, bracket type, pivot path, load direction, and available clearance.
Common Linear Actuator Mounting Methods
| Mounting Method | Best For | Main Advantage | Watchouts |
|---|---|---|---|
| Dual-pivot mounting | Doors, hatches, lids, recliners, angled mechanisms | Allows the actuator to pivot as the mechanism changes angle | Pivot points must be aligned and the actuator needs clear travel |
| Stationary or fixed mounting | Straight push/pull tasks, button pressing, guided slides, bellows, fixtures | Keeps the actuator body fixed in place | Load must stay aligned with actuator centerline |
| Guided mounting with rails | Sliding panels, lift platforms, heavy loads | Rails support the load while the actuator provides motion | Rails must be aligned and not create binding |
| Custom bracket mounting | OEM, industrial, mobile, or unusual geometry | Can match unique space or load requirements | Requires careful design and load verification |
Dual-Pivot Mounting
Dual-pivot mounting is the most common method for many linear actuator applications. It uses a pivoting connection at both ends of the actuator, often with clevis or T-shaped brackets and mounting pins.
A clevis bracket is a U-shaped bracket that holds the actuator mounting point with a pin. T-shaped brackets are for actuators that have a slot in their mounting ends that allows for the middle section of the T-shaped bracket to enter and mount into place with mounting pins. This allows the actuator to rotate around the pin as it extends or retracts.
Dual-pivot mounting is useful for:
- Opening and closing hatches
- Lifting cabinet doors
- Moving trap doors
- Reclining furniture
- Adjusting panels
- Pivoting solar panels
- Marine engine hatches
- Agricultural equipment doors
For this setup, one bracket is attached to the fixed frame and the other is attached to the moving component. As the actuator extends, the moving component rotates or travels along its intended path.
Important checks:
- The actuator must not hit the frame at any point in its travel.
- The brackets must be mounted in the same plane.
- The mounting pins should slide through cleanly without forcing.
- The actuator should be able to pivot freely at both ends.
- The extended and retracted positions must match the application’s open and closed positions.
- The brackets and fasteners must be rated for the expected load.
Stationary or Fixed Mounting
Stationary mounting keeps the actuator body fixed in one position while the rod pushes or pulls a load in a straight line. This can be useful when the actuator is driving a guided object, compressing a bellows, pressing a button, pushing a fixture, or moving a mechanism that is already constrained by rails or guides.
In this layout, the actuator may be held with a shaft end bracket or a body mount type of bracket that wraps around the shaft housing, sometimes called shaft mounting brackets. The moving load should remain aligned with the actuator rod. If the load moves off-axis, the actuator can experience side loading.
Stationary mounting is useful for:
- Guided slide mechanisms
- Button or lever actuation
- Test fixtures
- Bellows compression
- Straight push/pull automation
- Small industrial fixtures
- Applications where the moving load is supported by rails
Important checks:
- The actuator rod must stay aligned with the load.
- The mounting surface must be rigid.
- The load should be supported by guides or rails if it is heavy.
- The bracket must not clamp the actuator in a way that restricts normal operation.
- The actuator should not be used as the only structural guide for a moving object.
Bracket Types and When to Use Them
Different actuator models use different bracket styles. Always confirm compatibility with the selected actuator before ordering.
| Bracket Type | Common Use | Notes |
|---|---|---|
| Clevis/T-shaped bracket | Pivoting applications | Most common for dual-pivot mounting. Allows angular movement and rotation. |
| Shaft End Bracket | Stationary or body support mounting | Useful when the actuator body needs support along the shaft. |
| End bracket | Front or rear actuator mounting | Common for simple push/pull setups. |
| Track actuator bracket | Track-style actuator installations | Use the bracket specified for the actuator model. |
| Custom bracket | OEM or unusual geometry | Requires engineering review and load verification. |
| Guide rails | Heavy or sliding loads | Rails support the load; the actuator provides motion. |
Progressive Automations offers actuator-specific mounting brackets. The safest path is to start from the selected actuator model, then choose the compatible bracket listed for that model and verify the compatibility charts.
