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Double Layer Washer

Wedge Lock Washer / Double Layer Washer

(DIN 25201)

The wedge lock washer (also known as a double layer washer) consists of two washers with radial serrations on their inner surfaces. This unique design creates a wedge effect when the bolt or nut is tightened, generating a strong counter-friction force. As a result, it effectively prevents loosening caused by vibration or dynamic loads.

Widely used in high-vibration and heavy-duty applications, wedge lock washers provide a reliable anti-loosening solution for critical mechanical assemblies.

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Size & Material​

Size: Standard / Heavy Duty​​

Maerials:​

  • Carbon Steel (Surface: Dacromet Coating)

  • Stainless Steel SUS304 (A2-70)

  • Stainless Steel SUS316 (A4-70)

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Features

  • Manufactured in accordance with DIN 25201 anti-loosening standard, ensuring excellent resistance against vibration-induced loosening.

  • Serrated design creates strong interlocking friction, keeping fasteners securely tightened.

  • Carbon steel with Dacromet coating provides enhanced corrosion and wear resistance.

  • SUS304 / SUS316 stainless steel options available for high corrosion resistance, suitable for humid, outdoor, and marine applications.

  • Available in Standard and Heavy Duty sizes to meet different installation and load requirements.

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Applications

  • Automotive components and heavy machinery

  • Railway and bridge structures subject to high vibration

  • Industrial equipment and machine tools

  • Semiconductor, automation, and medical devices

  • Offshore engineering and outdoor installations requiring anti-loosening solutions

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