Extension Springs

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EXTENSION SPRINGS

Extension Spring Technical Information

Extension Spring Terminology Formula Key
Symbol	Meaning
R =	Rate per Inch
P =	Load in pounds
S =	Stress (uncorrected)
H =	Solid height
G =	Torsional modulus of elasticity
p =	Pitch
M =	Moment or torque, in-lb
E =	Modulus of elasticity
n =	Active coils
N =	Total coils
D =	Mean diameter of coil
d =	Diameter of wire
p =	Pi, 3.14
L =	Free length
T =	Revolutions of spring
Torsional Modulus of Elasticity Data
S_K=	Corrected stress
Steel	11.5 x 10⁶
Stainless Steel	10 x 10⁶
Chrome Vanadium	11.5 x 10⁶
Chrome Silicon	11.5 x 10⁶
Phosphor Bronze	6.25 x 10⁶
Brass	5.5 x 10⁶

Use compression rate and stress formula for calculating extension springs.
1.75 x ID = Height of regular hooks (devide by 2 for one end).

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