A linear actuator is one of those components that rarely receives attention until it fails, yet it quietly powers TV lifts, standing desks, hospital beds, agricultural vents, solar trackers, and countless industrial machines around the world. In simple terms, a linear actuator converts rotary energy from a motor into straight-line push-and-pull motion, giving designers a compact way to move loads without hydraulic pumps or pneumatic lines. Choosing the right unit, however, is far from trivial, because force, stroke, speed, duty cycle, voltage, feedback, and ingress protection all interact with one another. Zhejiang Sikete Technology Co., Ltd. has spent more than fifteen years helping engineers and distributors match electric linear actuators to real-world applications, from tiny 12V units in robotics to heavy-duty industrial linear actuators that move several tonnes. This guide explains how these devices work, what separates a good actuator from a mediocre one, and how to specify a custom linear actuator that will survive years of daily use. Whether you are an OEM designing a new product or a distributor building a catalogue, the information below will help you ask the right questions before you place an order.

At its core, a screw-driven linear actuator consists of an electric motor, a gearbox, a lead screw or ball screw, a travelling nut, and a housing that keeps everything aligned. When the motor turns, the gearbox multiplies torque while reducing speed, and the rotating screw drives the nut forward or backward along its axis. Because the nut is mechanically linked to an extension tube, that rotation becomes a smooth, controllable stroke capable of pushing or pulling a load. Most DC linear actuators use a trapezoidal lead screw for cost-effective, self-locking performance, while ball screws are selected when efficiency and higher duty cycles matter more than holding force. Limit switches at each end of travel cut power automatically so the actuator does not damage itself, and optional Hall sensors report position back to a controller. Understanding this chain of components makes diagnosis far easier later, because every symptom points to a specific part of the drivetrain. It also explains why lubrication, alignment, and correct sizing have such a large influence on service life.

A related but different technology is the linear motor, whose linear motor working principle is fundamentally electromagnetic rather than mechanical. Instead of converting rotation into translation with a screw, a linear motor produces thrust directly when current flows through a coil assembly placed inside a magnetic field. That design eliminates backlash and delivers very high acceleration, which is why linear motors dominate semiconductor handling and precision pick-and-place equipment. Screw-driven electric linear actuators remain more popular for general motion because they are cheaper, self-locking, and far more forgiving of misalignment and dust. Comparing them with a hydraulic actuator highlights another trade-off: hydraulics deliver enormous force in a small package, but they require pumps, hoses, oil, and regular maintenance, whereas electric units need only a power supply and a control switch. Pneumatic systems sit somewhere in between, offering fast, clean motion but poor position control and a constant demand for compressed air. The right choice depends on force, precision, environment, and total cost of ownership rather than on any single specification.

A micro linear actuator is typically defined by its envelope rather than its electronics, and most models measure under 50 mm in length while weighing only a few dozen grams. These small units are built for robotics, camera sliders, wearable devices, medical pumps, and consumer gadgets where space is at an absolute premium. Despite their size, modern micro actuators can produce 50 N to 500 N of force with strokes from 10 mm to 100 mm, and many support Hall-effect feedback for closed-loop positioning. Engineers working on humanoid robots and soft robotic actuators often pair several micro units to create compliant, multi-axis movement that mimics biological muscle. The main constraint is thermal, because small motors have little surface area to dissipate heat, so duty cycles must be kept short. Selecting a micro actuator therefore means balancing force density against thermal margin and mechanical mounting stiffness.

A heavy-duty linear actuator moves the opposite end of the spectrum, using reinforced housings, larger motors, and ball or roller screws to handle loads from 2,000 N to more than 20,000 N. Industrial linear actuator designs add features such as IP66 or IP67 sealing, stainless-steel hardware, grease nipples, and optional potentiometer or encoder feedback for accurate positioning. These units appear in agricultural machinery, construction equipment, mining conveyors, automated gates, and heavy material-handling systems where vibration and shock are routine. Duty cycle is the critical specification here, because a heavy load combined with frequent starts will overheat a motor long before it reaches its rated force. Many industrial buyers also require synchronous operation across multiple actuators, which demands matched speed ratings and a controller capable of current sharing. Sikete builds both compact and heavy variants on the same engineering platform, so customers can standardise on one supplier without sacrificing performance. Detailed specifications for each series are listed on the Key Products page.

Calculating force begins with the load itself, not with the actuator catalogue. You need the weight of the moving mass, the friction of any guides or hinges, the angle of the push, and a safety margin of at least 25 to 50 percent to cover shock and wear over time. A horizontal push needs far less force than a vertical lift, and an actuator mounted at an angle must be sized using the component of the load acting along its axis. Stroke length is equally important, because an actuator that reaches full extension and stalls against a mechanical stop will draw high current and generate heat quickly. Always measure the actual travel required and add a few millimetres of margin so the limit switches are never the primary stopping mechanism. Buying a unit that is oversized wastes money and space, while an undersized actuator will fail early and damage the application it was meant to serve.

