Formula symbols

Value

Unit

Description

Material

EN 10270-1

-

Type of material

Spring ends

Closed and ground

-

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

1.8

mm

Wire diameter

Di

mm

Inner coil diameter

D

7.2

mm

Mean coil diameter

De

9

mm

Outer coil diameter

Dd

5

mm

maximum diameter of mandrel

Dh

9.5

mm

minimum diameter of bush

L0

26

mm

unstressed spring length

Lk

mm

buckling length

Fn

276.056

N

maximum force in static use

Ln

18.77

mm

Minimum length in static use

sn

7.23

mm

Maximum spring deflection in static use

Fndyn

229.219

N

maximum force in dynamic use

Lndyn

20

mm

Minimum length in dynamic use

shdyn

2.27

mm

Maximum stroke in dynamic use

S

3.227

mm

pitch of spring

n

7.5

pc.

number of active coils

nt

pc.

total number of coils

R

38.203

N/mm

Spring rate

Weight

4.3224

g

weight of one spring

Fntol

26.34

N

(+/-) tolerance of maximum force in static use

Fndtol

25.86

N

(+/-) tolerance of maximum dynamic force

Detol

0.2

mm

(+/-) tolerances of outer coil diameter

L0tol

0.58

mm

(+/-) tolerance of unstressed spring length

Price group

G

-

price group

F1tol

N

(+/-) tolerance of prestressed spring force

F2tol

N

(+/-) tolerance of loaded spring force