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  EXTENSION SPRING  
 
 
1) Overview
Space can be efficiently used and the initial length of the spring can be effectively used.
Extension spring is commonly used like compression spring and has various hook shape
according to the application.
 
 
2) Application
Components for automobile, electrical, electronic, stationery, toy, industry, and information-
communication
 
 
3) Shape
It has hooks at the both ends.
 
4) Manufacturing capability
We manufacture extension springs with a diameter of Ø 0.2mm to Ø 6mm.
 
5) Others
Plating, coloring, power coating etc available
 
6) Symbols used for extension spring design
 
Item Symbol Item Symbol
shear modulus
G
mounting length
I
wire diameter
d initial load
Po
outside diameter
Do initial stress
mean coil diameter
Dm Load
P
inside diameter
Di
spring constant
K
total number of coils
Nt
index ratio
C
number of active coils
Ne stress correction coefficient
k'
free length
L shear stress
tensile strength
   
 
a) Spring constant :  K = G *  d ³ / 8 * Ne * Dm ³
b) Initial load : Po = π * d ³ *  / 8 * Dm  (Refer to the graph below for .)
c) Load : P = K * (L - l) + Po
d) Stress correction coefficient : k' = {(4 * C-1) - (4 *C-4)}+(0.615/C)
e) = k' * 8 * Dm * P/ π * d ³
f) Stress ratio =   /  
 
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