Ask an EngineerWhat It Takes to Specify an Electric Actuator for Harsh Environments
By John Fenske on April 21, 2026
Electric actuators continue to displace hydraulics across industrial automation. They’re cleaner, more precise and dramatically reduce maintenance required over time. But as engineers push them into tougher operating conditions, such as marine installations, food processing lines, mining equipment and military platforms, a gap opens between what standard catalog actuators offer and what an application demands.
Most off-the-shelf electric actuators aren’t built for corrosive chemicals, temperature swings, high shock loads or electromagnetic interference. Specifying one that will survive means thinking across several failure modes at once.
Corrosion and Ingress Are Two Different Problems
Corrosion can degrade housings, seals and fasteners. Particulate ingress accelerates wear on moving components. Moisture shorts electrical connections. Each failure mode requires its own countermeasure.
Material selection is the first line of defense. Polished 316 stainless steel resists the caustic cleaning agents found in food and beverage manufacturing, and the same material holds up in mining, packaging, agriculture and marine environments. For outdoor installations exposed to weather and wide temperature swings, protective coatings add another layer. Chemical agent resistant coating (CARC), developed for tactical military equipment, can extend an actuator’s outdoor service life to 15 to 20 years.
But material choice alone doesn’t solve ingress. Welded housing seams eliminate pathways that particulates would follow to reach internal components. Still, welding can’t seal every entry point. Seal material and geometry matter. Custom-extruded seals provide tighter fits than generic alternatives, and replaceable seal cartridges allow field maintenance without pulling the entire actuator offline. Dual seal systems address the reality that no single seal point stays reliable over a long service life.
Roller Screws Outperform Ball Screws Under Shock
In applications with repeated shock and vibration, such as resistance spot welding, pressing operations or mobile equipment, the choice between roller screw and ball screw mechanisms becomes a critical design decision.
The difference comes down to the contact area. Roller screws distribute loads across a larger surface between the screw threads and bearings. Ball screws concentrate forces on smaller contact points. Under repeated shock loading, ball screw bearings can deform and lose performance over time. Roller screws resist this kind of damage because their greater contact area disperses the load and their construction is stiff enough to avoid deformation.
Beyond screw selection, hardened thrust bearing journals and modified bearing geometry at the screw-bearing interface increase an actuator’s ability to absorb shock without degrading.
Temperature and EMI Round Out the Threat List
Extreme heat and cold affect actuators in ways that aren’t obvious at first. Cold thickens lubricating grease and reduces its effectiveness, while heat degrades grease entirely. Less intuitive is the fact that high temperatures cause adjacent materials to expand at different rates based on their thermal expansion coefficients. That mismatch can open new ingress points in a housing that was sealed at ambient temperature. Experienced actuator suppliers select construction materials with compatible expansion characteristics to prevent this.
While electromagnetic interference (EMI) is a narrower concern, it’s a serious one where it applies. Integrated servo actuators used in resistance spot welding rely on force sensors for feedback and control. Without adequate EMI shielding, the electromagnetic fields generated during welding can corrupt sensor readings and disrupt performance. Even integrated actuators without sensitive onboard electronics benefit from EMI-shielded motors.
The Specification Takeaway
Getting an actuator right for a harsh environment isn’t a single checkbox. It’s a set of intersecting decisions about materials, sealing, mechanical design, lubrication and electromagnetic protection.
Engineers who treat this step as a system-level problem, matching each environmental threat to a specific design response, will get better results than those who lean on a single spec like IP rating to cover everything.
For the full technical breakdown, read our white paper: “Engineering Actuators for Extreme Environments.”