Overview

Haydon Kerk Pittman linear actuators convert motor-driven rotary motion into accurate, repeatable straight-line motion for automation, positioning, lifting, pushing, pulling, and controlled movement. Available in hybrid stepper, can-stack stepper, dual motion, and integrated-drive configurations, these actuators help engineers match force, stroke, speed, accuracy, duty cycle, and space requirements to the needs of each application.

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What does a linear actuator do?

A linear actuator creates controlled motion in a straight line. It is used when a machine or device needs to move, lift, position, slide, open, close, push, or pull a load with precision and repeatability.

What is a Linear Actuator?

A linear actuator is a motion device that converts rotary motion from a motor into linear motion. In many electric linear actuator designs, a stepper motor, brush DC motor, or brushless servo motor turns a lead screw, and the screw-and-nut assembly produces controlled forward or backward movement.

This controlled straight-line movement makes linear actuators ideal for precision positioning, automated adjustment, metering, dispensing, clamping, valve control, medical motion, robotics, semiconductor equipment, and industrial automation.

How Linear Actuators Work

The operation of a linear actuator is simple and effective:

• A motor generates rotational motion
• A lead screw converts rotation into linear movement
• A nut travels along the screw, producing back-and-forth motion

This straight-line motion allows actuators to perform tasks such as:

• Lifting and lowering
• Sliding and positioning
• Tilting and adjusting
• Pushing and pulling objects

When should you use a linear actuator?

Use a linear actuator when your application requires controlled straight-line motion instead of continuous rotation. Linear actuators are commonly selected when designers need accurate positioning, compact packaging, repeatable movement, lower maintenance, and simplified electrical control compared with pneumatic or hydraulic systems.

Why Use Linear Actuators?

Linear actuators are designed to meet the need for precise linear motion rather than rotary motion. They are widely used across industries due to their:

• Accuracy and repeatability
• Compact design
• Minimal Backlash (if selected)
• Efficiency and reliability
• Ability to automate motion with minimal complexity

They are an essential component in modern automation systems across manufacturing, robotics, healthcare, laboratory equipment, semiconductor systems, packaging machinery, and other applications where compact and precise motion matters.

Linear actuators come in several configurations to fit different applications.  Linear actuators are categorized by their mechanical drive mechanism, guide and housing. The most common types of linear actuators include:

Types of Linear Actuators

1. Hybrid Stepper Motor Linear Actuators

Hybrid actuators offer high performance and durability in a compact design.

• Utilize a rotor drive nut on a precision Modified ACME or high efficiency proprietary lead screw
• Deliver improved efficiency, reduced noise, and longer life
• Available in captive, non-captive, and external configurations

Ideal for applications requiring precision positioning and reliability.

2. Dual Motion Hybrid Actuators

These actuators provide independent linear and rotary motion in one compact unit.

• Combine two stepper motors for dual-axis control
• Replace complex multi-component systems
• Available in Size 14 and Size 17

Perfect for applications requiring simultaneous rotary and linear control.

3. Can-Stack Stepper Motor Linear Actuators

Can-stack actuators are designed for versatility and cost-effectiveness.

• Broader range of thrust and speed
• Robust operational parameters, including high humidity
• Larger rotor design improves efficiency
• Built with dual ball bearings for stability and long life
• Optional rare earth magnets for higher thrust

Suitable for a wide range of industrial and automation applications.

4. Hybrid Stepper with Integrated SLIM™ Step-Servo Drive

Advanced actuators with built-in programmable control systems:

• Available in Size 17 (single or double stack)
• Integrated IDEA™/SLIM™ Drive with user-friendly GUI
• Communication via USB,RS‑485, or CANOpen

Ideal for applications requiring intelligent motion control and easy integration.

Key Benefits

• High precision
• Compact size
• Low maintenance
• Reliable performance
• Easy integration

How to Choose the Right Linear Actuator

Selecting the correct linear actuator depends on matching application requirements to actuator performance. Start with the load, stroke length, speed, accuracy, duty cycle, mounting orientation, available space, control method, and environmental conditions.

Simple Selection Framework

• Define the motion: pushing, pulling, lifting, sliding, dispensing, clamping, or positioning.
• Calculate load requirements, including safety margin, friction, gravity, and acceleration.
• Confirm stroke length and usable travel distance.
• Balance speed and force, since higher force requirements often reduce achievable speed.
• Review duty cycle, temperature, dust, moisture, vibration, and expected service life.
• Select feedback or control options such as encoders, limit switches, sensors, or integrated drives when position verification is needed.

Key Questions to Consider:

• How much linear force is required?
• What is the travel distance (stroke length)?
• What is the required speed or cycle time?

