Length is not enough
Two springs can share a length and still differ in force, stroke, fittings, damping or mounting geometry.
Replacement support
Replace a Gas Spring
Identify the right replacement by documenting the spring you have and the application it serves. Length, force, stroke, end fittings and mounting geometry all matter.
Start with the spring you have
A useful replacement request gives Gemini both the part details and the job the spring must do.
Begin with the existing spring if it is available, but do not rely on its length alone. Record the label, force marking, dimensions and both end connections. Then describe the lid, hatch, door or panel it moves so the replacement can be checked through its full travel.
Make the application safe before removing a spring. Support the moving load and include photographs of the mechanism, mounting points and fittings. These details help Gemini distinguish a direct replacement from a spring that needs a different configuration.
Matching length is a starting point, not confirmation that a spring is safe or suitable for the application.
Record these six details
Use the checklist before opening a replacement inquiry. Measurements are most useful when their reference points are clear.
- Part number and label
- Photograph the label and copy the manufacturer, part number and force marking exactly as shown.
- Extended and compressed length
- Measure between the same defined connection points at both ends. For eyes and balls, this is normally centre to centre.
- Stroke
- Record the spring's travel, or calculate it as the difference between the extended and compressed measurements.
- Rod and cylinder diameter
- Measure the rod and body diameters. These dimensions help separate similar-looking spring families.
- End fittings and mounts
- Name both connections and record thread sizes, hole or ball diameters, bracket offsets and pin dimensions.
- Application and environment
- Describe what moves, its approximate weight, opening angle, number of springs, cycle frequency and working environment.
Measure from defined points
Keep the reference points consistent so the dimensions can be compared with a product drawing.
Scroll horizontally to view all columns.
| Record | How to approach it | Why it matters |
|---|---|---|
| Extended length | Measure the fully extended spring using the same connection references at each end. | Do not switch from centre-to-centre to outside-edge measurements between parts. |
| Compressed length | Measure the same references when compressed, only when the mechanism can be made safe. | Support the lid, hatch or panel before removing or moving a spring. |
| Stroke | Use the change between extended and compressed length as the starting stroke value. | Check that the spring will not bottom out before the mechanism reaches its stop. |
| End connections | Record the connection type and its geometry at both ends, not just the spring body. | A different eye, ball socket or clevis can change the installed length and pivot path. |
Need a visual walkthrough? Read the guide to measuring a gas spring for replacement before you take the measurements.
Three checks before you order
A replacement should fit the mechanism, not just the space occupied by the old spring.
The application sets the force
A replacement should suit the moving load and the way it travels, not only match the old label.
The environment changes the choice
Temperature, moisture, salt, chemicals, washdown and duty cycle can affect the material and configuration.
Send a review-ready request
The more complete the starting information, the less back-and-forth is needed to identify the right spring.
Photograph the complete mechanism, the spring label, both end fittings and the mounting points.
Record the extended length, compressed length, stroke, rod and cylinder diameters using defined reference points.
Add the force marking, part number, moving load, opening angle, number of springs and operating environment.
Send the information to Gemini for a replacement review before ordering or installing the spring.
Choose your next step
Use the measurement guide for an existing spring, the calculator for a conventional hinged panel, or send Gemini the information when you are ready for a replacement review.
Replacement questions
The common decisions that affect a replacement match.
- Can Gemini identify a replacement from a part number?
- Often, yes. Send the complete part number and clear photographs of the label, spring and end fittings. If the number is incomplete or belongs to another manufacturer, Gemini may also need the measured lengths, force and application details.
- What if the force marking is missing?
- Record the dimensions, fittings and application details anyway. Include the moving weight, hinge position, opening angle and number of springs so Gemini can review the required force instead of guessing from length alone.
- Can I use the calculator for a replacement spring?
- The calculator is intended for a rigid hinged door or flap and provides a preliminary estimate. Use the measurement guide for an existing spring, then ask Gemini to confirm the spring, fittings, mounting points and operating conditions.
Need help identifying the spring?
Send Gemini the part details and application context for a replacement review.
If the label is unreadable, a fitting is unusual or the mechanism is safety-sensitive, contact Gemini before ordering. Include the measurements you have and clear photographs of the spring, fittings and mounting points.
You can also review the complete measurement guide or browse the product catalogue.
- Call us for assistance
- +1 778 475-5611
- Send us an e-mail.
- gemini@geminigassprings.com
- Working Hours
- Mon – Fri: 8am – 5pm
- Pacific Time.