Ask the Experts

All our customers receive free technical advice on every project, with dedicated engineering support from concept to delivery.

Ask the Experts

Can Camloc products be customised?

Camloc does not take a one size fits all approach, even for our standard range of gas springs we offer our customers an almost limitless array of possibilities.

We offer over 8 billion different possible combinations for our “standard” 8-18 Swift & Sure spring alone!

The customisation options we offer across the range include:

  • Rods – Can be manufactured in 5mm increments.
  • Tubes – Can be manufactured in 1mm increments.
  • Oil types – We offer 3 different ones.
  • Oil levels – Can be set in 5mm increments.
  • Forces – Can be set in 5N increments.
  • Thread sizes – We offer different thread sizes appropriate to the size of the spring.
  • Pistons – Can be altered to suit the handling characteristics of the spring.
  • Symbolising – Springs can be marked with the customers name or logo.

Springs can be further customised with dust caps and our range of end fittings and brackets.

Can't find what you're looking for?

Our friendly team are more than happy to help. Call +44 (0)116 274 3600.

Tell us about your project

Gas strut forces and spring rates

Static force (P1) and spring rates and how to calculate.

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;

FORCE = PRESSURE x AREA

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.

Related Products

Can't find what you're looking for?

Our friendly team are more than happy to help. Call +44 (0)116 274 3600.

Tell us about your project

How do I determine what size gas strut I need?

As a rule, the greater the mass to be moved and / or the greater the distance it needs to move the bigger the spring diameter needs to be.

The Two Key Questions

As gas spring designers when we look to size a gas spring for a customer there are two fundamental questions we consider:

  • How heavy is the item to lift? (i.e. what force is required)
  • How far does it need to move? (i.e. what stroke length is required)

As a rule, the greater the mass to be moved and / or the greater the distance it needs to move the bigger the spring diameter needs to be.

Of course, the actual sizing of the spring is more involved than this and several other factors need to be taken into consideration such as mounting restrictions, centre of gravity etc. for this reason we use our application enquiry form which you can download here.

Can't find what you're looking for?

Our friendly team are more than happy to help. Call +44 (0)116 274 3600.

Tell us about your project

How to measure a gas strut

See how gas struts are measured using the correct terminology.

Gas Spring Terminology

Stroke – The maximum amount of travel of the rod.

Stroke – The maximum amount of travel of the rod

Extended length – The total length of the gas spring measured from centre-to-centre of the end fits

Extended length – The total length of the gas spring measured from centre-to-centre of the end fits

Closed Length – The total closed length measured from centre-to-centre of the end fits

Closed Length– The total closed length measured from centre-to-centre of the end fits

Where no end fits have been specified then the extended and closed lengths are measured from the rod end to tube end (excluding threads) as shown.

Related Products

Can't find what you're looking for?

Our friendly team are more than happy to help. Call +44 (0)116 274 3600.

Tell us about your project

What size gas struts do Camloc offer?

Camloc have the capabilities to manufacture gas springs in a wide array of sizes.

Standard Gas Spring Sizes

Gas Spring Size

Approximate Lid Weight

6-15 Up to 10kg
8-18 10-40kg
10-23 40-150kg
14-28 150-350kg

We have the capabilities to manufacture gas springs in a wide array of sizes. Our gas springs come in a range of diameters to handle different force ranges and can be made with strokes up to 1 metre long.

Gas Spring Sizes

Range of Stroke (Rod Lengths)

Range of Tube Lengths

Force Range

Thread Type

6mm rod diameter – 15mm tube diameter 60-200mm (5mm increments) 90-235mm (1mm increments) 50-400N (11.24-89.92lbs) M5x0.8
8mm rod diameter – 18mm tube diameter 60-300mm (5mm increments) 105-335mm (1mm increments) 100-850N (22.48-191.09lbs) M6x1.0
10mm rod diameter – 23mm tube diameter 60-400mm (5mm increments) 105-440mm (1mm increments) 150-1200N (33.72-269.77lbs) M8x1.25
14mm rod diameter – 28mm tube diameter 60-500mm (5mm increments) 115-555mm (1mm increments) 200-2500N (44.96-562.02lbs) M10x1.5

Through our bespoke offering, we can discuss with you the potential of manufacturing gas springs outside of our standard range, with different dimensions and handling characteristics.