How to Avoid Side Loading
Side loading happens when force is applied sideways to the actuator rod instead of along the actuator’s shaft centerline. This is one of the most important installation issues to avoid.
Common causes of side loading include:
- Misaligned brackets
- Unsupported heavy loads
- Twisting frames
- Guide rails that are not parallel
- Loads mounted off-center
- Actuators forced into brackets
- Mechanisms that move through an unexpected arc
- Too little clearance around the actuator
To reduce side loading:
- Use pivoting brackets when the mechanism changes angle.
- Use guide rails for sliding or lifting loads.
- Keep the actuator aligned with the direction of motion.
- Support the load with the frame, rails, hinges, or guides.
- Avoid using the actuator rod as a structural rail.
- Test motion through the full stroke before applying full load.
- Stop testing immediately if the actuator binds, twists, or scrapes.
Linear Actuator Mounting Checklist
Before powering the actuator, confirm the following:
- The actuator stroke matches the required travel.
- The actuator has enough clearance at full extension and retraction.
- Brackets are compatible with the actuator model.
- Fasteners are rated for the load and mounting material.
- Pivoting mounts can rotate freely.
- The actuator is aligned with the intended force direction.
- The moving load is supported by hinges, rails, guides, or structure.
- The actuator rod is not carrying side load.
- Wiring is routed away from pinch points.
- The actuator does not hit nearby objects.
- Limit switches or control settings are appropriate for the application.
- Environmental exposure matches the actuator and bracket material.
- The system has been tested at low load before full-load operation.
Common Mounting Mistakes
- Mounting both ends rigidly in an application that changes angle.
- Using stationary mounting when a pivoting mount is required.
- Choosing brackets after drilling holes.
- Ignoring the actuator’s retracted and extended length.
- Forgetting to account for stroke length.
- Letting the actuator rod scrape the housing.
- Allowing the load to twist or rack.
- Using undersized fasteners.
- Installing brackets on weak material.
- Exposing unprotected hardware to water, dust, or corrosion.
- Running the actuator before checking the full travel path.
In Summary
The best way to mount a linear actuator depends on how the load moves. Dual-pivot mounting is usually the best choice for doors, hatches, lids, and angled mechanisms because it lets both ends of the actuator rotate as the application moves. Stationary mounting is better for straight push/pull applications where the load is already guided and aligned.
The key rule is simple: the actuator should push or pull along the shaft's centerline, while the structure, hinges, rails, or guides support the load. If you are unsure which bracket or mounting method fits your application, review the compatible Progressive Automations mounting brackets for your actuator model or contact our engineering team before final installation.
Frequently Asked Questions
What is the most common way to mount a linear actuator?
Dual-pivot mounting is one of the most common methods. It uses pivoting brackets at both ends of the actuator so the actuator can rotate as the mechanism changes angle.
Can a linear actuator be mounted vertically?
Yes, many linear actuators can be mounted vertically if the load, stroke, force, bracket compatibility, and environmental conditions are appropriate. Always confirm mounting orientation and load requirements for the specific actuator model.
What is a clevis bracket?
A clevis bracket is a U-shaped mounting bracket that uses a pin to connect the actuator to a frame or moving component. It allows the actuator to pivot around the pin.
Why does a linear actuator need to pivot?
A linear actuator needs to pivot when the application moves through an arc, such as a hatch or door. Pivoting prevents the actuator from binding as the angle changes.
What is side loading on a linear actuator?
Side loading is force applied sideways to the actuator rod. Linear actuators are designed mainly for axial push/pull force, so side loading can bend the rod, damage the housing, or cause premature wear.
Do linear actuators need guide rails?
Guide rails are recommended when the actuator moves a heavy, wide, or sliding load. Rails support and guide the load while the actuator provides motion.
How do I choose the right actuator mounting bracket?
Start with the actuator model and check the compatible bracket options. Then choose the bracket style based on the motion path, load direction, available space, and whether the actuator needs to pivot.