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

0.9

mm

Wire diameter

Di

mm

Inner coil diameter

D

14.1

mm

Mean coil diameter

De

15

mm

Outer coil diameter

Dd

12.6

mm

maximum diameter of   mandrel

Dh

16.4

mm

minimum diameter of   bush

L0

39.2

mm

unstressed spring   length

Lk

mm

buckling length

Fn

22.328

N

maximum force in static   use

Ln

6.42

mm

Minimum length in   static use

sn

32.78

mm

Maximum spring   deflection in static use

Fndyn

20.608

N

maximum force in   dynamic use

Lndyn

8.95

mm

Minimum length in   dynamic use

shdyn

11

mm

Maximum stroke in   dynamic use

S

10.943

mm

pitch of spring

n

3.5

pc.

number of active coils

nt

pc.

total number of coils

R

0.681

N/mm

Spring rate

Weight

1.2251

g

weight of one spring

Fntol

1.73

N

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

Fndtol

1.72

N

(+/-) tolerance of   maximum dynamic force

Detol

0.4

mm

(+/-) tolerances of   outer coil diameter

L0tol

2.05

mm

(+/-) tolerance of   unstressed spring length

Price group

C

-

price group

F1tol

N

(+/-) tolerance of   prestressed spring force

F2tol

N

(+/-) tolerance of   loaded spring force