For information on sizing of our products including any information on Econoloc shrouds, 316L Stainless Steel and other variations of our standard line of gas springs please view our Products Page.

If you require assistance. please contact one of our experts on + 44 (0)116 274 3600 or alternatively you can send an enquiry through our Contact Us page.

Related Products

Can't find what you're looking for?

Our friendly team are more than happy to help. Call +44 (0)116 274 3600.

Tell us about your project

Which type of gas strut do I need?

Confused by which of our products is right for you? The following will help guide your selection, if you’re still unsure you can refer to our products page for each one, or alternatively contact one of our experts.

Swift & Sure

Our standard range of compression gas springs, these are the most popular model in the Camloc range and are available in the widest range of sizes and forces.

Vari-lift

The Vari-Lift valve is an option that can be fitted to all the standard gas springs in the Camloc range, it is a small brass valve fitted to the end of the tube that allows the force of the spring to be adjusted downwards. This adjustment can be carried out in-situ, which saves both time and effort and allows individual applications to be adjusted exactly as required. They are ideal for prototyping and initial set-up of new applications.

Stainless Steel

Our Stainless Steel range is the same as the Swift & Sure range, but as the name suggests the springs are manufactured from stainless rather than carbon steel. We use 316L grade stainless steel in the manufacture of our springs and this range is intended for use in harsh environments, such as marine, food, pharmaceutical and chemical, to name but a few.

Econoloc

The Econoloc is a compression gas spring fitted with a safety locking shroud, the shroud engages automatically when the spring is fully extended and prevents the spring from compressing. This provides protection for both operators and bystanders in the event of overload or misuse, for example on catering vehicles where you need to protect customers in the event of high winds. One Econoloc is fitted per pair of springs.

Stop & Stay

Our Stop & Stay range are fitted with an adjustable friction lock nut, as the nut is turned it increases friction on the rod and enables the spring to be set to hold the application in any position. Once the lock nut is set the operator will push or pull the application to another position and it’ll hold in this position exactly as it did in the initial one. These parts are typically used for low volume or prototyping purposes due to the requirement to set each spring individually, they are used on applications such as sunbeds, monitor arms, welding or acoustic hoods.

Stop & Stay+

The Stop & Stay+ is a development of the Stop & Stay range, they serve the same purpose but rather than using a friction locking nut they utilise a factory set, internal valve mechanism, they require no periodic setting or maintenance. Whereas the Stop & Stay is intended for low volume and prototyping the Stop & Stay+ is intended for high volume manufacturing environments. These products are used for passenger information systems, monitor arms, recliner footrests and service flaps.

Dampers

These are Camloc’s range of hydraulic damping units designed to absorb, meter and control kinetic energy. Each damper is designed specifically for the application it’s intended for and are available in a number of configurations including compression and extension damping, through dampers, gassed (emulsion) dampers and separator piston types.

Blocklift

Blocklift springs allow the application to be locked in position at any point along the stroke length, this is achieved by using a internal piston arrangement actuated by a button at the end of the rod. Blocklift springs can be rigid or spring blocking type, spring blocking allow slight movement under load whereas rigid types do not. Blocklift springs have many different uses where infinite control of the position of the application is required, for example seat height and back adjustment, steering columns and medical beds.

Cam-Stay

The Cam-Stay is a multi-positional telescopic stay, it is a low cost alternative to a gas spring and does not provide any form of lift assistance. Examples of use include medical bed and chair footrests.

Can't find what you're looking for?

Our friendly team are more than happy to help. Call +44 (0)116 274 3600.

Tell us about your project