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Polysorb - disc springs

Spring washers are discs that can be axially loaded and are concave in the axial direction. Polysorb disc springs require less space than other spring types. They are especially suitable for designs that do not require a high spring length.

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When to use Polysorb disc springs

Compensation for axial clearances and manufacturing tolerances

Vibration dampening

Noise dampening

Anti-magnetic

Electrical and thermal insulation

When no corrosion problems should arise

No lubrication necessary

Lightweight

Low profile dimensions

Maintenance-free

When not to use them

When constant spring forces are necessary over wide temperature ranges

When high spring forces are required


The spring length of the disc spring is relatively small. In practice, a number of disc springs are combined. Disc springs that are alternately stacked increase the spring length proportionally to the amount of springs. The total spring force is as large as the force of one single disc spring. In order to increase the force, the disc springs can be parallel stacked to form a spring packet.

Chemical resistance

Polysorb disc springs are acid-resistant against diluted lyes and very weak acids, as well as against fuels and all types of lubricants. The small moisture absorption permits the use in wet or moist environments.

Medium Resistance
Alcohol Resistant
Chlorinated hydrocarbon Resistant
Ester Not resistant
Fats, oils Resistant
Ketone Conditionally resistant
Fuels Resistant
Weak acids Conditionally resistant
Strong acids Not resistant
Weak alkalis Conditionally resistant
Strong alkalis Conditionally resistant

Moisture absorption

Polysorb disc springs absorb moisture, which alters their mechanical properties. However, in the worst case scenario - a long-term application in water - Polysorb disc springs still have a maximum spring force of 2.24 lbs.

Increased temperatures

Increased temperatures reduce the rigidity of plastics. Polysorb disc springs still have a maximum spring force of 1.80 lbs even at the maximum permissible temperature of 176°F. The spring force in ambient temperature is shown in graph 35.2 (right).

 
Polysorb disc springs in a fatigue test

Polysorb disc springs in a fatigue test

 

Graph 35.1: Experimental test results between the force ratio F/F1.0 and the spring length ratio S/h0 (S1.0 = H0)

 

Graph 35.2: Effect of ambient temperature on the spring force

 
 
 

Dimensions according to DIN 2093

Polysorb disk springs

Part No.:
De [inch]:
Di [inch]:
Part no. Standard values: Spring deflections and spring forces
  De Di t h0 S0.25 F0.25 S0.5 F0.5 S0.75 F0.75 F1.0 M    
  [mm] [mm] [mm] [mm] [mm] [N] [mm] [N] [mm] [N] [N] [g]    
 JTEM-05 10 5.2 0.5 0.25 0.06 1 0.13 2.4 0.19 3.6 5 0.04 2.33 USD 
 JTEM-06 12.5 6.2 0.7 0.3 0.08 3 0.15 5.1 0.23 8 10 0.11 2.05 USD 
 JTEM-08 16 8.2 0.9 0.35 0.09 4 0.18 8 0.28 11 16 0.2 2.53 USD 
 JTEM-10 20 10.2 1.1 0.45 0.11 5 0.22 10 0.33 15 24 0.33 2.94 USD 
 JTEM-12 25 12.2 1.5 0.55 0.14 9 0.28 18 0.42 27 45 0.85 3.50 USD 
 JTEM-16 31.5 16.3 1.75 0.7 0.18 15 0.35 32 0.53 51 65 1.44 4.15 USD 
 JTEM-20 40 20.4 2.25 0.9 0.23 35 0.45 70 0.68 110 130 3.1 5.16 USD 
 A500TEM-05 10 5.2 0.5 0.25 0.06 1 0.13 2.4 0.19 3.6 8 0.04 3.85 USD 
 A500TEM-06 12.5 6.2 0.7 0.3 0.08 3 0.15 5.1 0.23 8 15 0.11 3.85 USD 
 A500TEM-08 16 8.2 0.9 0.35 0.09 4 0.18 8 0.28 11 24 0.2 Upon request 
 A500TEM-10 20 10.2 1.1 0.45 0.11 5 0.22 10 0.33 15 35 0.33 Upon request 
 A500TEM-12 25 12.2 1.5 0.55 0.14 9 0.28 18 0.42 27 70 0.85 Upon request 
 A500TEM-16 31.5 16.3 1.75 0.7 0.18 15 0.35 32 0.53 51 85 1.44 Upon request 
 A500TEM-20 40 20.4 2.25 0.9 0.23 35 0.45 70 0.68 110 150 3.1 Upon request 
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The standard values for the spring deflections and spring forces feature rounded average values.
Formula symbol, description and units:

F = Force
S = Spring deflection
De = Outer diameter [in]
Di = Inner diameter [in]
t = Thickness of the single disc [in]
h0 = Maximum downward deflection of spring [in]
S0.25 = 25% of the maximum downward deflection [in]
F0.25 = Spring force with 25% downward deflection [N]
S0.5 = 50% of the maximum downward deflection [in]
F0.5 = Spring force with 50% downward deflection [N]
S0.75 = 75% of the maximum downward deflection [in]
F0.75 = Spring force with 75% downward deflection [N]
F1.0 = Spring force with 100% downward deflection [N]
M

= Weight of a single disc [oz