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Supersoft Urethane Bushings / SB 2520-1210 Series


      Low creep rate compared to other polymers. (Rubber, neoprene, silicone etc.)
      Superior damping coefficient over a very wide temperature range.
      Can absorb shock efficiently for millions of cycles.
      Temperature Ranges: -15C to 98C.

Bushings can isolate vibration and absorb shock.

This material is a soft visco-elastic polymer. Visco-elastic means that a material exhibits properties of both liquids (viscous solutions) and solids (elastic materials).

It has the properties of a thermoset, polyether-based, polyurethane material. The material combines shock absorbtion, good memory, vibration isolation and vibration damping characteristics. In addition it is a very effective acoustic damper and absorber. While many materials exhibit one of these characteristics, it combines all of them in a stable material with a long fatigue life.

Using two bushings together or a bushing and washer(s), you can create a floating bolt that isolates the unit from any metal-to-metal contact.

Different shores allow for different spring rates. Load ratings assume a 10% - 20% deflection of the material. This deflection is achieved by a combination of system weight and torquing of the connecting bolts.

Do not over torque the bolts as this defeats the intended vibration isolation and shortens bushing life. Use a high-quality (thread deforming) lock nut or doubled jam nuts to prevent vibration from loosening the bolt.

Unlike other products, bushings may be used in tension connections.

Part Number A (mm) B (mm) C (mm) D (mm) E (mm) Datasheet
SB1210/1 12.7 - 4.8 5.7 - Download
SB1210/2 12.7 5.7 4.8 3.15 10.0 Download
SB2520/1 25.4 - 9.6 11.4 - Download
SB2520/2 25.4 11.4 9.6 6.3 20.0 Download

To order: Specify part number, shore, quantity & colour. Colour black is standard.
Other colours and dimensions are available to special order.

Material Properties

* Reduced strength and damping up to 120C. Increased spring rate down to glass transition temperature.
** Underwriters Laboratory 94 Compatibility.
*** Modified for the effects of material tack.
^ At 50 hertz. Transmission loss increases with frequency.


All specifications shown herein are typical values and are not guaranteed.  It is recommended to test in application for suitability.



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