Spring Index Calculator

✖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.ⓘ Mean Coil Diameter of Spring [D]			+10% -10%
✖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.ⓘ Diameter of spring wire [d]			+10% -10%

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

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Spring Index Solution

STEP 0: Pre-Calculation Summary

Formula Used

Spring Index = Mean Coil Diameter of Spring/Diameter of spring wire
C = D/d
This formula uses 3 Variables

Variables Used

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.
Mean Coil Diameter of Spring - (Measured in Meter) - 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.
Diameter of spring wire - (Measured in Meter) - 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.

STEP 1: Convert Input(s) to Base Unit

Mean Coil Diameter of Spring: 36 Millimeter --> 0.036 Meter (Check conversion here)
Diameter of spring wire: 4 Millimeter --> 0.004 Meter (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

C = D/d --> 0.036/0.004

Evaluating ... ...

C = 9

STEP 3: Convert Result to Output's Unit

9 --> No Conversion Required

FINAL ANSWER

9 <-- Spring Index

(Calculation completed in 00.004 seconds)

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Home » Physics » Design of Automobile Elements » Design of Springs » Helical Springs » Mechanical » Geometry of Helical Springs » Spring Index

Credits

Created by Kethavath Srinath

Osmania University (OU), Hyderabad

Kethavath Srinath has created this Calculator and 1000+ more calculators!

Verified by Urvi Rathod

Vishwakarma Government Engineering College (VGEC), Ahmedabad

Urvi Rathod has verified this Calculator and 1900+ more calculators!

< Geometry of Helical Springs Calculators

Mean Coil Diameter of Spring

LaTeX Go Mean Coil Diameter of Spring = (Outer Diameter of Spring Coil+Inner Diameter of Spring Coil)/2

Inside Diameter of Spring Coil given Mean Coil Diameter

LaTeX Go Inner Diameter of Spring Coil = 2*Mean Coil Diameter of Spring-Outer Diameter of Spring Coil

Outside Diameter of Spring given Mean Coil Diameter

LaTeX Go Outer Diameter of Spring Coil = 2*Mean Coil Diameter of Spring-Inner Diameter of Spring Coil

Spring Index

LaTeX Go Spring Index = Mean Coil Diameter of Spring/Diameter of spring wire

Spring Index Formula

LaTeX Go

Spring Index = Mean Coil Diameter of Spring/Diameter of spring wire
C = D/d

Define a Spring?

A spring is an elastic object that stores mechanical energy. Springs are typically made of spring steel. There are many spring designs. In everyday use, the term often refers to coil springs. The rate or spring constant of a spring is the change in the force it exerts, divided by the change in deflection of the spring.

How to Calculate Spring Index?

Spring Index calculator uses Spring Index = Mean Coil Diameter of Spring/Diameter of spring wire to calculate 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 calculate Spring Index using this online calculator? To use this online calculator for Spring Index, enter Mean Coil Diameter of Spring (D) & Diameter of spring wire (d) and hit the calculate button. Here is how the Spring Index calculation can be explained with given input values -> 9 = 0.036/0.004.

FAQ

What is 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 and is represented as C = D/d or Spring Index = Mean Coil Diameter of Spring/Diameter of spring wire. 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 & 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.

How to calculate 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 is calculated using Spring Index = Mean Coil Diameter of Spring/Diameter of spring wire. To calculate Spring Index, you need Mean Coil Diameter of Spring (D) & Diameter of spring wire (d). With our tool, you need to enter the respective value for Mean Coil Diameter of Spring & Diameter of spring wire and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Spring Index?

In this formula, Spring Index uses Mean Coil Diameter of Spring & Diameter of spring wire. We can use 1 other way(s) to calculate the same, which is/are as follows -

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

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