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Technical data - Compression springs - range A & B

Material

Music wire:
DIN 17223 C-Wire WERKSTOFF NO. 1.200
Working temperature between -30 ºC and +120 ºC

The wire is not rustproof. The wire is protected, so the spring can be placed in a warm, dry storeroom. Rustproofing should be performed by the customer as required.   

Stainless steel:
DIN 17224 AISI 302 WERKSTOFF NO. 1.4310
Working temperature between -200 ºC and +250 ºC

 
Tolerances

Range A: (The A Range consists of springs with 5 digits, ie: "12200")
Forces in accordance with DIN 2095 (Grade 2). All dimensions in accordance with DIN 2098 (Grade 2).

DIN 2098:
DIN 2098 defines the spring's dimensions based on wire thickness.

Table 1 (Sheet 1): Wire thickness 0.5mm >= 10mm.
Table 2 (Sheet 2): Wire thickness < 0.5mm. 

Contact Sodemann Industrifjedre A/S for further information.

DIN 2095: 
DIN 2095 defines the force as the determining parameter. The number of coils may therefore vary and will consequently not be stated in the tables.

Range A L0 Tolerance in mm
L0 is for guidance only and may well be longer than stated in the tables. Deviations are usually observed in a large coil ratio (Dm/d), where the spring has a thin wire in relation to the diameter. Once loaded the spring will set itself and thus achieve the correct force at the correct travel.















 
 
Range A Dm Tolerance in mm
Dm Gütegrad 2  
Coil ratio W
From To 4  -  8
+ / -
8  -  14
+ / -
14  -  20
+ / -
0,63
1,00
1,60
1,00
1,60
2,50
0,07
0,08
0,10
0,10
0,10
0,15
0,15
0,15
0,20
2,50
4,00
6,30
4,00
6,30
10,00
0,15
0,20
0,25
0,20
0,25
0,30
0,25
0,30
0,35
10,00
16,00
25,00
16,00
25,00
31,50
0,30
0,35
0,40
0,35
0,45
0,50
0,40
0,50
0,60
31,50
40,00
50,00
40,00
50,00
63,00
0,50
0,60
0,80
0,60
0,80
1,00
0,70
0,90
1,10
63,00
80,00
100,00
80,00
100,00
125,00
1,00
1,20
1,40
1,20
1,50
1,90
1,40
1,70
2,20
125,00
160,00
160,00
200,00
1,80
2,10
2,30
2,90
2,70
3,30

 

Range B: (The B Range consists of springs with 11 digits and 2 letters, ie: "C07200853000M")
External dimensions in accordance with the following tables:

Range B External diameter Tolerance in mm
1,45 - 3,02mm +/- 0,08mm   31,14 - 37,08mm +/- 0,76mm
3,05 - 6,10mm +/- 0,13mm 37,11 - 50,08mm +/- 1,02mm
6,12 - 12,70mm +/- 0,20mm Tolerance på kraft:
12,73 - 25,40mm +/- 0,38mm Fn (N) +/- 10%
25,43 - 31,12mm +/- 0,51mm R (N/mm)  +/- 10% 
 
L0 Length Tolerance
3,05 - 25,40mm +/- 0,79mm
25,41 -38,10mm +/- 1,58mm
38,11 - 88,90mm +/- 3,18mm
Fra 88,91mm +/- 4,78mm

On this range, the number of coils is not shown, because the spring is produced after the force as the primary measurement. Therefore the variation in wire size, through tolerance or availability, will always have an effect on the number of coils. 


 
Terminology

d = Wire diameter in mm
De = External diameter (D+d)
D = Mean diameter in mm (De minus d)
Di = Internal diameter in mm (De minus 2xd)
n = Number of effective elastic coils
nt = Coils total (n+2)
L0 = Free unloaded length. Lo is for guidance only. Lo can vary slightly.
L1 = Loaded length in mm at F1
L2 = Loaded length in mm at F2
Ln = Max. loaded length in mm (min. length/max. load)
F1 = Partial load in N (Newtons) at L1
F2 = Additional load in N (Newtons) at L2
Fn = Maximum load in N (Newtons) at Ln (should not be used)
sn = Maximum travel (compression) in mm (Lo-Ln) (should not be used)
R = Spring constant in N/mm
Dd = Arbor diameter over which the spring can work
Dh = Hole diameter in which the spring can work
1 N = 0,10197 Kp
1 Kp = 9,80665 N

Trykfjedre
 
Calculation of spring force

Fn for stainless steel spring steel is approx. 0.88 x Fn for music wire.

Calculation of spring force at a given length is travel s * R

If compression springs with a very high spring constant/carrying capacity are required, coloured die springs are recommended.

 
Configuration of ends

Range A:
Wire up to and including 0.8 mm is closed, but unground
Wire from 1.0 mm is closed and ground

Range B:
Wire up to and including 2,24 mm is closed, but unground
Wire up to and including 3,05 mm is closed and ground

 
Winding direction

Normally right-handed

 
Misc.

If the springs are compressed to Ln, the spring will set itself. It will then not return to its original length, L0.  

Always dimension a spring so that it delivers the desired travel and force with as little exertion as possible. This prolongs the service life of the spring. Applying maximum load to the spring will shorten its service life and cause it to become permanently distorted. 

Go to the selection of Compression springs

 
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Friday: 08.00 - 15.30


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