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Compression Springs Compression Springs

Enter your Outside Diameter and Free Length
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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
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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
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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

Custom Dual-Pitch Compression Springs

Definition - Custom open wound compression springs whose coils have more or less pitch in between them on one side of the spring’s body.

 

Dual pitch compression springs are also known as double-rate springs, double pitch springs, and progressive rate springs. They have a non-linear force which means it isn’t constant as it is with a regular compression spring. This custom compression spring type has a progressive rate which means that the force increases after a certain amount of travel.

It only increases because the coils with less pitch, which exert less force, are the first to compress no matter where in the spring’s body they are located. This means that the weaker coils travel first and then the stronger coils begin to travel after more force is applied.

When defining the dimensions of this spring type you have:

  • Wire Diameter
  • Outer Diameter
  • Free Length
  • Pitch 1 (defines the pitch in between the coils of one of the sides of the compression spring)
  • Pitch 2 (defines the pitch in between the rest of the coils)
  • Number of Coils in Pitch 1
  • Number of Coils in Pitch 2

Our “How to Measure Dual Pitch Springs” diagram to the right tells you just how to do this and how you must explain them at the time of getting a Instant Spring Quote.

When it comes to figuring out the total coils, you start at the second wire because that’s when it has made a full turn. Once you’ve done so, you subtract the closed coils at the ends (in these case there is two, one on each end) to calculate the number of active coils. The spaces with pitch in between them are calculated by adding 1 to the number of active coils. In this case we have FILL IN active coils so we have FILL IN spaces of pitch.

how to measure a compression dual pitchhow to measure a compression dual pitch

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Over 40 Years of Experience in Spring Engineering and Manufacturing