Choosing the Right Gas Strut: Materials, Seals, and Installation Tips

Gas struts are vital in many applications, from toolboxes, doors, windows, and tailgates on utes and 4WDs and caravan windows. They provide that smooth lift and assist you in opening and closing lids and doors effortlessly. But with so many options available, how do you choose the right gas strut and accessories for your project?

This guide from Dunn & Watson will equip you with the knowledge to make informed decisions. We’ll cover gas strut sizes, materials, installation tips, and features to ensure you get the perfect fit for your needs.

Gas Strut Sizes: Understanding the Numbers

Dunn & Watson offer a range of gas struts in various sizes to cater to different applications. Here’s what the size tells you:

• The first number (e.g., 6) refers to the diameter of the gas strut shaft in millimetres.
• The second number (e.g., 15) indicates the diameter of the gas chamber in millimetres.

Common sizes include:

• 6 x 15: These are smaller struts ideal for lighter applications.
• 8 x 18: A good mid-range option for applications requiring moderate lifting force.
• 10 x 20: These larger struts are suited for heavier loads.

Top tip: Bigger isn’t always better. Choose a gas strut with the appropriate force rating to handle the weight of your lid or door comfortably without overextending it.

Material Matters: Durability and Performance

The materials used in gas struts significantly impact their durability and performance. Here’s what sets Dunn & Watson struts apart:

• Metal Ends for Larger Struts: Struts designed for higher Newtons of force (lifting capacity) have metal ends to handle heavier loads effectively.
• Unique Polyoxymethylene (POM) End Fittings: Our smaller struts feature POM end fittings with brass threads. This combination offers superior strength compared to standard plastic threads, preventing them from ripping out under load.
• Nitro-Carburized Shafts: Unlike the chrome shafts found in cheaper struts, Dunn & Watson gas struts boast nitro-carburized shafts. This special treatment provides several benefits:
  • Enhanced Scratch and Chip Resistance: The nitro-carburized surface is less prone to scratches and chips, which can compromise the seal and lead to leaks.
  • Superior Rust Protection: Regular chrome shafts are susceptible to rust. Rust on the shaft can damage the seal and shorten the lifespan of the strut. Nitro-carburized shafts offer excellent rust resistance, ensuring smooth operation and longevity.

These combined features ensure that Dunn & Watson gas struts deliver reliable performance and extended service life.

The Importance of Gas Strut Seals

The seals within a gas strut play a crucial role in its longevity and performance. These seals prevent gas and oil leakage, ensuring the strut operates smoothly and efficiently. A damaged or worn seal can lead to reduced lifting power, uneven movement, and ultimately end up with strut failure.

Why is it important to keep the strut shaft clean and rust-free?

• Seal Protection: Rust on the shaft can damage the seal, causing it to wear out prematurely. This can result in gas and oil leakage, compromising the strut’s performance.
• Smooth Operation: A clean shaft ensures the seal moves smoothly, preventing unnecessary friction and wear.

How can a damaged shaft affect the strut’s performance?

• Gas Leakage: A chip or scratch in the shaft can create a pathway for gas to escape, reducing the strut’s lifting capacity over time.
• Oil Leakage: If the seal is damaged due to a damaged shaft, oil can also leak out, further compromising the strut’s function.

Gas Strut Installation Tips

Correct installation is essential for optimal gas strut performance and longevity. Here are some key tips to keep in mind:

Why should gas struts be installed vertically?

• Oil Lubrication: Gas struts contain oil that helps lubricate the seals and ensures smooth operation. Installing the strut vertically allows the oil to settle at the bottom, providing consistent lubrication to the seal.
• Seal Protection: Installing the strut horizontally can cause the oil to pool at one end, potentially drying out the seal and leading to premature wear.

What are the consequences of installing a gas strut horizontally?

• Seal Dryout: The oil may not consistently reach the seal, causing it to dry out and become less effective.
• Increased Wear: A dry seal can experience increased friction and wear, leading to a shorter strut lifespan.

Top Tip: Always refer to the manufacturer’s instructions for specific installation guidelines, as they may vary depending on the strut model and application.

Backup Seals for Added Durability

At Dunn and Watson, we prioritise durability and reliability in our gas struts. That’s why our struts feature a backup seal. If the primary seal fails due to wear or damage, the backup seal engages, ensuring continued operation. This extra layer of protection provides peace of mind and extends the lifespan of your gas struts.

Essential Accessories: Ball Studs and Nuts

When purchasing gas struts from Dunn and Watson, you’ll receive a pair of ball studs and nuts. These accessories are crucial for securing the strut to your application. Ball studs provide a flexible connection, allowing for easy installation and adjustment.

Watch our Gas Struts explainer video on YouTube to see what each element looks like.

Why choose Dunn & Watson

When it comes to gas struts, we’ve got what you need, whatever the application.
Whatever your application, we’ve got what you need. Browse Dunn & Watson’s extensive range of gas struts and accessories online or call us on 1300 210 549 to discuss your project requirements. Our friendly team is here to help you choose the perfect gas strut for your application.