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Spring Index Formula

GoSpring Index given Shear stress in Spring Formula

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Spring Index is a measure of the coiling of a helical spring, defining the ratio of the spring's diameter to its pitch. Check FAQs

C = \frac{D}{d}

C - Spring Index?D - Mean Coil Diameter of Spring?d - Diameter of spring wire?

Spring Index Example

With values

With units

Only example

Here is how the Spring Index equation looks like with Values.

Here is how the Spring Index equation looks like with Units.

Here is how the Spring Index equation looks like.

9 = \frac{36}{4}

9 = \frac{36mm}{4mm}

9 = \frac{36}{4}

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Spring Index Solution

Follow our step by step solution on how to calculate Spring Index?

FIRST Step Consider the formula

C = \frac{D}{d}

Next Step Substitute values of Variables

∴

C = \frac{36mm}{4mm}

Next Step Convert Units

∴

C = \frac{0.036m}{0.004m}

Next Step Prepare to Evaluate

∴

C = \frac{0.036}{0.004}

LAST Step Evaluate

∴

C = 9

Spring Index Formula Elements

Variables

Spring Index

Spring Index is a measure of the coiling of a helical spring, defining the ratio of the spring's diameter to its pitch.

Symbol: C

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Spring Index

Mean Coil Diameter of Spring

Mean Coil Diameter of Spring is the average diameter of the coil in a helical spring, which is a critical parameter in spring design and functionality.

Symbol: D

Measurement: LengthUnit: mm

Note: Value should be greater than 0.

Formulas to find Mean Coil Diameter of Spring

Diameter of spring wire

Diameter of spring wire is the distance across the circular cross-section of the wire used in a helical spring, affecting its overall structure and functionality.

Symbol: d

Measurement: LengthUnit: mm

Note: Value should be greater than 0.

Formulas to find Diameter of spring wire

Other Formulas to find Spring Index

Go Spring Index given Shear stress in Spring

C = 𝜏 \cdot \frac{π \cdot d^{2}}{K \cdot 8 \cdot P}

Other formulas in Geometry of Helical Springs category

Go Mean Coil Diameter of Spring

D = \frac{D o + D i}{2}

Go Inside Diameter of Spring Coil given Mean Coil Diameter

D i = 2 \cdot D - D o

Go Outside Diameter of Spring given Mean Coil Diameter

D o = 2 \cdot D - D i

Go Diameter of Spring Wire given Spring Index

d = \frac{D}{C}

How to Evaluate Spring Index?

Spring Index evaluator uses Spring Index = Mean Coil Diameter of Spring/Diameter of spring wire to evaluate the Spring Index, Spring Index formula is defined as a measure of the ratio of the mean diameter of a helical spring to its wire diameter, providing a critical parameter in the design and analysis of helical springs, particularly in determining their stiffness, strength, and overall performance. Spring Index is denoted by C symbol.

How to evaluate Spring Index using this online evaluator? To use this online evaluator for Spring Index, enter Mean Coil Diameter of Spring (D) & Diameter of spring wire (d) and hit the calculate button.

FAQs on Spring Index

What is the formula to find Spring Index?

The formula of Spring Index is expressed as Spring Index = Mean Coil Diameter of Spring/Diameter of spring wire. Here is an example- 9 = 0.036/0.004.

How to calculate Spring Index?

With Mean Coil Diameter of Spring (D) & Diameter of spring wire (d) we can find Spring Index using the formula - Spring Index = Mean Coil Diameter of Spring/Diameter of spring wire.

What are the other ways to Calculate Spring Index?

Here are the different ways to Calculate Spring Index-

Spring Index=Shear Stress in Spring*(pi*Diameter of spring wire^2)/(Wahl Factor of Spring*8*Axial Spring Force)

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: Value
: Unit

Spring Index Formula

​GoSpring Index given Shear stress in Spring Formula

Spring Index Example

Spring Index Solution

Spring Index Formula Elements

Other Formulas to find Spring Index

Other formulas in Geometry of Helical Springs category

How to Evaluate Spring Index?

FAQs on Spring Index

Variable Name

GoSpring Index given Shear stress in Spring Formula