Torsion Spring Calculator

	Customer input field
	Explanation display field
Blank	Display after calculation

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the optimal design

Tokai Spring industries, Inc.

STEP1. Enter the required dimensions in the yellow blanks

Dimension input field
Modulus of elasticity		N/mm2
Material diameter		mm
Center diameter		mm
Free length		mm
Active coils		Coils
Arm 1		mm
Arm 2		mm
Spring constant		N･mm/rad

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

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

* Alternative material

STEP2. Enter the required twist angle in the yelow blanks

Load/stress characteristics column
	Angle input	Spring usage range		Stress value(N/mm2)
	degrad	Convert to Radians	Torque(N･mm)	σ
1st angle
2nd angle
3rd angle
4th angle
Specified torque at the first angle→			mass
Conversion spring constant when specified		N･mm/rad	D/d
Active coils of back calculation when specified		Coils	Material length

Please check the calculation result.

Static stress judgment table of selected wire diameter by material
Use	For general			For corrosion resistance
Angle point	SWP-A	SWP-B	SWOSC-V	SUS304WPB	SUS316WPA
Angle P1
Angle P2
Angle P3
Angle P4
Allowable static stress N/mm2

Design advice on calculation result.

Regarding the shape advice
Recommended guide bar diameter (when used for winding)
Material diameter and diameter
Active coils and free length
Between coils
Angle of point advice
1st angleP
2nd angleP
3rd angleP
4th angleP
Advice when specifying torque

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!

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.