Understanding Gas Strut Size Essentials
Choosing the right gas strut sizes involves understanding two primary dimensions: stroke length and extended/compressed lengths, alongside force rating. These factors dictate how a strut will operate, ensuring it supports the weight and moves the lid or panel smoothly and safely.
- Extended and compressed lengths define the strut's physical boundaries.
- Stroke length dictates the amount of travel.
- Force rating (Newtons) matches the required lift support.
- Application dictates the necessary strut dimensions and force.
- Correct sizing prevents damage and ensures safe operation.
The physical dimensions of a gas strut are critical. Extended length is the measurement from the center of one end fitting to the center of the other when the strut is fully extended. Compressed length is the same measurement when the strut is fully collapsed. The difference between these two is the stroke length, which is the total distance the strut rod will travel.
These dimensions are not arbitrary; they must correspond to the physical space available for the strut installation and the required range of motion for the lid, door, or panel it controls. For example, a gas strut for a 1967 C10 tailgate needs to accommodate the tailgate's full open angle within its stroke, without bottoming out or over-extending.
Selecting the appropriate size means ensuring the strut can fully open and close the intended component without obstruction. It's about fitting the strut's physical footprint into your project's design.
Matching Force to Function: Beyond Dimensions
What happens when a gas strut is too weak or too strong for its intended job?
A strut that is too weak will not effectively lift or hold the weight of the lid or door, potentially causing it to slam shut or sag. Conversely, a strut that is too strong can make the component difficult to close, damage hinges, or even break the strut itself. The force rating, measured in Newtons (N), is therefore as critical as the physical dimensions.
This force rating is determined by the weight and balance point of the object being lifted, as well as the desired opening speed and holding strength. For instance, a heavy garage door reinforcement strut requires a significantly higher force rating than a small cabinet door strut. Lesjöfors gas struts rear specifications often detail force ratings alongside dimensions to aid selection.
The correct force rating prevents strain on the mechanism and ensures safe, controlled operation.
Determining the required force often involves some calculation or consulting manufacturer charts. It's not just about lifting; it's about providing controlled resistance and support throughout the entire range of motion.
Always calculate the required force based on the weight of the lid/door and the distance from the pivot point to the strut's attachment point. A heavier object or a longer lever arm requires more force.
Common Problems & Best Practices for Strut Sizing
Incorrect gas strut sizes are a leading cause of premature failure and operational issues. You might encounter lids that won't stay open, slam shut unexpectedly, or are difficult to close. This often stems from improper force calculation or misjudging the required stroke length.
For example, using universal strut clamps might seem like a quick fix, but they don't alter the strut's inherent size or force limitations. Similarly, a strut angle bracket can affect leverage, but it cannot compensate for a fundamentally undersized or overpowered strut.
When selecting struts, consider the mounting points. The angle at which the strut is mounted significantly impacts the force required and the extension/retraction characteristics. Always refer to manufacturer guidelines for optimal mounting angles, which typically range from 0 to 90 degrees relative to the lid.
Before purchasing, sketch your installation, marking the hinge point, lid attachment point, and desired extended position. This visual aid helps confirm if the strut's extended and compressed lengths will fit without binding or obstruction.
Proper maintenance, like keeping the strut rod clean and avoiding side loading, also extends its life. However, even with perfect maintenance, a strut that is the wrong size will eventually fail or perform poorly. This mechanism is critical for longevity and user satisfaction.