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Internal Tooth Lock Washer (DIN 6798J)

The Internal Tooth Lock Washer features serrations on the inner edge that bite into the surface of the workpiece or nut when tightened. This design increases friction and effectively prevents loosening caused by vibration or load variation. Compared to external tooth washers, the internal type is more suitable for limited space applications or when a smooth outer appearance is required.

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Available in two types: Standard Type (AW) and Heavy Duty Type (IOW).

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Size & Material​​

  • Sizes: Compliant with DIN 6798J standard

  • Types:

    • Standard Type: AW

    • Heavy Duty Type: IOW

  • Materials:

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

    • Stainless Steel SUS304 (A2-70)

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Features

  • Manufactured according to DIN 6798J with Standard (AW) and Heavy Duty (IOW) options.

  • Internal serrations bite into the surface, preventing rotation and enhancing anti-loosening performance.

  • AW: Suitable for small screws, electronics, and light-duty applications.

  • IOW: Deeper serrations for stronger grip, ideal for high-vibration or heavy-load environments.

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

  • Smooth outer diameter after installation, ideal for assemblies requiring a neat appearance.

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Applications

  • Electronic devices and small motors (AW)

  • Light machinery and automation assembly (AW)

  • Automotive parts and heavy vibration environments (IOW)

  • Precision instruments and medical equipment

  • Construction and steel structures

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