Urethane Rods

Designed for use in applications where corrosion, vibration, and magnetism prevent the use of a conventional steel spring.

Info

D₀ (mm) min max

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Part Number	D₀ (mm)	L₀ (mm)	DUR
PR0250120060A	6.35	305	60A
PR0250120070A	6.35	305	70A
PR0250120080A	6.35	305	80A
PR0250120090A	6.35	305	90A
PR0250120095A	6.35	305	95A
PR0375120060A	9.53	305	60A
PR0375120070A	9.53	305	70A
PR0375120080A	9.53	305	80A
PR0375120090A	9.53	305	90A
PR0375120095A	9.53	305	95A
PR0500120060A	12.70	305	60A
PR0500120070A	12.70	305	70A
PR0500120080A	12.70	305	80A
PR0500120090A	12.70	305	90A
PR0500120095A	12.70	305	95A
PR0625120060A	15.88	305	60A
PR0625120070A	15.88	305	70A
PR0625120080A	15.88	305	80A
PR0625120090A	15.88	305	90A
PR0625120095A	15.88	305	95A

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

Urethane rubber

Durometers of 60A, 80A, 90A, 95A.

SPEC urethane is compounded to provide optimum spring characteristics.

Loading application

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.

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.

* 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.

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