Disc Spring Washers vs Disc Washers: DIN 6796 High Load Locking Washers for High-Strength Bolted Connections

Disc Spring Washers vs Disc Washers: Design Principles and Industrial Locking Solutions

Disc spring washers and disc washers are tapered elastic fasteners designed to carry axial loads and improve the reliability of bolted connections. Typically manufactured from high-strength spring steel, these washers provide high load capacity, long fatigue life, and excellent vibration resistance.

Although disc spring washers and disc washers appear similar in structure, they serve different mechanical functions and operate under different working conditions. Understanding their differences is critical when designing high-strength bolted joints in heavy industrial equipment.

In modern engineering systems, both components play an important role in bolt preload control, vibration resistance, and structural safety.

Disc Spring Washer vs Disc Washer: Understanding the Difference

Disc spring washers are often confused with disc washers, but they are governed by different engineering standards and used for different purposes.

Disc Spring Washer (DIN 2093)

Disc spring washers, also known as Belleville washers, are standardized under DIN 2093. They function as mechanical springs, designed to generate controlled elastic force under axial compression.

Their primary functions include:

• Maintaining bolt preload

• Absorbing vibration and shock

• Compensating for thermal expansion

• Providing controlled spring force

Disc springs are commonly used in precision mechanical assemblies, heavy machinery, and preload systems.

Disc Washer (DIN 6796)

Disc washers standardized under DIN 6796 are often mistaken for disc springs, but they are actually locking washers designed specifically for high-strength bolted connections.

DIN 6796 washers are conical elastic washers installed under bolt heads or nuts to improve the clamping reliability of bolted joints.

When compressed during installation, the washer flattens and generates a reaction force of approximately 70–90% of the bolt preload.

Because of this characteristic, DIN 6796 washers are particularly suitable for:

• High-strength bolts (8.8 – 12.9 grade)

• Heavy mechanical equipment

• Structural steel assemblies

• Machinery subject to vibration

In high-load mechanical systems, they are considered an ideal solution for improving bolt connection reliability.

Advantages of Disc Washers in Industrial Applications

Disc washers provide several important performance advantages in bolted joint design.

High Axial Load Capacity

Due to their conical geometry, disc washers can support large axial forces within a compact installation space.

Excellent Anti-Loosening Performance

The elastic force generated during compression maintains continuous bolt tension, preventing loosening caused by vibration or dynamic loads.

Compensation for Load Loss

Disc washers help compensate for load relaxation caused by temperature changes, material creep, or surface wear.

Long Service Life

High-quality disc washers made from spring steel offer excellent fatigue resistance and long operational life, even under cyclic loads.

Uniform Load Distribution

The design ensures even load concentration across the contact surface, improving joint stability and reducing component damage.

Industrial Applications of Disc Washers

Due to their high reliability and anti-loosening capability, disc washers are widely used in many industries.

Typical application sectors include:

• Automotive manufacturing

• Electric power equipment

• Heavy construction machinery

• Machine tools

• Aerospace engineering

• Defense systems

• Medical equipment

• Railway transportation systems

In many cases, disc washers are used as an alternative to traditional spring washers, offering improved performance in demanding industrial environments.

Types of Disc Washer Industrial Solutions

Disc washers can be categorized into several types based on torque capacity and application requirements.

DIN 6796 Disc Lock Washers (HDS Series)

The DIN 6796 (HDS series) disc washer is specifically designed to prevent loosening of bolted joints.

After installation in a bolted connection, these washers help compensate for:

• Bolt tension relaxation

• Wear of contacting surfaces

• Thermal expansion and contraction

• Gasket compression

The HDS series significantly increases the elasticity of bolted joints, making them an effective replacement for traditional spring washers.

However, they are typically used independently rather than combined with flat washers or lock washers.

High-Torque Disc Spring Washers

High-torque disc washers are designed for high-load and high-vibration applications.

Typical characteristics include:

• Operating temperature range: -200°C to 300°C

• Higher elastic tension force

• Excellent anti-loosening capability

These washers are widely used in high-speed railway systems, heavy power equipment, and large mechanical assemblies.

Ultra-High Torque Disc Spring Washers

Ultra-high-torque disc washers are designed for extreme-temperature and heavy-load environments.

Key specifications include:

• Operating temperature range: -200°C to 600°C

• High-temperature resistant alloy materials

• Excellent preload compensation

These washers maintain stable bolt preload under severe thermal conditions, preventing:

• Bolt fatigue

• Seal failure

• Joint loosening caused by vibration

They are commonly used in energy systems, industrial furnaces, aerospace equipment, and high-temperature mechanical systems.

Disc Washer Series and Functional Types

Dishwashers can also be classified by their design and application.

Common series include:

• VS series disc spring lock washers

• S series disc spring lock washers

• Bearing preload disc washers

• Flange disc washers

• High-torque anti-loosening washers

Selecting the correct washer type requires evaluation of:

• Bolt strength grade

• Required preload force

• Vibration conditions

• Operating temperature

• Environmental corrosion factors

Conclusion

Disc spring washers and disc washers play essential roles in modern high-strength bolted joint design. While DIN 2093 disc springs function primarily as elastic spring elements, DIN 6796 disc washers are engineered specifically for anti-loosening bolt connections.

By selecting the correct washer type, engineers can significantly improve:

• Bolt preload stability

• Vibration resistance

• Structural safety

• Equipment service life

For demanding industrial environments, disc washers provide a cost-effective and highly reliable fastening solution.

If you are looking for high-quality industrial fasteners, disc spring washers, or engineering fastening solutions, please feel free to contact us.

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