how to measure gas springs

3 min read 31-01-2025

Gas springs, also known as gas struts or gas lifts, are crucial components in various applications, from car trunks to furniture. Accurately measuring these components is essential for proper installation, repair, and replacement. This comprehensive guide will walk you through the key measurements needed and the best methods to obtain them. Understanding these measurements ensures you select the correct gas spring for your needs, preventing malfunctions and ensuring safety.

Key Gas Spring Measurements

Before you start measuring, gather the necessary tools: a flexible tape measure, a ruler (preferably with metric and imperial markings), and possibly calipers for precise measurements. Safety first: always handle gas springs with care, as pressurized gas can cause injury.

1. Extended Length

The extended length is the total length of the gas spring when fully extended. Measure from the center of the eyelet (the mounting hole) at one end to the center of the eyelet at the other end. This measurement is crucial for determining if the spring will fit within your application's available space.

2. Compressed Length

The compressed length is the total length of the gas spring when fully compressed. Again, measure from eyelet center to eyelet center. Knowing this measurement helps ensure sufficient travel distance for your application's needs. Insufficient travel could lead to improper function.

3. Stroke Length

The stroke length is the difference between the extended and compressed lengths. This represents the gas spring's total working distance. It's a crucial specification for matching the spring to the required movement range in your application. Incorrect stroke length can render the gas spring useless.

4. Mounting Eyelet Dimensions

The mounting eyelets are the holes at each end of the gas spring used for attachment. Measure the inner and outer diameters of each eyelet. Note any special features, such as threaded eyelets. Accurate eyelet dimensions ensure proper mounting. Improper mounting can cause failure.

5. Body Diameter

Measure the diameter of the gas spring's cylindrical body. This is important for compatibility with mounting brackets and available space. Selecting a gas spring with an improper body diameter will result in fitting issues.

6. Force (Newtons or Pounds)

The force exerted by the gas spring is perhaps the most crucial measurement. This is usually stated in Newtons (N) or pounds (lbs). You can find this information on a label on the gas spring itself. However, measuring force requires specialized tools and should be done by professionals unless you are appropriately equipped. Incorrect force can lead to component damage and injury.

Measuring Gas Springs: Step-by-Step

Safety First: Ensure the area is clear of obstructions and wear appropriate safety gear. Gas springs under pressure can cause serious injury if mishandled.
Extend the Gas Spring: Fully extend the gas spring and carefully measure the extended length using your tape measure. Make sure the measurement is taken from center to center of the eyelets.
Compress the Gas Spring: Carefully compress the gas spring and measure the compressed length. Remember to measure from eyelet center to eyelet center.
Calculate the Stroke: Subtract the compressed length from the extended length to determine the stroke length.
Measure Eyelet Dimensions: Use calipers or a ruler to measure both the inner and outer diameters of each eyelet.
Measure Body Diameter: Measure the diameter of the gas spring's body.
Check the Force Rating: Locate the force rating on the spring itself, if possible. If not, you might need a professional's help to determine it.

Tools and Techniques for Precise Measurements

For the most accurate measurements, especially for eyelet dimensions and body diameter, consider using digital calipers. These provide more precise measurements than a standard ruler. A spring compressor tool can aid in safely compressing the gas spring, especially larger, stronger units.

Conclusion

Accurately measuring gas springs is vital for successful installation and functionality. By carefully following these steps and using appropriate measuring tools, you can ensure you select the correct replacement or utilize the existing gas spring effectively and safely. Remember to always prioritize safety when working with pressurized components. If unsure about any aspect of the measuring process, consult with a professional.