# Springs for Door Hinges

Spring Calculator Instructions

Attention! Input results shown will be +/- 10% from middle value. Hint: The closer your min and max inputs are, the more accurate your results will be!

Attention! Input results shown will be +/- 10% from middle value. Hint: The closer your min and max inputs are, the more accurate your results will be!

Attention! Input results shown will be +/- 10% from middle value. Hint: The closer your min and max inputs are, the more accurate your results will be!

#### Definition:

Commonly used torsional or compression springs mounted on the mandrel or a shaft of a door hinge to apply pressure onto the hinge’s plates when a door which is pushed open is required to close automatically after it has been released.

Springs for door hinges are a useful device as well as a safety measure in some cases. These springs can be easily found in stock at The Spring Store or can be made custom to fulfill your requirements by sending us a request for quote through our Instant Spring Quote form at Acxess Spring. The torsion springs installed into your door hinges will cause your door to execute the effect of the twin saloon doors seen in old western movies where the “bandido” bursts through the twin doors yet the doors manage to close again once he is out of reach. The effect of the doors closing automatically is achieved by the torsion spring since one of its legs is mounted against the stationary plate while the other is mounted against the plate on the door to torque when the door is opened and apply pressure back on the door once it is released to return to its original free position.

#### Design

To start designing your torsional springs for door hinges, you must calculate the weight of the door and the amount of angular movement in degrees the door will swing or travel. One also needs to calculate how many hinges the door will need to have so you know how many springs you'll need. Since the springs will be working in parallel, you will divide the required force by the amount of springs you will use so that all springs work together to provide you with just the right amount. You must also consider the diameter of the shaft or mandrel of the hinge where it will be installed so that you don’t make a spring that’s too tight to fit over it. Knowing the space you have for the installation of this spring will also be of great help to make sure it will fit accordingly to fulfill its required functions. This means that you will have to measure the length of the space of the shaft or mandrel of the door hinge where the spring will be positioned as well as the outside space you can work with. Being aware of these measurements will give you the limits you have in regards to body length and outer diameter. Body length is based on your spring’s wire diameter and total coils while outer diameter is based on inner diameter and wire diameter. The diagram provided to the right shows you how to measure your spring and will help you determine which dimensions correspond to which measurement. Know which leg will be stationary and which will torque to determine the direction of wind.

The next step is to figure out your material type. The most economical material choice is music wire. This type of wire is recommended for the indoors since it will not have to resist high temperatures, moist, or corrosive environments. The next option would be to use stainless steel for the springs for door hinges which are located outdoors. Stainless steel 302 is the most common and economical type of stainless steel wire so this would also be a great option for you. In case that you have a more complex environment where the door hinge is located, refer to our properties of common spring materials table for more material options.