Help Centre

We’re here to answer all your questions around the correct application of gas struts and dampers. From key terminology, an introduction to gas struts and our series of how to videos, to selecting the right product, sizing, customisation and our range of FAQs, our Help Centre contains all of the information you’re looking for. You can also ask an expert through our adjacent contact form, with our designers and engineers on-hand to answer questions specific to your product or application.

Click here to download and complete our Gas Spring Sizing Form or here to download our Gas Spring Application Enquiry Form and submit either when completing our Ask The Expert form to help our designers and engineers with your query.

Ask The Expert

    I agree to be contacted by a member of the Camloc team using the details provided. Details will not be shared with third parties.

    • Getting Started
      Introduction to a Gas Spring Gas Strut Mounting Positions Construction of a Gas Spring Gas Spring Terminology Forces and Spring Rates Gas Spring Standards
    • Selecting The Right Product
      The Two Key Questions Standard Gas Spring Sizes Which Product is right for me? Technical Data
    • Customisation
      Tailoring your Gas Spring
    • Want to Know More?
      Dos and Don’ts Mounting Position Terminology Mounting Orientation Mounting – Other Considerations Mounting – Practical Considerations Whitepaper – Understanding the Basics Whitepaper – Gas Spring Overview Whitepaper – Gas Spring Overview (Part 2) Whitepaper – Gas Spring Mounting
    • Show Me How
      How to fit and de-gas a Vari-Lift valved gas spring (gas strut) Stop & Stay Multi-Positional Gas Springs Cam-Stay – Multi-Positional Telescopic Stay
    • Troubleshooting
      Frequently Asked Questions
    • Datasheets
      General Range Overview Camloc Motion Control ISO 9001 Certificate Gas Spring Application Enquiry Form Gas Spring Sizing Form Vari-Lift Instruction Safety Leaflet Gas Spring Disposal Advice Safety Data Sheet – Gas Springs Safety Data Sheet – Blocklifts Safety Data Sheet – Dampers

    Forces and Spring Rates

    Static Force (P1)

    A gas spring is defined by its force output in the extending direction; this is referred to as the P1 force.

    The P1 force is the static force measurement taken 5mm from full extension in the extending direction, the units of measurement are Newtons. This is the industry standard measurement for force output.

    Force output is the result of the charge pressure acting on the cross-sectional area of the rod, mathematically this is described by the equation;


    As a result, the larger the diameter of the rod, and therefore rod area, the greater the force output will be for the same charge pressure.


    Spring Rates

    The force output of a spring is greater in its compressed state than in its extended state.



    whitepaper 1.1 graph 300x238 - Forces and Spring Rates


    The reason being that a gas spring is a sealed unit and the available gas volume is reduced as it’s displaced by the volume of the rod as it’s inserted. As a consequence, the internal pressure (and therefore force output) increases the further the rod is pushed into the tube. This is in accordance with Boyle’s Law, a basic law of chemistry, which states that at a fixed temperature, the volume of gas is inversely proportional to the pressure exerted by the gas.

    The rate of climb in force as the rod is inserted is described as the force ratio, spring rate, progression rate, P2/P1 ratio or ‘k’ factor.

    Contact Us Today

    From our base in Leicester, UK, we design and manufacture quality-engineered solutions in motion control.

    At Camloc, we are more than just a manufacturer of Gas Springs and Dampers.