Compression Spring Calculator

	Customer input field
	Explanation display field
Blank	Display after calculation

List of spring calculators

More about Compression Springs

Click here to request
the optimal design

Tokai Spring industries, Inc.

STEP1. Enter the required dimensions in the yellow blanks

Dimension input field
Transverse elasticity modulus		N/mm2
Material diameter		mm
Center diameter		mm
Free height		mm
Number of active coils		Coils
Total number of coils		Coils
Number of end coils		Coils
Spring constant		N/mm

For general use
SWP-A SWP-B ・・・ Spring material for light load
SWOSC-V（55SiCr6-3）・・・ Spring material for high durability
SUP10 （51CrV4）・・・ Spring material for heavy load

Corrosion-resistant materials
SUS304-WPB（X5CrNi18-9）, SUS316-WPA（X5CrNiMo17-12-2）・・・ For light load
SUS304（X5CrNi18-9）, SUS316 （X5CrNiMo17-12-2）・・・ For heavy load

* Alternative material

Compression spring diagram

STEP2. Enter the required load and height values in the yelow blanks

Load & Stress Characteristic Columns
	Load value (N) Enter	Spring usage scope		Stress value (N/mm2)		Judgment on spring usage scope
	Load value (N) Enter	Height (mm)	Deflection (mm)	τ	τ0	Deflection (%)	Pass/ fail
1st load P1
2nd load P2
3rd load P3
4th load P4
Specified height at 1st load (mm)→				Solid height		Total deflection
Reverse calculation spring constant when specified			N/mm	H/D		D/d
Reverse calculation number of active coils when specified			Coils	Mass		Material length

Please check the calculation result.

Static Stress Judgment Table for Selected Wire Diameter by Material
Use	Usage scope judgment	For general use				For corrosion resistance
Use	Usage scope judgment	For light loads		For high durability	For heavy loads	For light loads		For heavy loads
Load point	Scope Pass / fail	SWP-A	SWP-B	SWOSC-V	SUP10	SUS304WPB	SUS316WPA	SUS304	SUS316
P1
P2
P3
P4
Permissible static stress N/mm2

Design advice on calculation result.

Shape advice	Aspect ratio
	Wire diameter and diameter
	Number of active coils
	End coils
	Free length and deflection
	Material length
Load point advice	1st load P
	2nd load P
	3rd load P
	4th load P
Advice for when specifying the height

This comment is for reference only.
Even if a comment to correct the entered value is displayed,
I may be able to do a special and optimal design for you.
Feel free to get in touch by pressing the ‘Contact Us’ button!

Enter a number in this field to clarify the dimensional specifications of the compression spring!

Choose one!

Enter the diameter of the material used for the spring!

Not the outer or inner diameter. This is the center Inner diameter + wire diameter = center diameter Outer diameter-wire diameter = center diameter

Length when the spring is not loaded

This number of turns functions as a spring

This shows how much repulsive force can be obtained when the spring is compressed by 1 mm.

Please enter the requested
repulsive force to the spring.

If the required compression height is not reached for each load in the above table, the "spring constant" of the input dimensions and the desired "load-height relationship" do not match. In such a case, enter the desired compression height for the first load "here", and the back constant spring constant and effective number of turns will be displayed in the lower column.

The height at which the wound portion of the spring whose dimensions have been entered is in close contact and can no longer be compressed is called the "contact height".
Note!
Not all springs can be compressed to the contact height because there is a relationship with the stress during contact!

Please check what percentage of the total deflection is the deflection under each load. Since the coil spring is basically used in the range of 20-80% of the total deflection, it is judged whether it is within that range.

We will determine if there is a material with the wire diameter you have selected. If so, we will also determine if it can withstand the desired use.
However, the judgment range is a condition that the compression count is less than 2000 times.
If this condition is exceeded or the operating temperature is high, please contact us.

It is a material that can be used under general temperature and humidity conditions. However, in order to prevent rust, rust prevention treatment is required unless oil is applied in the cylinder.

It is a material that is more resistant to corrosion than general-purpose materials. However, under special conditions such as salt water or seawater, the durability may be inferior to general-purpose materials, so be sure to consult us.

By inputting the repulsive force desired for the spring, the amount of compression at that time and how much the spring can withstand are displayed as stress values.

After calculating, please refer to the below comments!