Sandwich Mount Rubber-Metal Rails

The sandwich mount rubber-metal rails from Larosi Srl represent the immediate solution for those looking for reliable anti-vibration components, available in stock and ready for shipping.

Whether you need a sandwich mount rubber-metal rail with 1 metal side for light-duty applications or a version with 2 metal sides for heavy industrial plants, the immediate availability and fast delivery times make the difference — especially when every hour of machine downtime has a cost.

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What are sandwich mount rubber-metal rails

A sandwich mount rubber-metal rail is a structural isolation element composed of a layer of vulcanized elastomeric rubber bonded to one or two metal inserts (typically galvanized steel). Its linear geometry — unlike classic feet or cylindrical mounts — allows uniform load distribution along the entire length of the component, making it ideal for machine bases, crossbeams, and support structures in industrial equipment.

How it works

The elastomeric rubber is the core of the system: thanks to its ability to deform elastically under load, it absorbs mechanical vibrations generated by motors, compressors, pumps, and other machinery, converting vibrational energy into dissipated heat. The practical result is threefold:

• Vibration absorption: it reduces the transmission of mechanical energy to adjacent structures, protecting components from premature wear and material fatigue.
• Acoustic insulation: vibrations that are not transmitted become noise that is not generated, with a direct effect on reducing structural and airborne noise.
• Structural protection: the mechanical decoupling between the machine and its base preserves bolts, welds, and metal structures from cyclic stress that would otherwise lead to cracks or failures over time.

The sandwich mount rubber-metal rail is therefore not just a component for acoustic comfort: it is an engineering element with a direct impact on the service life and reliability of industrial plants.

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Types of sandwich mount rubber-metal rails available

Larosi supplies both sandwich mount rubber-metal rails with 1 metal side and rails with 2 metal sides, guaranteeing immediate stock availability and fast delivery times across the entire country.
Larosi maintains high stock levels of sandwich mount rubber-metal rails ready in the most requested industrial sizes: order the sandwich mount rubber-metal rails you need now and avoid the typical lead times of custom products.

Standard-quality natural rubber sandwich mount rails with hardness of approximately 70°, 55° and 45° Shore. The mounts cover a load range from 300 N to 775 kN, depending on the profile type used and the length of the support.

Sandwich mount rubber-metal rail with 1 metal side

The single-metal-side rail features a layer of elastomeric rubber bonded on one side only to a galvanized steel plate or sheet. The free rubber side is typically placed in contact with the support surface, while the metal plate is fixed to the machine frame by bolts or structural adhesive.

Typical applications:

• Low- and medium-power electric motors
• Industrial fans and extractors
• Small hydraulic and pneumatic pumps
• Laboratory equipment and instrumentation
• Residential and commercial HVAC systems

Main advantages:

• Greater flexibility and damping capacity
• Simplified installation with a single metal fixing point
• Affordable cost, ideal for quick maintenance replacements

When to choose the 1-side version: when the priority is to maximize vibration isolation and the application involves moderate loads with fixing constraints on one side only.

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Sandwich mount rubber-metal rail with 2 metal sides

The double-metal-insert version features the elastomeric rubber sandwiched between two galvanized steel plates. Both metal faces provide bolted fixing points, ensuring a solid and well-defined bidirectional constraint.

Typical applications:

• Industrial compressors and refrigeration units
• Generators and power generator sets
• Presses, machine tools, and CNC machining centers
• Automated production lines
• High-flow pumping systems
• Metal structures subject to high dynamic loads

Main advantages:

• Greater system rigidity and dimensional stability under load
• Secure fixing on both faces, ideal for applications with lateral or tensile forces
• Predictable behavior under intense cyclic loads
• Suitable for installations where misalignment is critical

When to choose the 2-side version: when the machine generates intense vibrations, the structure requires rigid bilateral fixing, or the industrial context involves high loads and extended duty cycles.

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Applications of sandwich mount rubber-metal rails

The sandwich mount rubber-metal rail is used in every industrial sector where rotating, reciprocating, or impulsive machinery is present. Below are the main application families, with the specific needs that the component solves.

Industrial compressors

In reciprocating and centrifugal compressors, vibrations generated by the piston or blades are transmitted to the base and piping. Using sandwich mount rubber-metal rails on the support plane drastically reduces the transmission of these impulses, protecting joints and extending the service life of valves.

Typical case: vibration reduction on industrial air compressors installed on concrete slabs.

CNC machines and machining centers

Precise tool positioning depends on the dynamic rigidity of the system. Sandwich mount rubber-metal rails on the machine base filter external vibrations (adjacent production, vehicle traffic) without introducing static deflections, preserving machining quality.

Typical case: isolation on CNC machine bases in mechanical workshops.

