Formula symbolsValueUnitDescription
Material
EN 10270-1
-
Type of material
Spring ends
Closed
-
Spring ends
F1
N
prestressed spring force
L1
mm
Prestressed spring length
s1
mm
Prestressed spring deflection
F2
N
Loaded spring force
L2
mm
Loaded spring length
s2
mm
Loaded spring deflection
d
0.32
mm
Wire diameter
Di
mm
Inner coil diameter
D
4
mm
Mean coil diameter
De
4.32
mm
Outer coil diameter
Dd
3.2
mm
maximum diameter of mandrel
Dh
4.8
mm
minimum diameter of bush
L0
7
mm
unstressed spring length
Lk
mm
buckling length
Fn
3.213
N
maximum force in static use
Ln
2.19
mm
Minimum length in static use
sn
4.81
mm
Maximum spring deflection in static use
Fndyn
3.125
N
maximum force in dynamic use
Lndyn
2.32
mm
Minimum length in dynamic use
shdyn
1.29
mm
Maximum stroke in dynamic use
S
2.48
mm
pitch of spring
n
2.5
pc.
number of active coils
nt
pc.
total number of coils
R
0.668
N/mm
Spring rate
Weight
0.0359
g
weight of one spring
Fntol
0.34
N
(+/-) tolerance of maximum force in static use
Fndtol
0.38
N
(+/-) tolerance of maximum dynamic force
Detol
0.2
mm
(+/-) tolerances of outer coil diameter
L0tol
0.43
mm
(+/-) tolerance of unstressed spring length
Price group
B
-
price group
F1tol
N
(+/-) tolerance of prestressed spring force
F2tol
N
(+/-) tolerance of loaded spring force