The anti-vibration rubber spacer washers with through-hole are elastic elements designed to absorb shocks, dampen vibrations, reduce noise transmission and provide effective isolation between mechanical components, machinery and structures.
Thanks to their cylindrical shape with a central through-hole, these rubber anti-vibration spacers allow the creation of elastic connections using screws, bolts or other fastening systems, while maintaining the required distance between surfaces and helping to protect equipment from mechanical stress.
Larosi offers over 160 sizes already available, providing the widest range of rubber anti-vibration spacer washers in Europe, with numerous combinations of outer diameters, inner diameters and heights to meet the needs of different industrial sectors.
Anti-vibration and isolation functions
Rubber Anti-Vibration Spacer Washers exploit the elastic properties of the material to attenuate the mechanical stresses transmitted between two components.
When a machine generates vibrations, the rubber deforms elastically and dissipates part of the mechanical energy, helping to limit the propagation of oscillations to surrounding structures.
The use of these elements, such as Rubber Anti-Vibration Spacer Washers, provides several advantages:
- Vibration reduction: the washers attenuate the transmission of oscillations produced by motors, pumps, compressors and other equipment.
- Acoustic isolation: the reduction of structural vibrations helps to limit the noise transmitted through mechanical connections.
- Shock absorption: the elasticity of the rubber allows impacts and stresses to be cushioned, protecting the connected components.
- Equipment protection: the reduction of stresses can help limit wear, loosening and damage.
- Elastic spacing: the thickness of the washer allows two surfaces to be kept apart, avoiding direct contact between components when the assembly is correctly designed.
The effectiveness of the isolation provided by Rubber Anti-Vibration Spacer Washers also depends on the hardness of the rubber, the dimensions of the spacer, the applied load and the frequency of the vibrations and, above all, on correct sizing. The fastening of Rubber Anti-Vibration Spacer Washers must also be carried out in such a way as not to create rigid connections that would cancel the anti-vibration effect.
Applications of anti-vibration rubber spacer washers
Thanks to their ease of installation and dimensional versatility, cylindrical rubber anti-vibration buffers with through-hole are used in numerous industrial sectors and technical applications.
Industrial machinery and plants. They are used for the elastic mounting of electric motors, compressors, pumps, fans and operating machines, helping to reduce the vibrations transmitted to frames and support structures.
Air conditioning and ventilation systems. They can be installed in heating, ventilation and air conditioning systems to limit the propagation of vibrations and noise generated by the equipment.
Automotive and industrial vehicles sector. They find application as spacer and damping elements in mechanical connections, supports and some suspension systems, when the characteristics of the component are compatible with the expected stresses.
Household appliances and equipment. They can help reduce the vibrations generated by washing machines, dryers, small motors and other equipment with moving parts.
Marine sector. They are used as elastic separation and isolation elements in installations subject to vibration, compatible with environmental conditions and the type of rubber used.
Construction and plant engineering. They can be used to create spaced connections, elastic supports and isolation systems between structural elements, brackets and equipment.
Technical characteristics
Larosi anti-vibration spacer washers feature a cylindrical geometry with a smooth central through-hole, which allows mounting using common fastening systems.
The standard version has a body made of black natural rubber NR, available in different hardnesses to adapt to load conditions and elasticity requirements.
The main technical characteristics are:
- Standard material: natural rubber NR.
- Colour: black.
- Available hardnesses: 40, 55 and 70 Shore A, with tolerance ±5.
- Indicative operating temperature: from -40 °C to +80 °C.
- Geometry: cylindrical body with smooth central through-hole.
- Fastening: by means of screws, bolts or other compatible through elements.
Shore A hardness indicates the resistance of the rubber to penetration by a standardised indenter. A 40 Shore A rubber is softer and more deformable than a 70 Shore A rubber, which has greater stiffness.
The choice of hardness must take into account the static and dynamic load, the allowable deformation and the operating conditions.
Dimensions and size identification
Each anti-vibration spacer washer is identified by three fundamental dimensions:
- D – Outer diameter: represents the overall diameter of the washer.
- d2 – Through-hole diameter: indicates the inner diameter intended for the fastening system.
- h – Height or thickness: represents the distance between the two flat surfaces of the washer.
The combination of these three measurements makes it possible to identify the spacer most suitable for the installation requirements.
For applications that require verification of elastic performance, load diagrams relating to the individual codes can be requested, where available.
Synonyms and commercial names
Anti-vibration rubber spacer washers with through-hole are identified on the market by various names, which may vary according to dimensions, shape and application.
Among the most commonly used names we find:
- Rubber anti-vibration washers, when used to reduce the transmission of vibrations.
- Rubber spacers or rubber spacer washers, when their main function is to keep two surfaces apart.
- Cylindrical rubber buffers with through-hole, when they have a significant thickness relative to the diameter.
- Perforated rubber anti-vibration discs, when used as support and isolation elements.
- Rubber anti-vibration rings, when the annular geometry is the main characteristic.
- Rubber anti-vibration bushes, when inserted into mechanical connections or fastening systems.
- Rubber damping pads, when they mainly perform a shock-absorbing function.
- Rubber anti-vibration shims, when installed to compensate for distances and level differences.
These various names for Rubber Anti-Vibration Spacer Washers describe similar products, even if dimensional characteristics and performance may differ depending on the application.
Variants and special productions on request
In addition to the standard natural rubber versions, Larosi can evaluate the production of anti-vibration rubber spacer washers on request, with different materials and characteristics according to specific application requirements.
The main variants that can be produced include:
Nitrile rubber NBR. This compound is used when greater resistance to contact with oils, fuels and certain chemical substances is required.
EPDM rubber. This material is particularly suitable for applications that require resistance to ozone, weathering and elevated temperatures, within the limits of the selected compound.
Custom dimensions. Productions with outer diameters, through-holes and heights different from the standard sizes can be evaluated.
Specific hardnesses. Depending on quantities and technical requirements, compounds with particular elastic characteristics can be evaluated.
The feasibility of special executions depends on the required characteristics, quantities and operating conditions.
Over 160 sizes available: the widest range in Europe
With over 160 sizes already available, Larosi offers the widest European range of rubber anti-vibration spacer washers with through-hole.
The breadth of Larosi’s range of rubber anti-vibration spacer washers makes it possible to find numerous combinations of outer diameter, inner diameter and height, reducing the need to resort to special components and, above all, allowing them to be found immediately in stock for prompt delivery.
The availability of numerous sizes enables the selection of the Rubber Anti-Vibration Spacer Washers most suited to the construction characteristics of the equipment, facilitating design, maintenance and replacement operations.
Consult the Larosi range of anti-vibration rubber spacer washers with through-hole to identify the available sizes or contact our sales office to request technical information, quotations and evaluations relating to customised productions.
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