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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

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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/F_1.0 and the spring length ratio S/h₀ (S_1.0 = H₀)

Graph 35.2: Effect of ambient temperature on the spring force

Dimensions according to DIN 2093

Polysorb disk springs

De [inch]:
Di [inch]:

Part no.	Standard values: Spring deflections and spring forces
	D_e	D_i	t	h₀	S_0.25	F_0.25	S_0.5	F_0.5	S_0.75	F_0.75	F_1.0	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	2.86 USD
JTEM-06	12.5	6.2	0.7	0.3	0.08	3	0.15	5.1	0.23	8	10	0.11	2.86 USD
JTEM-08	16	8.2	0.9	0.35	0.09	4	0.18	8	0.28	11	16	0.2	3.11 USD
JTEM-10	20	10.2	1.1	0.45	0.11	5	0.22	10	0.33	15	24	0.33	3.61 USD
JTEM-12	25	12.2	1.5	0.55	0.14	9	0.28	18	0.42	27	45	0.85	4.30 USD
JTEM-16	31.5	16.3	1.75	0.7	0.18	15	0.35	32	0.53	51	65	1.44	5.10 USD
JTEM-20	40	20.4	2.25	0.9	0.23	35	0.45	70	0.68	110	130	3.1	6.34 USD
A500TEM-05	10	5.2	0.5	0.25	0.06	1	0.13	2.4	0.19	3.6	8	0.04	4.73 USD
A500TEM-06	12.5	6.2	0.7	0.3	0.08	3	0.15	5.1	0.23	8	15	0.11	4.73 USD
A500TEM-08	16	8.2	0.9	0.35	0.09	4	0.18	8	0.28	11	24	0.2	5.42 USD
A500TEM-10	20	10.2	1.1	0.45	0.11	5	0.22	10	0.33	15	35	0.33	5.98 USD
A500TEM-12	25	12.2	1.5	0.55	0.14	9	0.28	18	0.42	27	70	0.85	4.53 USD
A500TEM-16	31.5	16.3	1.75	0.7	0.18	15	0.35	32	0.53	51	85	1.44	7.52 USD
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
D_e	= Outer diameter [in]
D_i	= Inner diameter [in]
t	= Thickness of the single disc [in]
h₀	= Maximum downward deflection of spring [in]
S_0.25	= 25% of the maximum downward deflection [in]
F_0.25	= Spring force with 25% downward deflection [N]
S_0.5	= 50% of the maximum downward deflection [in]
F_0.5	= Spring force with 50% downward deflection [N]
S_0.75	= 75% of the maximum downward deflection [in]
F_0.75	= Spring force with 75% downward deflection [N]
F_1.0	= Spring force with 100% downward deflection [N]
M	= Weight of a single disc [oz

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