SMC Linear Actuators: Reliable Solutions for Industrial Motion
SMC’s linear actuators and linear actuating cylinders are designed to provide precise, reliable, and efficient linear motion for a wide range of industrial automation applications. These pneumatic linear actuators convert compressed air energy into straight-line mechanical movement, making them ideal for pushing, pulling, lifting or positioning loads in automated systems.
In this section, you’ll find an overview of the different types of pneumatic linear actuators offered by SMC, their key applications, and practical guidance selecting the most suitable model for your needs.
What is a linear actuator and how does it work?
Linear actuators – also referred to as linear air cylinders, pneumatic piston cylinders, or linear motion actuators – are pneumatic devices designed to produce straight-line motion in reduced spaces. Their main function is to move a load or apply force on a tool by converting compressed air energy into mechanical work. This makes them ideal for automation systems where space efficiency is essential.
As pneumatic actuators, they represent the final element in the compressed air chain and are typically used in applications requiring precise movement or controlled force. These actuators are available in both single-acting and double-acting versions.
- In single-acting cylinders, compressed air moves the piston in one direction, and a built-in spring returns it to the starting position.
- Double-acting cylinders use compressed air to move the piston in both directions, allowing for higher force and greater control.
Many linear air cylinders also incorporate cushioning systems to help reduce end-of-stroke impacts. These can include elastic cushioning, pneumatic cushioning, or hydraulic cushioning using external devices. Such systems help reduce vibrations and noise while protecting both the actuator and the load from mechanical shock.
Types of pneumatic linear actuators
Round body cylinders
Round body cylinders are pneumatic piston rod actuators designed for compact and efficient performance. Their cylindrical makes them ideal for confined installation spaces. Available in single or double-acting versions, these actuators offer smooth operation, extended service life, and minimal maintenance. Many models comply with ISO 6432 standards, ensuring compatibility and global integration. Quick to install and easy to configure, round body cylinders are a reliable choice for a wide range of automation tasks where simplicity and durability are essential.
SMC offers tie rod and profile cylinders conforming to ISO 15552. The main difference lies in how position sensors are mounted. While profile cylinders have built-in slots for easy sensor installation, tie rod cylinders require a dedicated mounting kit to fix the sensor into one of the tie rods.
Small linear actuators designed for applications where installation space is restricted. They provide the same stroke and thrust as standard cylinders, but in a significantly reduced size. By minimising the size of the end caps and piston, these actuators are ideal for applications where every millimetre matters. Compact actuators are better suited to short strokes and lighter radial loads, but they remain a robust and efficient solution for precise linear motion in tight spaces.
Pin cylinders are short-stroke miniature actuators designed with a reduced overall length. Their compact design allows for direct installation into a machine or onto a panel, significantly reducing the required mounting space. Pin cylinders are ideal for applications such as clamping, ejecting, gripping or stopping, where limited space and precise motion are key.
Stainless steel cylinder
For environments where corrosion resistance and hygiene are essential – such as the food and pharmaceutical industries – SMC offers stainless steel pneumatic cylinders made from stainless steel 304. These actuators are durable, easy to clean, and resistant to harsh cleaning agents. Certain models are equipped with hygienic seals that comply with FDA and EU 1935/2004 standards, helping to prevent contamination and meet strict regulatory requirements.
Typical applications of linear actuators
Pneumatic linear actuators are used across countless industrial sectors thanks to their versatility and reliability. Common applications include:
- Clamping and positioning: Precisely holding or aligning workpieces in machining, assembly or inspection processes.
- Pushing, pulling and lifting: Moving components or materials in packaging, handling and transfer operations.
- Ejecting and stopping: Controlling part flow in conveyors, grippers or robotic systems.
Benefits of SMC’s linear cylinders
- Extensive product range: SMC offers one of the most extensive portfolios of linear actuators in the market, each designed to meet specific space, load, and environmental requirements.
- Customisation options: Extensive options for mounting, rod modifications, and environmental adaptability (e.g., spatter-resistant versions).
- Compliance with international standards: Many SMC cylinders conform to ISO 15552 and other global standards, ensuring compatibility, easy replacement and smooth integration into existing systems.
How to choose the right linear air cylinder?
There are several key factors to consider when selecting linear air cylinders for your application:
- Bore size and stroke: The bore size and stroke length determine the cylinder’s power and range of motion. These specifications should be calculated based on the required force and movement.
- Mounting options: Choose a mounting type that suits the design constraints of your system. Compact cylinders offer diverse mounting configurations to ensure flexibility.
- Load stopping impact: Assess the loads the cylinder will have to handle, including any stopping impacts. If needed, use shock absorbers to ensure smooth operation and protect workpieces.
- External forces: Consider potential external forces, such as side loads or other loads that could affect the cylinder.
- Operating speed and air flow: Evaluate the cylinder’s speed requirements and ensure the pneumatic circuit is designed to provide sufficient air flow for optimal performance.
- Environmental factors: Address conditions such as moisture, dust, and temperature extremes. Using components suited for specific environments will maximise the cylinder’s service life.
Optimising compressed air quality and following maintenance recommendations are essential steps to ensure reliable performance and longevity for your pneumatic systems.
Need help selecting the right linear actuator for your application? Contact our experts for personalised advice.
