Gas springs, also known as gas struts or gas lifts, are powerful mechanisms used in a variety of applications, from car trunks and tailgates to furniture and industrial machinery. Accurately measuring them is crucial for replacement or repair. This guide will walk you through the essential measurements and considerations, answering common questions along the way.
What are the Key Measurements of a Gas Spring?
The primary measurements needed to identify and order a replacement gas spring are:
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Extended Length: This is the total length of the gas spring when fully extended. Measure from the center of the eyelet (mounting hole) at one end to the center of the eyelet at the other end.
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Compressed Length: This is the total length of the gas spring when fully compressed. Again, measure from center of eyelet to center of eyelet.
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Stroke Length: This is the difference between the extended and compressed lengths. It represents the distance the gas spring travels. Stroke Length = Extended Length - Compressed Length
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Force (or Push): This refers to the amount of force the gas spring exerts at a specific point in its stroke. It's usually measured in Newtons (N) or pounds-force (lbf). This is often printed on the gas spring itself, but you may need a specialized tool to verify.
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Eyelet Diameter & Type: Note the diameter of the mounting eyelets at both ends and their type (e.g., clevis, ball stud, eyelet). The shape and size are critical for proper fit.
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Mounting Orientation: Observe how the gas spring is mounted – horizontally, vertically, or at an angle. This impacts the force exerted.
How to Measure Gas Spring Lengths?
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Safety First: Before taking any measurements, ensure the gas spring is safely contained. A suddenly released gas spring can be dangerous. If possible, partially discharge the gas spring before attempting any measurement.
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Use the Right Tools: A good quality measuring tape or ruler is essential. A caliper might be helpful for precise eyelet diameter measurements.
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Accurate Measurement Techniques: Place the measuring tape or ruler directly against the gas spring, ensuring you are measuring from the center of each eyelet. Take multiple readings to ensure accuracy.
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Record Measurements: Carefully record all measurements, including extended length, compressed length, and eyelet diameters. A simple sketch indicating the eyelet type and mounting orientation can be very useful.
What if I Don't Have the Original Gas Spring?
If the original gas spring is unavailable, you'll need to carefully observe the application and determine the required force and dimensions. Consider these points:
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Weight of the component: If the gas spring supports a moving part, weigh it accurately. This will help estimate the necessary force.
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Movement distance: The stroke length is determined by the distance the part needs to move.
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Mounting points: Identify the existing mounting points to ascertain the dimensions and type of eyelets.
What is the correct way to measure the force of a gas spring?
Measuring the force of a gas spring accurately often requires a specialized testing tool, typically a spring tester or dynamometer. These instruments measure the force exerted by the spring at various points in its stroke. It's rarely a DIY job unless you're comfortable with this equipment. Do not attempt to measure force without the proper tools and safety precautions.
How do I find the right replacement gas spring?
Once you've made all the necessary measurements, you can use them to find a suitable replacement. Many online retailers and suppliers specialize in gas springs and allow you to search based on these specifications.
By carefully and accurately measuring your gas spring, you greatly increase your chances of finding the right replacement and ensuring that your application functions correctly and safely. Remember to prioritize safety throughout the process.
