Everything you need to know about the 500mm Gas Strut
The Dunn and Watson 500mm gas strut (500mm refers to the full extension length of the strut) is perfect for camper trailers, caravans, boats, toolboxes and 4WD canopies. They make opening and closing doors, tailgates, boots and windows a breeze, even lifting camper trailer beds, saving you from all the heavy lifting. This is a product that’s been tried and tested on the Aussie market, so you know that you’re getting a quality strut, every time.
What’s the measurements of the 500mm Gas Strut?
This 500mm strut can take a lot of weight, anything from 100n to 700n (newton force), and comes with an 8mm shaft. The rule of thumb for their weight capacity is 10kg per 100 newton force, so in theory a 500mm x 600n gas strut should have a 60kg weight capacity. This value, however, is for an ideal setup, because as the weight gets closer to the hinge the harder it needs to work. So it really depends on where you’re installing the strut, but the above calculations give you a rough guide. In addition, the stroke length of the 500mm strut is 215mm and the compressed range is 290mm.
What materials are used in these struts?
The Dunn and Watson gas strut is made of a black powder coated body and a nitro carbonised shaft. The reason that the shaft is nitro coated and not chrome plated is because it stops the shaft collecting surface rust and makes them very difficult to chip. If either of these occur, it interferes with the seal and reduces the integrity of the struts. So if there’s a chip in the strut it will fill with gas and release a little bit of the gas every time you use it, and if there’s surface rust this will wear away the seals.
How to select the right size struts for the job
If you have never worked with gas struts before, always talk to a professional, because incorrect usage can lead to severe injuries. Having said that, let’s look at why you might need a new strut and then at how you can select the right size struts for your situation. The first reason you might need new struts is because you want to replace the old struts that don’t operate correctly anymore. The second reason is because you might have introduced new weight to an existing door (perhaps a solar panel) and now the struts can’t deal with this additional weight. The last reason that people need struts is because they don’t already have them and are fed up with all the heavy lifting.
When replacing old gas struts with new, you need to know the length of the gas strut from centre of eye to centre of eye when it’s fully extended. Also the diameter of the shaft, the cylinder and the newton force. If you don’t know the newton force, you can estimate the weight it’s lifting or use a broomstick and bathroom scales to calculate this measurement. If you have extra weight on the door, you need to know this additional weight and the measurements as just mentioned (length of gas strut and the diameter of the shaft, cylinder and original newton force).
If you are installing a strut to something that doesn’t already have one, you need to use a special formula that can be slightly daunting when you look at it. This formula is written below on this page and it’s not too difficult, but you do need some measurements first. So you need the dead weight of the window or door that will be lifted (G), half the length of the door (H), and the mounting distance of the hinge (L). When you plug these numbers into the formula, it gives you the newton force of gas struts you need. The actual length of the struts you need is 60% of the length of the door, so if the door is 800mm in length, a 600mm strut would be fine. It’s always better to have a little more newton force than you need, just in case your calculations are a little off. If you find these calculations a little stressful, don’t worry – just give us a call and we can work it all out for you and tell you what size struts you need for your purposes.
How do I install these struts?
These struts come with all the fittings: eye ends, ball studs and nuts (two per strut), and brackets if necessary. When you’re installing or removing these gas struts it’s important that they aren’t under load, so that no-one in the vicinity is injured. Once you have the right size struts for your job, it’s fairly simple to replace your old struts. If you need help installing new struts, then it’s always best to ask a professional for their assistance.
Features of the Dunn and Watson 500mm Gas Struts
As the leading manufacturer of 4WD hardware in Australia, these struts go through an exhaustive quality control process. They undergo a 20,000 cycle testing at the factory and 150 hours of shaft salt exposure testing. This means that they are reliable, tough, durable and long lasting and have been tested in the Aussie market. They are ideal for anyone who spends a lot of time in dusty, sandy or salty environments.
The Dunn and Watson gas struts have a well-oiled seal and brass guided shaft, giving them a smooth gliding action, and are manufactured with an additional backup seal in case the primary seal fails. They’re built with a dampener that prevents the struts from slamming open or closed and injuring people. They can also be custom made to the specific size and newton force you need, if our standard sizes don’t suit your needs.
- High level quality control
- Well-oiled seal
- Brass guided shaft
- Additional backup seal
- Installed with a dampener
- Custom sizes available
If you’re ready to replace your old gas struts, you might also want to check out our wide range of hinges, locks, handles, drawer slides, foam and rubber seals, fasteners and lots more.
Do the lifting for you, our quality gas struts 501mm in length from center of eye to center of eye. These gas struts are perfect for camper trailer and caravan repairs or fabrications.
Make opening and closing of doors, tailgates, boots, etc, a breeze with these quality gas struts. Also refered to as gas stays and gas rams, our struts are of the highest quality.
• Quality control from factory with 20, 000 cycle testing and 150 hours of shaft salt exposure testing
• Quality product, tried and tested in the market
• Well oiled seal and brass guided shaft
• Manufactured with additional backup seal in case primary seal fails
• Custom strut lengths and pressures available upon request.
• Struts have a dampener which prevents struts from launching door unit at user, also prevents door collapsing on user
Given that Gas Struts are commonly used on doors for camper trailers, caravans and boats you might also be interested in our range Hinges, locks & handles, drawer slides, foam & rubber seals, fasteners and much more.