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Compression Springs Compression Springs

Enter your Outside Diameter and Free Length
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Outside Diameter
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Inside Diameter
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Free Length
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Wire Diameter
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Total Coils
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Rate
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Material Type
Max. Load
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Max. Deflection
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Solid Height
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*Required Field
Extension Springs Extension Springs

Enter your Outside Diameter and Length Inside Hook
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Outside Diameter
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Length Inside Hook
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Wire Diameter
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Max. Load
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Max. Deflection
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Initial Tension
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Rate
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Material Type
*Required Field
Torsion Springs Torsion Springs

Enter your Outside Diameter and Total Coils
Hint: For larger search results, enter a bigger range of Min and Max Inputs

Outside Diameter
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Inside Diameter
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Total Coils
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Free Position
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Wire Diameter
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Body Length
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Max. Torque
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Max. Deflection
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Rate
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Leg Length
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Material Type
*Required Field
Conical Springs Conical Springs

Enter you Small Outside Diameter, Large Outside Diameter and Free Length
Hint: For larger search results, enter a bigger range of Min and Max Inputs

Small Outside Diameter
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Large Outside Diameter
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Free Length
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Rate
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Total Coils
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Solid Height
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Wire Diameter
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Material Type
*Required Field

Compression Spring Measurements - How to Measure A Compression Spring

When measuring your compression spring, you must know on the following dimensions:

 

  • Outer Diameter
  • Inner Diameter
  • Free Length
  • Wire Diameter
  • Total Coils

 

Please see the graphic on the right for help.

 

You may calculate your inner diameter by subtracting two wire diameters from your outer diameter as shown in this formula:

 

OD - 2WD = ID

 

Springs are accurately measured with a dial caliper. The reason for this is because a caliper provides you with a more exact measurement. Wondering why this is so important? Well, take your spring's wire diameter as an example. In most cases, if the spring's wire diameter is off by 0.001" it'll affect your spring's rate and travel so one must have exact measurements when measuring a spring.

 

Another thing you must focus on is your end types. The end types available are the following:

 

Feel free to visit our Free Online Compression Spring Calculator

 Closed and Square The ends are closed and don't have pitch, therefore, not all the coils on your spring will be active only the coils that have pitch or space in-between the coils are active. In this case you may calculate your active coils by subtracting 2 coils from your spring's total coils: Total Coils - 2 = Active Coils.

Closed and Ground These ends are the same as closed and square ends but the ends go through a grinding process that grinds half a wire diameter off the first and last coils so that your spring will stand vertically. The calculation process for active coils is the same as the one used for closed and square ends. Total Coils - 2 = Active Coils.

Double Closed and Square ends These ends are closed but the first two coils and last two coils are touching. To figure out the active coils when it comes to this type of ends, you'll have to subtract 4 coils from your total coils: Total Coils - 4 = Active Coils.

 Open Ends These ends are the opposite of closed and square ends because the ends don't close and don't have pitch. Therefore, all the coils of a spring with open ends are active.