Solid Height

Solid Height

= (Number of
    Coils – 0.25) x
    Wire Diameter

For example, for a spring with 14 coils and a wire diameter of 0.5”, the Solid Height would be calculated as follows:

Solid Height

= (14 – 0.25) x 0.5
= 6.875
 

Rate

Rate

= Load (lbs.) ÷
    Spring
    Deflection (in.)

For example, if a spring deflects by 2.75” under a load of 300 lbs, the Rate would be calculated as follows:

Rate

= 300 ÷ 2.75
= 109
 

Deflection

= Load (lbs) ÷ Rate

For example, a spring under a load of 300 lbs with a 109 Rate, the deflection would be calculated as follows:

Deflection

= 300 ÷ 109
= 2.75
 

Load

= Deflection x Rate

For example, a spring with a 109 Rate and a 2.75” deflection, the load would be calculated as follows:

Deflection

= 2.75 ÷ 109
= 300

Combined Spring Rate

This is used when two springs are stacked on top of each other.

Combined Spring Rate =
(Spring Rate 'A' x Spring rate 'B')
÷ (Spring Rate 'A'+Spring Rate 'B')

For example if the rate for spring 'A' is 200 and the rate for spring 'B' is 500, the combined rate is calculated as follows:

Combined Spring Rate =
(200x500) ÷ (200+500) = 143