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Attention! Input results shown will be +/- 10% from middle value. Hint: The closer your min and max inputs are, the more accurate your results will be!

Outer Diameter:

to

inches mm

Inner Diameter:

to

inches mm

Free Length:

to

inches mm

Wire Diameter:

to

inches mm

Total Coils:

to

Rate: ? Spring rate or spring constant: The amout of force required to move the spring 1 inch of distance or in millimeters the amount of force required to move the spring 1 millimeter of distance.

to

lbs/in N/mm

Info! Please fill in one or more fields to narrow down your search.

Max. Load: ? The maximum amount of force or load you can place on this spring. If you put more force than this you will distort or fatigue the spring.

to

lbs N

Max. Deflection (Max. Travel):

to

inches mm

Solid Height:

to

inches mm

* Required Field

Attention! Input results shown will be +/- 10% from middle value. Hint: The closer your min and max inputs are, the more accurate your results will be!

Outer Diameter:

to

inches mm

Length Inside Hook:

to

inches mm

Wire Diameter:

to

inches mm

Info! Please fill in one or more fields to narrow down your search.

Max. Load: ? The maximum amount of force or load you can place on this spring. If you put more force than this you will distort or fatigue the spring.

to

lbs N

Max. Deflection (Max. Travel):

to

inches mm

Initial Tension: ? The force required to seperate the coils of an extension spring before the spring will extend.

to

lbs N

Rate: ? Spring rate or spring constant: The amout of force required to move the spring 1 inch of distance or in millimeters the amount of force required to move the spring 1 millimeter of distance.

to

lbs/in N/mm

* Required Field

Attention! Input results shown will be +/- 10% from middle value. Hint: The closer your min and max inputs are, the more accurate your results will be!

Outer Diameter:

to

inches mm

Inner Diameter:

to

inches mm

Free Position or Leg Position in degrees: ? Free Position or Leg Position in degrees

degrees

Total Coils:

to

Wire Diameter:

to

inches mm

Body Length:

to

inches mm

Info! Please fill in one or more fields to narrow down your search.

Max. Torque: ? The amount of force applied to a torsion spring to radially move the springs leg a certain amount of degrees.

to

lbs N

Max. Deflection (Degrees of travel):

to

degrees

Rate: ? Torsion spring rate is the amount of radial force required to move the spring 360 degrees of distance. Divide the spring rate by 360 degrees to get the rate per degree

to

in-lbs./deg. N-mm/deg.

Leg Length: ? Both legs are equal in length

to

inches mm

* Required Field

Attention! Input results shown will be +/- 10% from middle value. Hint: The closer your min and max inputs are, the more accurate your results will be!

Small Outer Diameter:

to

inches mm

Large Outer Diameter:

to

inches mm

Free Length:

to

inches mm

Info! Please fill in one or more fields to narrow down your search.

Rate: ? Spring rate or spring constant: The amout of force required to move the spring 1 inch of distance or in millimeters the amount of force required to move the spring 1 millimeter of distance.

to

lbs/in N/mm

Total Coils:

to

Solid Height:

to

inches mm

Wire Diameter:

to

inches mm

Spring Constant Units Calculator

In today's fast-paced engineering landscape, precision and efficiency are paramount. The spring constant, a fundamental aspect of spring design, plays a pivotal role in your compression, extension, and torsion spring projects. This article is your gateway to mastering the art of spring constant units, which are measured in pounds of force per inch (lbf/in) or newtons per millimeter (N/mm) for compression and extension springs. For torsion springs, it's inch-pounds of torque per 360º (degrees) or inch-pounds of torque per degree in the imperial system, and newtons per millimeter per 360º (degrees) or newtons per millimeter per degree in the metric system.

compression spring constant explanation

Compression And Extension Spring Rate

The spring constant is the linchpin of your compression and extension spring design, offering a linear force that you can fine-tune to meet your exact needs. Whether you're working with pounds of force (lbf) or newtons (N), the spring constant for load, or inches (in) and millimeters (mm) for travel, Spring Creator 5.0 provides the tools you need. Our formulas and diagrams will simplify the process, enabling you to calculate your compression or extension spring’s constant with precision and ease.

Constant Formula A.)

To calculate how much spring constant you need.

  • X = distance traveled
  • F = load
  • k = rate
Use the formula k = F ÷ X to calculate the spring constant you require for your specific project. With Spring Creator 5.0, this task becomes a breeze.

Rate Formula B.)

To calculate spring constant of a spring.

  • d = Wire Diameter
  • D outer = Outer Diameter
  • D = Mean Diameter
  • E = Young’s Modulus of Material
  • G = Shear Modulus of Material
  • L free = Free Length
  • k = Spring Rate (Spring Constant)
  • na = Active Coils
  • v = Poison’s Ratio of Material
D = D outer – d
G = E ÷ 2 ( 1 + V )
k = Gd^4 ÷ (8D^3 * na)
Incorporate these variables into the formula k = Gd^4 ÷ (8D^3 * na) to determine the spring rate or constant for your specific spring design. Our innovative Spring Creator 5.0 model feature simplifies the process, making it accessible and efficient for all your spring projects.

compression and extension spring constant units diagram

Unlocking the Secrets of Torsion Spring Constants

When it comes to torsion springs, understanding the spring constant is crucial for harnessing the radial force they provide. The torsion spring rate signifies the constant force or torque exerted per every 360 degrees of deflection or even per a single degree of deflection.

Torque Formula A: Calculating Torsion Spring Rate per 360º (Degrees)

  • d = wire size (inches)
  • D = Mean Diameter (inches)
  • N = Number of active coils
  • E = Modulus of Elasticity
  • R = Rate per 360º
  • R2 = Rate per Degree
R = Ed^4 / 10.8 DN R2 = R ÷ 360 Utilize the formula R = Ed^4 / (10.8DN) to determine the torsion spring rate per 360º (degrees). This is essential for a precise and functional torsion spring design.

torsion spring constant units diagram

Torque Formula B: Computing Torsion Spring Rate per Degree

  • k2 = Rate per Degree
  • X = Distance Traveled
  • F = Torque or Load
k = F ÷ X
For calculating the torsion spring rate per degree, use the formula k = F ÷ X. This enables you to determine the spring's constant on a degree-by-degree basis, ensuring precise performance in your torsion spring applications.

Explore the World of Spring Constant Units with Spring Creator 5.0

Welcome to the future of spring design. Spring Creator 5.0 brings precision and ease to your engineering projects, helping you harness the power of spring constants like never before. Whether it's compression, extension, or torsion springs, our innovative platform provides the tools you need to calculate spring constants, streamline your design process, and achieve engineering excellence. Don't wait—embrace the future with Spring Creator 5.0 today.