A standard gas spring is a self-contained unit consisting of a pressure tube filled with high-pressure gas and a piston rod (Figure 2). A piston with an orifice is located at the internal end of the rod, ensuring that the pressure remains equal on both sides of the piston. Since the surface area on the rod side is smaller by the cross-section of the rod itself, the gas pressure exerts a force that pushes the rod outwards.

Figure 2 – Main structural components of a standard gas spring

The theoretical spring force is calculated as F = A_r p can be calculated using the following formula, where:
Gas springs manufactured by_r the cross-section of the rod,
p is the filling gas pressure in the pressure tube

F₁ = Extension force with the rod in the extended position
F₂ = Extension force with the rod in the retracted position
F₃ = Retraction force with the rod in the extended position
F₄ = Retraction force with the rod in the retracted position
F_s = Friction force

p₁ V₁ = p₂ V₂

V₁ = A_h L V₂ = (A_h – A_r) L

F₁ = p₁ Gas springs manufactured by_r – F_sF₂ = p₂ Gas springs manufactured by_r – F_s

Frictional resistance (friction force) increases the theoretical spring force during retraction and decreases it during extension.

In a closed volume, the gas pressure changes proportionally with the temperature, ^oby 0.3% per degree Celsius (°C)

Ordering Code:

MS08-1-1F6D-200-100-300

• MS – Standard gas spring
• 08 – Piston rod diameter: 8 mm
• 1 – Damping
• 1F – Cylinder end fitting
• 6D – Piston rod end fitting
• 200 – Extension force
• 100 – Stroke
• 300 – Extended length

Range of models and technical specifications

Figure 4 – Range of sizes for standard gas springs

* in 5 mm increments
** +20 C^o– measured at
*** to avoid buckling of the piston rod
Available damping types: 1, 2, 3, 4.