Custom Rubber Vibration Isolation Mounts

Rubber vibration isolation mounts are compact elastomeric components positioned between equipment and support structures to reduce transmitted vibration and shock. The pictured parts are black, circular mounts with tapered outer sides and a central through-hole. Rubber grade, hardness, dimensions, load capacity, static deflection, and isolation performance are available upon request.

Product Overview

These mounts consist of a rubber cylinder bonded between metal end plates or threaded studs, forming what is commonly known in the industry as a cylindrical or bobbin-style vibration isolator. When installed beneath or alongside operating machinery, the rubber body compresses and flexes in response to mechanical vibration, converting that vibrational energy into heat through internal material damping rather than transmitting it directly into the supporting structure. This design allows equipment such as motors, fans, pumps, and compressors to operate with significantly reduced noise transmission and structural fatigue compared to a rigidly mounted installation.

Key Features

• Rubber cylinder bonded directly to metal mounting plates, providing a durable, long-lasting connection between the rubber body and the surrounding hardware.
• Compact cylindrical profile suited for compression and multi-directional shear loading in compact equipment installations.
• Available in male-to-male, male-to-female, and female-to-female threaded stud configurations to match different mounting hardware requirements.
• Compound options including natural rubber, neoprene, and EPDM, each offering different combinations of flexibility, oil resistance, and temperature tolerance.
• Load rating and stiffness values engineered to match specific equipment weight and operating frequency requirements.

Understanding How Vibration Isolation Mounts Work

The core principle behind rubber vibration isolation relies on the relationship between a mount’s natural frequency and the operating frequency of the equipment being isolated. Effective isolation is generally achieved when the mount’s natural frequency sits well below the equipment’s disturbing frequency, with a commonly cited target ratio requiring the natural frequency to be roughly one-third of the operating frequency to achieve approximately 80 percent isolation efficiency. Because natural frequency is directly determined by how much a mount deflects under a given load, selecting the correct mount requires matching its static deflection characteristics to the actual weight distributed across each mounting point, rather than relying on load rating alone.

Material Selection and Performance Considerations

Natural rubber remains a widely used compound for these mounts due to its excellent elasticity, cost efficiency, and strong resistance to abrasion and general atmospheric conditions, including ultraviolet exposure and ozone. Where oil or fuel contact is a concern, neoprene compounds offer improved chemical resistance compared to natural rubber, while EPDM compounds are frequently selected for applications requiring stronger performance under elevated temperatures or prolonged outdoor exposure. It is worth noting that rubber creep increases significantly at elevated temperatures, with some compounds exhibiting two to nine times greater creep at 60 degrees Celsius compared to standard ambient conditions, a factor worth accounting for in continuous high-temperature installations.

Sizing and Load Rating Guidance

Correct mount selection begins with calculating the load distributed across each individual mounting point, generally by dividing total equipment weight by the number of mounts used in the installation, and then confirming the selected mount operates within roughly 60 to 80 percent of its maximum rated load capacity. Exceeding a mount’s rated maximum load is strongly discouraged, since sustained overloading can lead to premature material fatigue and a significantly reduced service life. For applications involving substantial horizontal or shear forces, such as reciprocating compressors or unbalanced fan assemblies, confirming that the selected cylindrical mount is rated for multi-directional shear loading, not just vertical compression, is an important step in the selection process.

Common Applications

• Electric motor, fan, and small pump installations requiring compact, multi-directional vibration damping.
• HVAC equipment mounting points where reduced noise and vibration transmission into building structures is a priority.
• Industrial compressor and machinery installations requiring shock absorption alongside continuous vibration isolation.
• Generator and engine mounting systems benefiting from combined vibration and structural fatigue reduction.
• General mechanical equipment platforms requiring a compact, bonded rubber-to-metal isolation solution.

Frequently Asked Questions

Which rubber material should be used for a vibration isolation mount?

Material selection depends on the temperature, oil or chemical exposure, outdoor environment, required stiffness, damping, compression set, and fatigue resistance. The compound cannot be selected from appearance alone. Complete operating conditions should be provided for evaluation.

How is the correct Shore A hardness selected?

Hardness should be considered together with mount diameter, height, shape factor, load per mount, static deflection, and excitation frequency. Selecting hardness without load and vibration data may result in insufficient isolation, excessive movement, or premature deformation.

Can the mount dimensions and central hole be customized?

Outer diameter, height, taper, central hole diameter, edge geometry, and dimensional tolerance can be evaluated for custom production. Provide the equipment mounting layout, fastener dimensions, available space, and load data before confirming the final design.

What load can the rubber mount support?

No load rating has been confirmed for the pictured mount. Capacity depends on the rubber compound, hardness, dimensions, compression area, allowable deflection, temperature, dynamic loading, and safety requirements. Static and dynamic loads must be provided before evaluation.

How should a rubber vibration isolation mount be installed?

The mount should normally be positioned between the equipment and its support so the intended load passes through the rubber body. Fasteners should secure the assembly without creating an unintended rigid path that bypasses the isolating element. Final installation depends on the equipment design.

Are samples, tooling, MOQ, and lead time available?

Sample availability, tooling, MOQ, and lead time are available upon request. They depend on the dimensions, material, hardness, tolerance, quantity, load requirements, prototype testing, and packaging specification.

Request Product Evaluation

Provide the mount dimensions, equipment weight, number of mounting positions, load per mount, excitation frequency, required deflection, material, hardness, installation method, operating environment, and estimated quantity. A drawing, sample, or mounting layout will help evaluate the geometry, compound, tooling, prototype, and performance requirements.