Spring Creator spring calculator  logo Custom Instant Spring Quote Stock Spring Finder Logo



 Made in U.S.A.  Español Ph 951-276-2777

Visible on Tablets and Smartphones

Spring Constant Units Calculator

 Definition:

The units of measurement for the constant amount of force per unit of travel a compression or extension spring is able to exert, is measured in pounds of force per inch (lbf/in) or newtons per millimeter (N/mm). For torsion springs, the spring constant (torque) units are inch-pounds of torque per 360º (degrees) or inch-pounds of torque per degree; newtons per millimeter per 360º (degrees) or newtons per millimeter per degree in the metric system.


NEW!!  

 Buy Stock Springs at The Spring Store  by Acxess Spring

 stock spring promotion banner with the spring store logo, a box of springs, and some text


Get our New Free Spring Creator App for both Android and iOS Deviceslink to download spring creator on google play store link to download spring creator on the apple app store


Wondering What Your Spring Will Cost
?
Send Us A Quick Quote


            Name:                
Part Description:
                      Quantity:

             Email:                
Phone #:






 Compression And Extension Spring Rate: 

Spring constant units in extension and compression springs offer a linear force. Spring constant k is the master of your compression or extension spring design. You must consider the load you will be applying on the spring and how much deflection or travel you expect from your spring under that load. The spring constant units for load are pounds of force (lbf) or newtons (N) in the metric system of measurement. Spring constant units for travel are inches (in) or millimeters (mm). The formulas and diagrams provided below will help you calculate your compression or extension spring’s constant.

 

Constant Formula A.)

To calculate how much spring constant you need.


X = distance traveled

F = load

k = rate


k = F ÷ X


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)


Example of how to calculate spring constant with spring under working loads and formula



  Torsion Spring Constant:

When it comes to torsion springs the force is radial. In this case, torsion spring rate is the amount of constant force or torque your torsion spring exerts per every 360 degrees of deflection (travel) or 1º degree of deflection. The formulas and diagrams provided below will help you calculate your torsion spring rate.

 

Torque Formula A.)

To calculate torsion spring rate per 360º (degrees).


d = Wire Diameter

D = Mean Diameter

N = Active Coils

E = Modulus of Elasticity

R = Rate per 360 Degrees (lbf/360º)

R2 = Rate per Degree (lbf/1º)


R = Ed^4 / 10.8 DN

R2 = R ÷ 360


Torque Formula B.)

To calculate how much torsion spring rate per degree you need.


k2 = Rate per Degree

X = Distance Traveled

F = Torque or Load


k = F ÷ X


Example of how to calculate spring constant with spring under working torques and rate per degree formula


Acxess Spring, 2225 E. Cooley Dr. Colton, CA 92324

Ph: (951)276-2777 Fx: (951)240-3334 Email: sales@acxesspring.com