How the Fastening Industry Utilizes Rubber Washers & Seals

Conventional fasteners—which include bolts, rivets, nuts, and screws— can efficiently mount a number of items to surfaces or surfaces to each other. In certain industrial applications, however, regular fastening isn’t enough to prevent unwanted and unintentional flow of potentially damaging gases and liquids.

When used in conjunction or fused with a rubber product like a rubber washer or rubber gasket, fasteners form a much more effective seal against all kinds of external contaminants.

Rubber Products and Their Benefits

At Thomas A. Caserta, we provide high-quality rubber hardware for a broad spectrum of fastening applications. Available in a variety of designs and configurations, rubber fastener components work well in conjunction with metal fasteners to create reliable, durable seals. The most popular rubber fasteners include washers, spacers, gaskets, and bushings.

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Rubber washers are round, flat discs with a hole in the middle, which allows fastening components such as washer screws to pass through the center. Manufacturers use screws with rubber washers distribute the force of the screw head, which keeps the screw head from digging into surfaces and creating damage. They can also be used to dampen vibrations and prevent air or fluid leaks around the fastener. Rubber washers for screws come in a wide range of materials, thicknesses, and diameters to meet the needs of particular applications.


Spacers are also round rubber discs with holes, similar to washers, although they are often thicker. Spacers are designed to separate two parts or objects by a specific distance. Rubber spacers for bolts are especially useful for securing fasteners in high-vibration applications because the rubber will absorb the vibration to keep the fastener from loosening unexpectedly.


Gaskets are available in a variety of shapes and thicknesses and are often used with metal screws to create a tight seal between two parts. Rubber gasket screws are metal screws that come with the rubber gasket already affixed, allowing users to easily fasten components together while establishing a physical barrier against the intrusion of air, fluids, particulate matter, and electromagnetic interference. They also help to keep parts from creeping or extruding in extreme operating conditions.


Industrial rubber bushings isolate vibration between components to minimize wear. The rubber bushing absorbs the vibration energy produced by the interaction of the attached components, ensuring smoother operation and reduced friction between components.

Benefits of Using Rubber Components in the Fastening Industry

Rubber components offer a variety of benefits over more traditional metal fasteners. Some of the primary advantages of using rubber hardware include:

  • Added flexibility. Rubber is more flexible than traditional metal components, which provides a more secure fit with less potential for leakage and creep.
  • Broader load distribution. Rubber washers help to distribute pressure from fastener loads, which reduces the potential for damage to surrounding surfaces.
  • Reliable and accurate spacing. Rubber washers and spacers help to establish a reliable amount of space between components, ensuring optimal operation and preventing unwanted contact between components.
  • Vibration absorption. Rubber hardware helps to absorb vibration, reducing the potential for wear, creep, and displacement.
  • Sealing protection. Flexible rubber gaskets seal components to prevent fluid and other substances from leaking. They are available in a variety of materials that can withstand corrosive chemicals, extreme temperatures, and other harsh operating conditions.
  • Surface protection. The flexibility and load distribution properties of rubber washers help to prevent surface damage and corrosion, which helps to mitigate the risk of equipment damage, cross contamination, and inefficient processes.
  • Enhanced stability. Rubber fastening hardware can be manufactured in a variety of shapes, sizes, and configurations to ensure a stable, dependable fastening solution with a reliable seal and low creep potential.

When to Use Rubber Hardware? fastening industry

From rubber bolts and rubber washers to sealing gaskets and industrial rubber bushings, fastening hardware is critical to a wide range of industries and applications. Examples include:

  • Aircraft engines and motors (fastenings for fuel pumps, satellites, and robotic equipment)
  • Circuit boards (insulate connections, mitigate vibration)
  • Conveyor belts (seal process machinery, prevent leaks, and reduce vibration)
  • Home appliances (seal doors, prevent process fluid leaks, reduce vibration)
  • Electric-charging vehicle units (protect from fluid leaks, unwanted electrical flow)
  • HVAC systems (seal process fluids, prevent intrusion of unwanted materials into the system)
  • Medical equipment (facilitate reliable operation of medical assistive devices and equipment)
  • Sensors (keep air and fluid pressure consistent, prevent the intrusion of unwanted materials)

Custom Rubber Components from Thomas A. Caserta

Made in the USA Rubber Products

Rubber washers and gaskets are essential in the fastening industry when they are used with traditional fasteners like nuts, bolts, and screws; the rubber components provide extra sealing protection against the environment and foreign substances. This can save equipment from excessive damage and expensive repairs, maximize productivity, and minimize operational downtime.

