Urethane Springs
Stock sizes in multiple durometers
Associated Spring Stock Urethane compression springs are designed to
complement our steel wire springs. These springs are designed for use in
applications where corrosion, vibration, and magnetism prevent the use of a
conventional steel spring. The SPEC line of urethane springs feature multiple
durometers. This allows various load capacities within each specific size. SPEC
urethane springs are compounded specially for optimized spring characteristics.
Typical applications include vibration dampening, corrosive environments, high
loads in confined spaces, cycle and static loading and nonmagnetic requirements.
Properties
- Water and oil resistant.
- Nonmagnetic.
- 360 degree contact area.
- Bondable to mating parts.
- Can be mated to soft materials.
- Series stackable for additional deflection with use of spacers.
Material
Durometers of 60A, 80A, 90A, 95A.
SPEC urethane is compounded to provide optimum spring characteristics.
Loading Applications
Urethane is a noncompressible material. The load of a urethane spring is
obtained by bulging of the tube walls. Most of the bulging is to the outside
diameter. The growth in outside diameter is approximately equal to the
percentage of spring deflection. Example: A 1.00" spring is deflected 0.20" or
20%. Increase the outside diameter by 20%. A spring with an initial outside
diameter 0.750" would bulge to 0.90". This expansion should be considered when
selecting O.D. clearances.
Note: Load data shown is from laboratory testing. Load-deflection curves for
95A durometers are not provided due to extremely high spring rates. 95A
durometer is recommended for cushioning applications only.
Inside Diameters
Urethane springs can be guided through the I.D. by a rod. The rod can be that
of the size listed in the data tables for an interference fir whereby the spring
I.D. grips the rod. Or, the rod can be reduced for a free fit.
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