Metric High-Pressure Metal-Bonded Sealing Washers: Types, Applications & Installation Guide

What Are Metal-Bonded Sealing Washers?

Metric high-pressure metal-bonded sealing washers (also known as bonded seals or Dowty seals) are advanced sealing components designed for threaded connections and flange systems.

They consist of:

• A metal outer ring (typically carbon steel or stainless steel)

• An elastomer inner ring (commonly NBR or FKM/Viton)

These two components are permanently bonded through vulcanization, forming a highly reliable sealing unit capable of withstanding high pressure, temperature variations, and exposure to fluids.

Structure and Working Principle

The design of metal-bonded sealing washers ensures optimal sealing performance:

• The metal ring provides mechanical strength and prevents over-compression

• The rubber sealing lip deforms under pressure to create a tight seal

• The controlled compression ensures consistent sealing without damage

This structure effectively eliminates leakage caused by:

• Excess torque

• Uneven surfaces

• Pressure fluctuations

Types of Combination Sealing Washers

Combination sealing washers are classified based on materials and structure:

1. Based on Material Composition

• Metal + NBR (oil-resistant applications)

• Metal + FKM/Viton (high temperature & chemical resistance)

• PTFE + Rubber combinations

• Fiber and composite sealing washers

2. Based on Structural Design

• Type A: Standard bonded sealing washer

• Type B: Reinforced or special-profile design

• Full rubber coverage

• Partial (half) rubber bonding

Each type is selected depending on pressure level, sealing surface, and application environment.

Common Types of Sealing Washers

• High-pressure metal-bonded sealing washers

• Metric bonded sealing washers

• Hydraulic sealing washers

• Weather-resistant rubber sealing washers

• Oil-resistant sealing washers

• Abrasion-resistant composite washers

• Metal sealing washers for enclosures

• Sanitary sealing washers

Applications of Metric High-Pressure Sealing Washers

1. Hydraulic Systems

Widely used in:

• Hydraulic valves

• Pipe fittings

• Threaded connectors

They ensure leak-proof sealing in high-pressure fluid systems.

2. Automotive Industry

Applied in:

• Engines

• Transmissions

• Fuel systems

• Brake and hydraulic systems

They provide:

• Oil resistance

• Wear resistance

• Noise reduction

3. Machinery & Industrial Equipment

Used in:

• Machine tools

• Oil sealing systems

• Water sealing systems

They ensure:

• Stable operation

• Reduced maintenance

• Extended equipment lifespan

4. Chemical & Aerospace Applications

Due to their resistance to:

• Chemicals

• Temperature extremes

• Corrosion

They are suitable for demanding environments in:

• Chemical processing plants

• Aerospace systems

Key Advantages

• Excellent sealing performance under high pressure

• Prevention of fluid leakage (oil, fuel, water, chemicals)

• Controlled compression prevents seal damage

• Long service life and durability

• Cost-effective and easy to install

• Compatibility with metric and imperial thread systems

Installation Guidelines

Proper installation is critical for sealing effectiveness:

1. Avoid Forced Installation

• Do not apply excessive force

• Ensure proper fit into grooves or seating surfaces

2. Ensure Alignment and Balance

• Install seals evenly and symmetrically

• Maintain parallel contact with sealing surfaces

3. Protect the Sealing Surface

• Avoid scratches, deformation, or contamination

• Handle rubber elements carefully

4. Inspect Before and After Installation

• Check for damage or defects

• Reinstall immediately if leakage is detected

Important Usage Considerations

• Always select the correct size and specification

• Replace worn or aged rubber components regularly

• Avoid mixing incompatible materials

• Ensure compatibility with:

• Temperature

• Pressure

• Fluid media

Failure to follow these guidelines may lead to:

• Leakage

• System failure

• Increased maintenance costs

Future Development Trends

With advancements in materials science and industrial requirements, metal-bonded sealing washers are evolving toward:

• High-performance materials (e.g.,  advanced elastomers, nano-materials)

• Environmentally friendly production

• Smart sealing technologies for monitoring and diagnostics

These innovations will further enhance sealing reliability and sustainability across industries.

Contact Us

If you are looking for high-quality metal-bonded sealing washers, hydraulic seals, or custom fastening solutions, feel free to contact us:

Email: adelajonly@gmail.com
Website: https://www.juxinfasteners.com

We provide OEM manufacturing, engineering support, and global supply solutions for industrial applications.