Actuator Force Required
Force with Safety Factor of 1.5
Force with Safety Factor of 2
Center of Mass
(Ideal point to attach the end of Actuator)

We've created our own custom tool to help you calculate and select right Linear Actuator force.  Whilst this particular Calculator is based on lifting a Hatch of some form.  The same calculation can be used for many other applications including: Boat Hatch, Truck Tonneau Cover lift. Ceiling access Panel and many more. Simply Answer the questions on the left and let the Calculator give you the force required.

hatch calcuation diagram jpgLinear Actuator Calculator

There are a few exception's to this calculator however.  This assumes your Actuator will be positioned in a very similar position to the Hinge point as shown in the picture above. Also note in this picture we show the Linear Actuator pointing Downwards. Pointing the actuator down if better for water protection because it allows water to run down the shaft and not work its way into the Actuator over time by running into the Actuator Body. This method should be adopted as a rule of thumb but not Mandatory. 


You do have an option to reduce the force required by a Linear Actuator by installing Gas springs in addition to a Linear Actuator. Gas springs are considerable cheaper and are a low cost way to reduce the force required to open a Hatch. This method is especially useful for very heavy Hatches.

The second benefit of adding a gas spring is that it allows you to use a faster Linear Actuator, so that the hatch opens and closes faster. Remember Linear Actuator force and speed trade-off against each other. This means an Actuator with a high forces will go slower than an Actuator with Low force. 

The ACTUATOR FORCE CALCULATOR™ TOOL is proprietary to and © copyright 2019 of Firgelli Automations



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  • Steven J Kaiser

    I need to lift a 300 lb hatch that is 52" long. The Hinge Point is 51" away from where I am lifting.
    I’m interested in FA-400-12-X-P.
    I will be lifting the hatch with a cable attached to the base plate, traveling to the top of the FA-400-12-X-P, that will have a pulley attached (clevis pin) and then down and attached to the hatch.


    I’m looking at setting up two 12 volt actuators to lift a dual cab on a light rigid truck. The approximate weight of the cab is 350-400 pounds unladen and it is fully hinged, it is a cab -over and not a bonneted truck. The length is 70 inches and the width is 75 inches. The cabs degree of lift would not exceed 35-45 degrees nominal and will be supported by fail safe props x 3 affectively limiting the strain on actuator(s) and locking it in place for serviceperson use. This is a private vehicle and not a commercial appliance. Thankyou

  • Garnet Trist

    Very nice page , good information . I’m sure I will be back when I start my next project .

  • howard Hedley

    very informative web site , may have solved most of problem ( pop top caravan van ) with ineffective gas struts, not many give out the secret information enabling you to solve your problem and so buy .

    so far fa-400-l12-18 looking good

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