Technical Foundation
What Is a Gas Springs and Damper?
A gas spring (gas strut) is a sealed cylinder containing pressurized nitrogen gas and a sliding piston rod that extends under internal gas pressure, providing a controlled, dampened supporting force to counterbalance the weight of a hinged lid, door, or hatch through its range of motion. Unlike a mechanical coil spring, a gas spring's force curve is relatively flat across most of its stroke, giving consistent lifting assistance rather than force that builds sharply as the spring compresses.
Force rating (measured in Newtons or pounds) must be selected against the panel's weight, the mounting geometry (distance from hinge to the strut's mounting points), and the desired hold-open or assist behavior — an undersized strut won't hold the panel open reliably, while an oversized strut can make the panel slam open or be difficult to close by hand. Damper (velocity-controlled) gas springs use an internal valve that resists motion proportionally to speed, giving a soft-close or controlled-descent action rather than free-swinging motion, distinct from a standard force-only gas spring.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Force Rating | Rated extension force in N or lbf | Must be matched to panel weight and mounting geometry — under/oversizing causes unreliable hold or slam |
| Extended Length & Stroke | Full extended length and travel distance | Determines the panel's opening angle and clearance through the full range of motion |
| End Fitting | Ball stud, eyelet, clevis mount | Must match the mounting bracket hardware on the application — not universally interchangeable |
| Function | Standard (support), lockable (hold at any position), damper (speed control) | Lockable struts hold position via a push-button valve; dampers control speed rather than just providing force |
| Material | Steel (painted/plated) vs. stainless steel | Stainless resists corrosion in outdoor, marine, or washdown-exposed applications |
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Applications
Where Gas Springs and Dampers Get Used
Gas springs are specified anywhere a hinged panel needs consistent, controlled support or damped motion rather than relying on manual holding or a mechanical coil spring.
Truck & Trailer Tool Box Lids
Gas struts holding heavy toolbox and equipment access lids open without manual bracing.
Medical & Laboratory Equipment Panels
Lockable gas springs holding equipment access panels open at any position for service access.
Marine Hatches & Storage Compartments
Stainless steel gas struts resisting saltwater corrosion on boat hatch and storage lid applications.
Industrial Machine Guarding & Access Doors
Gas springs assisting the opening and controlled closing of heavy machine guard doors and access panels.
Cabinet & Furniture Hardware
Damper gas springs providing soft-close action on cabinet doors and lids in commercial furniture.
Agricultural & Construction Equipment
Gas struts supporting engine covers, service hatches and access panels on heavy equipment.
FAQ
Gas Springs and Dampers Questions, Answered
How do I calculate the right force rating for my application?
Force sizing depends on the panel's weight, the location of its center of gravity relative to the hinge, and the specific mounting points chosen for the strut's upper and lower ends — this is a moment (torque) calculation, not simply matching strut force to panel weight directly, since mounting geometry significantly affects how much strut force is actually needed. Most gas spring suppliers provide sizing calculators or charts that account for these variables.
What's the difference between a standard gas spring and a lockable one?
A standard gas spring provides continuous supporting force throughout its stroke but doesn't hold the panel at an arbitrary intermediate position on its own — external stops or full extension are needed to fix position. A lockable gas spring includes a valve, typically actuated by a push-button or cable, that locks the piston at any position along the stroke, letting the panel be held open at any point rather than only fully open or fully closed.
Why would I need a damper gas spring instead of a standard one?
A damper gas spring includes an internal valve that resists motion proportionally to speed, so it slows the panel's closing motion smoothly rather than allowing it to swing freely under gravity or spring force — this is used for soft-close applications where a slamming lid or door would be undesirable or unsafe, distinct from a standard gas spring's job of simply providing supporting force.
Can I substitute a different brand's gas spring with the same force rating?
Force rating alone doesn't guarantee compatibility — extended length, stroke, end fitting type and mounting hole spacing all need to match the original application's geometry, and even gas springs with identical force ratings can have different force curves across their stroke. Confirm all dimensional specs, not just force, before substituting.
What material should I choose for an outdoor or marine application?
Stainless steel gas struts are strongly recommended for outdoor, marine, or washdown-exposed applications, since standard painted or zinc-plated steel struts will corrode over time in sustained wet or salt-air exposure, potentially leading to seal failure and loss of gas pressure. The cost premium for stainless is generally worthwhile anywhere corrosion resistance is a real service-life concern.
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