How to Measure Gas Springs: A Comprehensive Guide
Gas springs, also known as gas struts or gas lifts, are essential components in various applications, from car trunks to furniture. Knowing how to accurately measure them is crucial for replacement and repair. This guide will walk you through the essential measurements and considerations for effectively measuring gas springs. Understanding these measurements ensures you get the correct replacement, preventing potential damage or malfunction.
What are the Key Measurements of a Gas Spring?
Several key measurements are needed to correctly identify and order a replacement gas spring. These include:
- Extended Length: This is the total length of the gas spring when fully extended. Measure from the center of the mounting eye at one end to the center of the mounting eye at the other end.
- Compressed Length: This is the total length of the gas spring when fully compressed. Again, measure from the center of one mounting eye to the center of the other.
- Stroke Length: This is the difference between the extended and compressed lengths. It represents the distance the gas spring travels. This is a crucial measurement for proper function.
- Body Diameter: This is the diameter of the gas spring's cylindrical body, excluding the mounting eyes.
- Mounting Eye Diameter and Type: Note the diameter of the mounting eyes (the metal loops at each end) and their type (e.g., ball stud, clevis pin, eyelet). This ensures compatibility with your application.
- Force (Newtons or Pounds): This is the amount of force the gas spring exerts at its full extension. This is arguably the most critical measurement, determining the spring's ability to support the load. This is usually printed on the spring itself, but might require a specialized tool to determine.
How to Accurately Measure a Gas Spring
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Safety First: Before taking any measurements, ensure the gas spring is safely contained. A suddenly released gas spring can cause injury. If uncertain, consult a professional.
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Extended Length Measurement: Fully extend the gas spring and carefully measure the distance between the centers of the mounting eyes using a ruler or caliper. Ensure the measurement is taken along the axis of the spring.
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Compressed Length Measurement: Carefully compress the gas spring completely and measure the distance between the centers of the mounting eyes as before.
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Stroke Length Calculation: Subtract the compressed length from the extended length to determine the stroke.
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Body Diameter Measurement: Measure the diameter of the gas spring's central cylinder using a caliper.
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Mounting Eye Measurement: Measure the diameter of each mounting eye with a caliper. Note the type of mounting eye for proper replacement part selection.
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Force Measurement (if necessary): This requires specialized tools that are not usually accessible to home users. If the force rating is not visible on the spring itself, it may be necessary to seek the services of a professional for precise measurement. This is usually not required for direct replacement, but is useful for custom spring design.
What if I Don't Have the Original Gas Spring?
If you're replacing a gas spring without access to the original, accurate measurements are essential. Failing to get them right can lead to improper operation or even damage. Take detailed notes and pictures of the mounting points and how the original gas spring was installed.
Where Can I Find Replacement Gas Springs?
Many online retailers and industrial suppliers specialize in gas springs. Use the measurements you've taken to find a suitable replacement. Provide all the measurements listed above for the most accurate match.
What Tools Do I Need?
You'll primarily need a sturdy ruler or a caliper for accurate measurements. For difficult-to-reach measurements, a flexible measuring tape may be useful.
This detailed guide provides a comprehensive approach to measuring gas springs. Remember that accurate measurements are critical for successful replacement. If you're unsure about any aspect of this process, it's always best to consult a professional.