Electric motors

Asynchronous motors generate harmonic vibrations linked to the power supply frequency and number of poles. Sandwich mount rubber-metal rails interrupt the propagation path toward the frame or carpentry, reducing noise and structural stress.

Hydraulic and pneumatic pumps

In hydraulic systems, pressure pulsations add to mechanical vibrations. Proper selection of the sandwich mount rubber-metal rail — based on the excitation frequency — prevents resonance phenomena that lead to pipe and fitting failures.

Generators and power generator sets

Power generator sets are broadband vibration sources. Their isolation is critical both in fixed applications and on wheeled or container-mounted units. The 2-metal-side rails are particularly suitable for withstanding shocks and transport accelerations.

HVAC systems

In heating plants, cold rooms, and air-conditioning systems, acoustic comfort is both a regulatory and functional requirement. Sandwich mount rubber-metal rails on fan coil, chiller, and air handling unit supports help meet the sound emission limits required by regulations.

Automated production lines

In series production systems, vibrations from one machine propagate to adjacent equipment, affecting product quality and the precision of artificial vision systems. Sandwich mount rubber-metal rails create mechanical discontinuities in the line, confining vibrations to the generation area.

Metal structures and industrial carpentry

In metal structures subject to dynamic loads (bridges, industrial walkways, automated warehouse racking), sandwich mount rubber-metal rails absorb load impulses and reduce fatigue in welded joints.

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Materials and technical specifications

Elastomeric rubber

The rubber used in standard sandwich mount rubber-metal rails is an elastomeric compound based on NR (natural rubber) or NBR (acrylonitrile-butadiene), selected according to the application field:

• Shore A hardness: standard rails are typically available with hardness between 50 and 70 Shore A. Lower values (45–55 Shore) provide greater damping but lower static load capacity; higher values (65–75 Shore) are preferable for high loads with moderate damping.
• Dynamic behavior: the ratio between dynamic and static stiffness (Kdyn/Kstat) is a critical parameter for isolation design. In standard compounds this ratio is generally between 1.2 and 1.5.
• Resistance to chemical agents: NBR compounds offer good resistance to mineral oils, hydrocarbons, and hydraulic fluids, making them suitable for typical industrial environments.
• Operating temperature range: from –30°C to +80°C for standard compounds, with allowable peaks up to +100°C.

Metal insert

The metal insert(s) of the sandwich mount rubber-metal rails are made of galvanized steel (electrolytic or hot-dip galvanizing), which guarantees:

• Adequate corrosion resistance in humid industrial environments or with mild chemical agents
• High structural rigidity for bolted fixing
• Good weldability if structural integrations are required

Mechanical properties

Property	Typical value
Shore A hardness	50 – 70 Shore
Allowable static load	depends on section and length
Operating temperature	–30°C / +80°C
Resistance to mineral oils (NBR)	Good
Insert material	Galvanized steel

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Available dimensions

Larosi sandwich mount rubber-metal rails are available in a range of standard lengths and sections that cover the most common needs of the industrial market. The most common cross-sections range from compact profiles for light applications to more robust sections for heavy industrial use.

B * H * L	B	H	S=5	S=10	S=15
20 * 30 * 2000	20	30	●	○	○
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200 * 100 * 2000	200	100	○	●	●

For specific non-standard length or section requirements, Larosi offers the possibility of custom supply or cut-to-size from standard stock rails, reducing lead times compared to full custom production.

Available in different sizes on request — contact us to specify your technical requirements and receive the best solution quickly.

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Advantages of Larosi sandwich mount rubber-metal rails

Wide stock availability

Larosi maintains significant inventory of the most requested references, eliminating the typical downtime of suppliers who work only on order. For resellers, this means being able to respond to customers with guaranteed availability.

Fast delivery throughout Europe

Sandwich mount rubber-metal rails are shipped with selected carriers for reliability and speed. Logistics is one of the cornerstones of Larosi’s service: delivery speed is a real competitive advantage, not just an advertising claim.

B2B technical support

The Larosi technical team is available to support correct component selection based on the application, avoiding specification errors and returns. For resellers, this translates into fewer post-sales issues and more satisfied customers.

Range compatible with cross-industry applications

With over 1,000,000 items in the catalog, Larosi can supply sandwich mount rubber-metal rails together with all the other components needed for the installation: O-rings, gaskets, joints, adjustable feet, air springs, and semi-finished technopolymer products. A single supplier for multiple product families means consolidated orders, less administration, and better logistics conditions.

Structured and reliable B2B supply

Founded in 1970 in Padua, Larosi Srl has built, over more than fifty years, a reputation based on commercial reliability, efficient warehouse management, and the ability to find or manufacture what the market demands. Resellers who rely on Larosi find a partner that never disappoints on deliveries.

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FAQ — Frequently asked questions about sandwich mount rubber-metal rails