Thomas A. Caserta, Inc. manufactures quality rubber products for diverse and demanding industries. With more than 50 years of experience, we can design our rubber products to any specification to ensure they are the right fit for your needs. We also utilize the latest equipment that produces high-quality parts at competitive prices and quick turnaround times. Regardless of how big or small your job is, we can meet your needs. Our skilled and dedicated team strives to fulfill our number one goal: customer satisfaction. Contact us to request your custom rubber product quote today!

Rubber Seals in the Automotive Industry

The automotive industry relies on an expansive range of parts and components to build the critical systems and support infrastructure that come together to make a completed automobile. These integrated systems must reliably withstand the effects of motion and vibration from driving surfaces, the engine, and other factors. Rubber seals and gaskets provide cushioning and firm seals to prevent liquids and gases from leaking. Rubber sealing solutions are found throughout vehicle systems, from the engine and transmission to the doors and windows.

Automotive rubber seals must be tear-resistant, non-flammable, flexible, durable, and able to stand up to high speeds, extreme temperatures, and intense pressure. Automotive rubber components minimize rotational or translational movements between two joined parts to prevent fluids from leaking out or gases from seeping into the passenger cabin. Using high-quality seals ensures each part operates efficiently and independently.

Different Types of Automotive Seals

Automotive gasket manufacturers produce several types of rubber seals, including:

  • Rubber washers. These flat rubber rings have an open center that allows fluid to pass through the connected parts. They provide a tight, non-abrasive seal in pipe and hose fittings to protects against leaks, vibration, and electrical charges.
  • Rubber gaskets. Gaskets are cut into various shapes and sizes from large sheets of rubber, which makes them highly customizable to meet the needs of specific fittings. They are widely used in the automotive industry to prevent leakage between connected parts due to their durability, color stability, temperature resistance, and general affordability.
  • Rubber bushings. Bushings absorb shock, minimize vibration, resist abrasion, and minimize or eliminate the need for lubrication between components. They are flexible and easy to use for parts like gear sticks, internal combustion, and suspension systems.
  • Silicone rubber tubing. Silicone tubing is a highly versatile product that resists frequent or continuous exposure to weather, UV radiation, heat, and ozone. This type of tubing sees extensive use in the automotive industry as an insulator for electrical cables and wires.

Applications of Rubber Seals in the Automotive Industry

rubber seals in car systemsAutomotive rubber products play an important role in many applications in the automotive industry. Their primary uses in mechanical equipment include filling gaps between components, minimizing damage from vibration, preventing the leakage of liquids or gases, or hindering contamination from moisture or dirt.

However, various applications require different types of protection. Now that we’ve identified the differences between the various types of automotive rubber solutions, let’s look at some applications that use them:

  • Cooling system gaskets. These gaskets seal components within the system to prevent the coolant from leaking out.
  • Differential seals and gaskets. Highly flexible differential seals and gaskets are attached to the transmission axle to protect it from dirt, grime, and other contaminants that could damage the transmission.
  • Electrical junction boxes/fuse boxes. Electrical seals stop moisture and dirt from getting into the electrical system where they could cause sparks, fires, shorts, or other malfunctions.
  • Engine seals and gaskets. These seals and gaskets absorb excess heat and compression while ensuring that oil, fluids, or coolant don’t leak into or out of the engine compartment.
  • Fuel supply gaskets. Placed in between the fuel pump mounting surface and the fuel pump space, fuel supply gaskets maintain pressure within the engine compartment.
  • Transmission seals. Transmission seals and gaskets are used in internal and external transmission components to create pressure-tight connections in accumulators, servos, clutch packs, and transmission axle cases.
  • Windshields. The seals and gaskets used around windshields are an important factor in safety and comfort, maintaining air quality, cushioning the windshield against flexing movements, and protecting the occupants from wind, water, and noise.

Partnering With Caserta

Rubber Components Made in the USA

Thomas A. Caserta is a premier global supplier of high-quality rubber seals to a diverse range of demanding industries. For decades, our customers have depended on our ability to design and supply prototypes or production parts with fast turnarounds, regardless of project size. Our products come in a variety of rubber materials, such as EPDM, SBR, nitrile, neoprene, silicone, and Viton. We offer a broad portfolio of rubber seals for the highly competitive automotive industry, including:

Please contact us to see how our automotive rubber solutions can benefit your operation.