External Tooth Lock Washer (DIN 6798A)

The External Tooth Lock Washer is designed with serrations on the outer edge, which embed into the surface of the workpiece when tightened. This provides extra friction and effectively prevents loosening. Compared with internal tooth washers, the external type is more suitable for applications with larger outer diameters, offering better load distribution and anti-loosening performance.

Two types are available: Standard Type (BW) and Heavy Duty Type (EOW), making it suitable for both general and high-vibration environments.

Size & Material​

• Sizes: Compliant with DIN 6798A standard

• Types:

  • Standard Type: BW

  • Heavy Duty Type: EOW

• Materials:

  • Carbon Steel (surface treatment: Zinc Plated, Black Oxide)

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Features

• Manufactured according to DIN 6798A with Standard (BW) and Heavy Duty (EOW) options.

• External serrations provide higher friction and enhanced anti-loosening ability.

• BW: Suitable for general industrial and assembly applications.

• EOW: Features deeper serrations for stronger locking effect, ideal for high-vibration or heavy-load conditions.

• Available in carbon steel and SUS304 stainless steel with optional surface treatments.

• Simple, cost-effective, and reliable anti-loosening solution.

Applications

• Electronic products and electrical components (BW)

• General machinery and automation assembly (BW)

• Automotive parts and heavy machinery with high vibration (EOW)

• Construction and steel structures (EOW)

• Semiconductor and medical equipment

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