Gemini Gas Springs
Application sizing tool

Gas Spring Calculator

Size a compression gas spring for a rigid hinged door or flap, visualize its full travel, and carry a catalog-backed result into Gemini's configurator for engineering review.

Step 1 of 3

Define the application

Describe the door or flap from its hinge center outward. We use its orientation, weight, balance point, and handle position to model the load through the full travel.

Application orientation

Choose the closest starting layout. This sets practical angle defaults; you can fine-tune them below.

These presets use the same planar compression-spring model; their angles change how gravity acts on the door or flap.

Application dimensions
mm

Measure from the hinge center to the far edge of the door or flap.

kg

Include the door or flap, handle, hardware, glass, and anything else that moves.

mm

Measure from the hinge. For a uniform door or flap, start at half its length.

mm

Measure from the hinge to the normal hand position.

mm

Include the full door/flap thickness at the hinge, including any local reinforcement.

Choose where the hinge-pin center sits relative to the door or flap. This documents the measurement reference; it does not silently shift your X/Y values.

Travel and operating effort
Angle guide
0°90°180°270°

Select a handle, then drag around the circle.

°

0° points right; 270° points down.

°

The shortest rotation between both angles is used.

Travel swing80°Counter-clockwise

Set the manual effort used to open the door/flap and the effort required to close it from the configured open angle. Both values are forces and tune the recommended spring force without changing the mounting geometry.

N

Force at the handle while opening. Higher values allow a weaker spring; negative values indicate that closing effort is already required.

N

Force required at the handle to close from the configured open angle. A higher value selects a stronger spring; it does not change the angle.

Seal friction is not included in this preliminary estimate because it varies by spring construction. Gemini will account for it during engineering review.

The model assumes identical springs share the load evenly.

Center-to-center dimensions

Spring lengths are measured between connector pivot centers.

Temperature compensated

The nominal force estimate is normalized to 20 C / 68 F.

Engineering review required

Final selection depends on environment, duty cycle, and safety needs.