Speed and load are locked together by the laws of physics, so a single actuator rated at 5 mm/s under full load may reach 30 mm/s with no load at all. If your application needs speed and force simultaneously, expect to move up a frame size or accept a shorter duty cycle. Duty cycle expresses the percentage of time an actuator can run within a given period, and typical consumer models are rated at 10 or 25 percent, while industrial versions may reach 50 percent or more. Exceeding the rating causes winding temperature to climb, which shortens brush and bearing life and eventually triggers thermal protection. Ingress protection matters just as much, because IP54 handles dust and splashes, IP65 resists water jets, and IP67 survives temporary immersion for washdown or marine environments. For outdoor installations, choose a sealed actuator with stainless hardware and a UV-resistant cable jacket, then confirm the rating with the manufacturer rather than assuming it.

Many applications simply cannot be served by a catalogue part, which is where a custom linear actuator becomes essential. Customisation can cover stroke length, rated load, speed, voltage, mounting hole pattern, cable length and connector type, colour, silencing, and even the shape of the extension tube. Zhejiang Sikete Technology Co., Ltd. supports OEM linear actuator programmes that begin with a specification review and a 3D model, move through rapid prototyping, and finish with mass production under a stable quality plan. Because the company controls its own machining, winding, assembly, and testing, changes can be implemented without relying on third-party subcontractors. Private-label packaging, custom nameplates, and bespoke control boxes are also available for distributors who want to build their own brand. If you are unsure which parameters to lock down first, the engineering team can recommend a starting configuration based on your application data.

Quality control at Sikete is built into the process rather than bolted on at the end. Every production batch passes load testing, endurance cycling, noise measurement, and insulation resistance checks, and IP-rated models are additionally validated with water and dust exposure tests. The factory maintains ISO 9001 certification, and products carry CE and RoHS compliance for European and North American markets. A dedicated R&D team works on motor winding optimisation, gearbox geometry, and sealing design, which is how the company keeps improving force density without raising prices. Export experience across dozens of countries means the logistics and documentation side is well understood, from Incoterms to customs paperwork and packaging suitable for long sea freight. Buyers who visit the facility in Zhejiang can review production lines, test benches, and inspection records in person. You can learn more about the team and capabilities on the ABOUT page.

Wiring a linear actuator is straightforward once you understand reverse polarity. A basic DC actuator has two power leads, and swapping positive and negative reverses the direction of travel, which is why simple rocker switches and DPDT relays work so well. More advanced installations use a control box with built-in limit sensing, soft start and stop, and current monitoring to protect the motor. Feedback models add Hall sensors or potentiometers so a controller always knows the exact position of the rod. Synchronising two or more actuators requires matched speed ratings and a controller that can compensate for small differences in load, otherwise the assembly will rack and jam. Always size the power supply for the actuator's peak current rather than its average draw, and keep cable runs short or use a heavier gauge to avoid voltage drop.

Modern IoT actuators integrate position feedback, current sensing, and digital communication so that machines can report their own condition to a cloud platform. That data lets maintenance teams predict wear, schedule service before a failure occurs, and optimise duty cycles automatically. Arduino and PWM control remain the most popular entry point for prototyping, since a simple H-bridge shield plus a feedback wire is enough to build a closed-loop positioner. For production systems, engineers often move to CAN bus, RS485, or industrial fieldbus interfaces that allow dozens of actuators to share one network. Soft robotic actuators take a different route altogether, using flexible chambers and electroactive materials to create gentle, compliant motion for grippers and rehabilitation devices. Whichever control architecture you choose, the actuator's feedback quality ultimately determines how precise and reliable the finished system will be.

Linear actuators appear in more places than most people realise, and the range keeps expanding as automation spreads. Home automation uses them for TV lifts, reclining furniture, window openers, and hidden storage mechanisms that must operate quietly and reliably for years. Medical and healthcare equipment relies on smooth, low-noise motion for patient beds, dental chairs, operating tables, and rehabilitation devices, where safety and hygiene are paramount. Agriculture and solar tracking benefit from rugged units that survive dust, rain, and temperature swings while positioning panels or vents with minimal maintenance. Robotics, including humanoid development and soft robotic actuators, uses compact high-precision units with feedback for delicate manipulation tasks. You can compare series on the PRODUCTS page, or browse real deployment examples on the Application Case page to see how different industries solve their motion problems.

