Gas springs for hatches, engine rooms etc.

Gas springs, also known as gas struts or gas dampers, are a fundamental component for the assisted opening of hatches, lockers, and engine compartments on boats. A well-sized gas spring makes opening easier and safer, preventing sudden closures due to wind or rolling.

Choosing the correct gas spring requires attention to several factors. The most important is the reaction force, expressed in kg. This must be sufficient to lift the hatch, but not excessive to avoid excessive effort during closing. Equally important is the stroke length, which determines the opening angle of the hatch.

Another aspect to consider is the type of fitting. Gas springs can have threaded or ball socket fittings. Ball socket fittings are more common and offer greater mounting flexibility.

Osculati offers a selection of gas springs for nautical applications, with different lengths, reaction forces, and fitting types. Osculati gas springs are made with corrosion-resistant materials and guarantee a long service life in the marine environment.

The Advice from Nautica Basile Workshop

• Accurately measure the stroke length and the required reaction force before ordering a gas spring.


• Verify the type of fitting (threaded or ball socket) and ensure it is compatible with your hatch.


• Periodically lubricate the gas spring rod with marine grease to prolong its life.


• If the gas spring is depleted, replace it immediately to prevent sudden hatch closures.


• For particularly heavy hatches, consider using two gas springs for greater safety and ease of opening.

Remember to also check our compasses and support arms to complete your hatch opening system.

Frequently Asked Questions

How do I know which gas spring is right for my locker?

Measure the total length of the gas spring when the locker is fully open (Open mm). Then, measure the distance the spring needs to compress when the locker is closed (Stroke mm). Finally, estimate the weight of the locker and choose a spring with a Reaction kg slightly higher than this weight to ensure the locker opens fully and stays open.

Can I use a car gas spring on my boat?

Technically yes, but it is not recommended. Car gas springs are not designed to withstand the marine environment, which is highly corrosive. Using a non-marine specific gas spring means it will rust quickly, losing effectiveness and potentially seizing. Always use gas springs specifically designed for marine use.

What is the difference between a ball socket and a threaded fitting?

The ball socket fitting is more common and versatile. It consists of a metal ball at the end of the rod that attaches to a bracket or eyelet. The threaded fitting, on the other hand, has a male or female thread that screws directly onto the hatch or frame. The ball socket fitting offers greater flexibility in angle and alignment, while the threaded fitting is more rigid and requires precise alignment.

Are all gas springs the same? What should I look for when choosing?

Absolutely not. In addition to the dimensions (Open mm and Stroke mm) and the force (Reaction kg), you must consider the material (those for nautical use are in stainless steel or with specific anti-corrosion treatments) and the type of fitting. Another, less obvious factor is the build quality: cheap springs can lose gas quickly, becoming useless in a short time.

How do I know which gas spring is right for my locker?

Measure the total length of the gas spring when the locker is fully open (Open mm). Then, measure the distance the spring needs to compress when the locker is closed (Stroke mm). Finally, estimate the weight of the locker and choose a spring with a Reaction kg slightly higher than this weight to ensure the locker opens fully and stays open.

Can I use a car gas spring on my boat?

Technically yes, but it is not recommended. Car gas springs are not designed to withstand the marine environment, which is highly corrosive. Using a non-marine specific gas spring means it will rust quickly, losing effectiveness and potentially seizing. Always use gas springs specifically designed for marine use.

What is the difference between a ball socket and a threaded fitting?

The ball socket fitting is more common and versatile. It consists of a metal ball at the end of the rod that attaches to a bracket or eyelet. The threaded fitting, on the other hand, has a male or female thread that screws directly onto the hatch or frame. The ball socket fitting offers greater flexibility in angle and alignment, while the threaded fitting is more rigid and requires precise alignment.