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Locking Disc Spring Washer M | Spring Steel Hardened | Zinc-Flake Coated | @Pack of 25 | by Wurth
Locking Disc Spring Washer M is designed for M20 screw threads, featuring a spring steel construction and a zinc-flake coating for enhanced corrosion resistance. Ideal for mechanical fastening applications, it provides secure locking and protects counter surfaces from damage. With a high-temperature tolerance of up to 350°C, this reusable washer ensures reliability in demanding environments.
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Product Name/Title: Locking Disc Spring Washer M | Spring Steel Hardened | Zinc-Flake Coated | @Pack of 25 | by Wurth
Brand: Wurth
SKU: 40120
Alternatively Known As: Lock washer M20, Spring lock washer, Serrated lock washer, Disc spring washer, Zinc-flake coated washer
Technical Specifications
- Suitable for screw thread: M20
- Internal diameter (d1): 21 mm
- Outer diameter (d2): 40 mm
- Height (h1): 4.3 mm
- Thickness (s1): 3 mm
- Material: Spring steel
- Vickers hardness: 420-510 HV10
- Surface finish: Zinc-flake silver coating
- Corrosion protection period: 720 hours
- Locking device operating principle: Serrated lock washer
- Locking function: Embedding locking device
- RoHS-compliant: Yes
- Application temperature range: up to approx. 350°C
- Reusable: Yes
- Dimensions (H x L x W): 4.3mm x 40mm x 40mm
- Weight: 0.05 kg
Key Features
- Type M (medium) locking disc spring washer
- Friction locking via spring force and mechanical interlock by specific surface stamping
- Protects counter surface from damage by preventing washer rotation during installation
- Minimal tightening torque distribution
- Reusable and suitable for high temperature applications up to approx. 350°C
- Corrosion protection with zinc-flake silver coating providing 720 hours protection
- Twice as secure locking: spring-secured friction fit and positive locking
Professional Installation Requirements
- Installation by a qualified technician or professional is recommended to ensure proper torque and locking function.
Applications
- Suitable for screw connections of strength class 8.8 with normal head contact
- Ideal for mechanical fastening requiring secure locking and protection of counter surfaces
- Reusable locking washer for medium strength screw connections up to approx. 350°C
Standards & Compliance
- Complies with AS/NZS 4801 – Occupational Health & Safety Management Systems
Environmental Benefits
- Reusable design reduces waste and replacement frequency
- RoHS-compliant materials ensure reduced hazardous substances
- Corrosion-resistant coating extends product life, reducing environmental impact
Warranty Information
Standard manufacturer warranty applies. Please refer to Wurth warranty policy for details.
Available Now
The Wurth Locking Disc Spring Washer M20 is available for immediate purchase, ideal for industrial and mechanical fastening applications requiring secure locking and surface protection.