When a linear actuator will not move, the fault usually lies in the power supply, the switch, or a blown fuse rather than in the actuator itself. If the motor hums but the rod does not extend, the most likely causes are a stripped gear, a detached coupling, or a load that exceeds the rated force. Overheating and short duty cycles point to an undersized unit, excessive friction in the mounting, or a controller that never fully de-energises the motor. Noise and vibration often come from misalignment between the actuator and its pivot points, so checking bracket geometry before replacing parts saves both time and money. Water ingress shows up as intermittent operation, corrosion on the terminals, or rust streaks around the seal, and it usually means the IP rating was insufficient for the environment. Routine maintenance is simple: keep the rod clean, lubricate the pivot pins, inspect the cable jacket, and verify that all fasteners remain tight.

Long-term reliability depends far more on correct sizing and installation than on brand alone. An actuator that operates within its duty cycle, stays aligned, and is protected from dust and moisture will often outlive the machine it was fitted to. Replacing a failed unit with a larger one is not always the answer, because extra force can overload the surrounding frame and introduce new failure points. It is better to review the original calculation, measure actual current draw, and adjust the duty cycle or gearing instead. Spare parts availability matters too, particularly for exported machinery where a single actuator failure can halt production for weeks. Sikete keeps standard models in stock and supports fast sample and production lead times so that replacement or scale-up is never the bottleneck.

Choosing a supplier is a long-term decision, and Zhejiang Sikete Technology Co., Ltd. competes on engineering depth rather than price alone. Factory-direct manufacturing in Zhejiang removes distributor markups, which means customers receive industrial-grade quality at genuinely competitive pricing. The company's 15 years of OEM and ODM experience, backed by more than 1,750 completed projects and thousands of served customers, has shaped a product range covering micro, standard, and heavy-duty requirements. Certifications such as ISO 9001, CE, and RoHS give buyers confidence when exporting to regulated markets. Engineering support extends beyond the sale, with CAD files, wiring guidance, and application advice available throughout the product lifecycle. Start at the HOME page, read company milestones on NEWS, or watch production footage on VIDEO. To discuss specifications, request samples, or obtain a quotation, reach out through the CONTACT page and an engineer will respond with a tailored recommendation.

A linear actuator is used whenever a machine needs controlled straight-line movement instead of rotation. Common examples include TV lifts, standing desks, medical beds, agricultural vents, solar trackers, automotive tailgates, and robotic joints. Any application that once relied on manual effort, hydraulics, or pneumatics can usually be upgraded with an electric linear actuator.

Start by calculating the required force, including friction and a safety margin, then confirm the stroke length and the speed you can tolerate at that load. Next, check the duty cycle and the IP rating against your environment, and decide whether position feedback is necessary. If the standard range does not fit, a custom linear actuator can be engineered to match your specification exactly.

A 12V linear actuator suits automotive, marine, and battery-powered systems, while a 24V version draws roughly half the current for the same power output. Lower current means less heat, thinner cables, and better performance in industrial installations. Both can deliver the same force and speed when the motor is wound appropriately.

Yes, Zhejiang Sikete Technology Co., Ltd. engineers custom units covering stroke, load, speed, voltage, mounting pattern, connectors, and cable length. Prototypes can be produced quickly so you can validate the design before committing to mass production. Private labelling and bespoke packaging are also available.

Sikete offers IP54, IP65, IP66, and IP67 rated models so you can match protection to the actual environment. IP65 resists water jets, while IP67 handles temporary immersion and washdown. For marine and agricultural use, choose stainless hardware and a UV-resistant cable jacket as well.

Most DC actuators reverse direction when polarity is swapped, so a dual relay module or H-bridge shield is all you need for basic control. Add a feedback wire from the Hall sensor or potentiometer to build closed-loop positioning. Always power the motor from a supply sized for peak current, not average draw.

A hydraulic actuator delivers very high force from a compact cylinder but requires pumps, hoses, oil, and regular servicing. An electric linear actuator needs only a power supply and a switch, offers precise position control, and is far cleaner and quieter. For most moderate-force applications, electric motion has a lower total cost of ownership.

IoT actuators combine integrated feedback, current sensing, and digital communication interfaces so equipment can monitor and report its own condition. This enables predictive maintenance, remote diagnostics, and automatic duty-cycle optimisation. Over time, that reduces downtime and extends the working life of the machine.

Yes, Sikete has more than fifteen years of OEM and ODM experience serving brands and distributors worldwide. Services include custom engineering, nameplates, packaging, control boxes, and dedicated quality plans. MOQ and lead times are quoted according to the complexity of the specification.

Send your application details, including load, stroke, speed, voltage, duty cycle, and environment, through the contact form on the website. An engineer will recommend a suitable standard model or outline a custom solution. Samples and production lead times are confirmed in the quotation.