Additional Factors:

• Motor size and type
• Lead screw diameter and pitch
• Gear ratio (if applicable)
• Accessories (limit switches, encoders, sensors)

Evaluation Criteria

When comparing linear actuators, consider the following:

• High repeatability
• Positioning accuracy
• Smooth and quiet operation
• Long service life
• Low maintenance requirements
• Reliability in harsh environments
• Compact design
• Safe operation
• Versatility across applications

Applications of Linear Actuators

Linear actuators are used across a wide range of industries, including:

• Manufacturing & factory automation
• Robotics & semiconductor equipment
• Medical & diagnostic devices
• Packaging & material handling
• Food & beverage processing
• Automotive & industrial vehicles
• Aerospace & marine
• HVAC systems
• Clean energy & solar tracking
• 2D/3D printing systems

These applications rely on actuators for precise positioning, automation, and improved efficiency.

Why Choose HKP Linear Actuators

Haydon Kerk Pittman linear actuators are engineered for applications that require compact design, precision motion, reliable performance, and flexible configuration. With deep expertise in lead screw technology and motion control, Haydon Kerk Pittman helps customers select or customize actuator solutions for demanding automation environments.

• Custom engineering capability for application-specific motion requirements
• Precision lead screw technology for accurate and repeatable linear motion
• Wide product range covering hybrid stepper, can-stack stepper, dual motion, and integrated-drive actuator options
• Proven reliability for automation, medical, laboratory, industrial, and motion control applications
• Support for compact designs where space, accuracy, and integration simplicity are critical
• Integration into existing designs or proven technologies.

Linear Actuator FAQs

1. What is a linear actuator and how does it work?

A linear actuator is a device that converts rotational motion from a motor into straight-line motion using a lead screw and nut mechanism. As the motor rotates, the nut moves along the screw, creating controlled push or pull motion.

2. What are the different types of linear actuators?

The most common types include hybrid stepper linear actuators, can-stack stepper actuators, dual motion actuators, and actuators with integrated drives. Each type is designed for specific performance requirements such as precision, compactness, or dual-axis motion.

3. What are linear actuators used for?

Linear actuators are used in applications that require precise linear motion, including robotics, medical equipment, factory automation, packaging systems, semiconductor equipment, and automotive systems.

4. How do I choose the right linear actuator?

To select the right actuator, consider key factors such as required force, stroke length (travel distance), speed, available space, and environmental conditions. Additional features like encoders and limit switches may also be important.

5. What is the difference between captive and non-captive linear actuators?

Captive actuators include a built-in constrained shaft that moves in and out, while non-captive actuators allow the lead screw to move freely through the motor. The choice depends on space constraints, integration potential, and application design requirements.

6. What factors affect linear actuator performance?

Performance depends on motor size, lead screw pitch, load capacity, speed requirements, duty cycle, and environmental conditions such as temperature and exposure to dust or moisture.

7. Why choose a stepper motor linear actuator?

Stepper motor linear actuators provide high positioning accuracy, repeatability, and precise control without the need for feedback systems, making them ideal for automation and motion control applications.

8. What is the difference between a linear actuator and a rotary motor?

A rotary motor produces spinning motion, while a linear actuator produces straight-line motion. A linear actuator often uses a screw mechanism to convert the motor’s rotation into controlled extension or retraction. A separate rotary motor can be used to rotate a screw or spin a nut, however, special attention must be focused on minimizing backlash common in rotary motor shafts.

9. What specifications are most important when selecting a linear actuator?

The most important specifications are force, stroke length, speed, accuracy, duty cycle, mounting orientation, motor type, lead screw pitch, control method, feedback requirements, and operating environment.

10. Are linear actuators suitable for medical and laboratory equipment?

Yes. Linear actuators are commonly used in medical and laboratory equipment because they can provide compact, precise, repeatable, and controlled motion for positioning, dispensing, sampling, imaging, and diagnostic systems.

11. Can a linear actuator be customized for a specific application?

Yes. Linear actuators can often be customized by adjusting motor size, screw lead, stroke length, nut style, mounting configuration, feedback options, wiring, and integrated control features to meet specific performance and space requirements.

12. What industries use linear actuators?

Linear actuators are used in industrial automation, robotics, medical devices, semiconductor equipment, packaging, material handling, aerospace, automotive systems, HVAC, food and beverage processing, and clean energy applications.

Summary

Linear actuators convert rotational motion into controlled linear motion, enabling precise pushing, pulling, lifting, and positioning. They are essential components in modern automation systems and are available in a wide range of configurations to meet virtually any application requirement.

✅ Looking for the right solution?  Contact HKP.

Haydon Kerk Pittman is a leading provider of precision linear motion solutions, trusted by OEMs worldwide for innovative actuator technologies and application expertise.  Our integrated lead screw actuators combine motor and linear drive elements into compact, high-performance solutions that deliver accurate positioning, repeatable motion, and long-term reliability.  With extensive customization capabilities and deep engineering support, we help customers solve complex motion challenges across medical devices, industrial automation, laboratory instrumentation, robotics, and semiconductor equipment.

Need help selecting the right actuator? Contact Haydon Kerk Pittman engineers today.