Gas Springs

What Are Gas Springs?

Gas springs — also called lift supports, lift struts, or gas struts — are pneumatic devices found throughout modern vehicles and recreational equipment. Gas springs work by storing energy in the form of compressed gas inside a sealed cylinder. When the cylinder is released, that pressurized gas pushes a piston rod outward with controlled, consistent force, effortlessly raising and holding open a car hood, trunk lid, hatch, or tailgate. The same technology extends to RV compartment doors, camper beds, truck bed covers, and a wide range of other applications.

How Do Gas Springs Work?

Inside each gas spring, a compressed inert gas and dampening oil work together to create smooth, controlled motion. When you lift a hood or trunk, the strut extends; when you close it, the strut compresses and stores energy again. The key to longevity lies in the integrity of the seal where the cylinder meets the rod — keeping that rod clean and free of debris helps the gas stay inside and keeps the strut working reliably for years.

Over time, gas springs lose their charge as the internal gas slowly escapes past the piston seal. The telltale sign of a worn-out gas spring is a hood, trunk, or hatch that no longer holds itself open, requiring a prop rod or a careful hand to keep it from falling. Replacing failed struts promptly is not just a matter of convenience — a falling hood or liftgate can cause injury or damage.

Where Are Gas Springs Used?

Nearly every modern vehicle relies on gas springs in some capacity. Common automotive applications include:

• Front hood lift supports
• Trunk and rear hatch struts
• Liftgate and tailgate supports
• Rear glass window struts
• Convertible top cover lift supports

Beyond the passenger car, gas springs are widely used in RVs, camper trailers, tool boxes, truck canopy windows, and other recreational vehicle applications — making them an essential hardware component across the automotive and outdoor equipment world.

What to Look for When Shopping Gas Springs

Getting the right gas spring is critical — an incorrect unit can be too weak to hold the panel open, or so strong that it creates stress on hinges and body panels. Key factors to match include extended length, compressed length, and force rating (measured in pounds or Newtons). Most vehicle-specific replacements are engineered to exact OEM dimensions, while universal-fit struts offer adjustability for custom or non-standard applications. Always replace struts in pairs to ensure even support and consistent operation.

Top Gas Spring Brands

JR Race Car brings its roots in performance and precision to the gas spring category, offering struts well-suited to specialty and racing vehicle applications where reliable, repeatable operation under demanding conditions is essential.

Sachs is a globally recognized name in automotive damping technology with a heritage dating back to 1895. Sachs gas springs are engineered to OEM standards and trusted by major vehicle manufacturers worldwide — making them a go-to choice for factory-quality lift support replacement on a wide range of passenger cars and light trucks.