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Extension
Spring Terminology
Click
here
to see a Glossary of Spring Terms.
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 |
|
SK= |
Corrected
stress |
Torsional Modulus
of Elasticity Data
|
|
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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