Durlok
Durlok Fasteners are high-performance self-locking bolts and nuts designed to resist loosening under severe vibration and shock. Featuring serrated teeth on the flange that grip surfaces gently but firmly, they eliminate the need for washers and provide reliable, reusable locking in critical applications.
| Parameter | Specification |
|---|---|
Product Type |
Durlok Self-Locking Bolt & Nut System |
Size Range |
M6 – M20 |
Material Options |
Alloy Steel (Class 12.9 Bolts; Class 12 Nuts) |
Standards |
Unbrako Specification, ISO, DIN |
Surface Finish |
Black Oxide, Zinc Plated |
Industrial Applications
Durlok Fasteners are widely used in:
- Automotive industry: Secure critical fastenings in engines, chassis, and suspension systems exposed to vibration.
- Aerospace and defense: Provide self-locking assurance in high-stress, vibration-prone structural assemblies.
- Railways and heavy machinery: Ensure fastener integrity during constant dynamic loading and shock.
- Construction and infrastructure: Used in demanding environments requiring high-strength and vibration-resistant fastening.
- Power generation and petrochemical plants: Maintain secure joints in critical piping and machinery under heavy vibration.
Product Description
The Durlok System comprises specially designed bolts and nuts with radial serrations on the flange surface that engage both the fastener and the bearing material. This design produces moderate but sufficient edge pressure to guarantee self-locking without damaging or grooving the clamped material. Durlok fasteners are reusable, as their serration pattern maintains locking ability even after multiple assemblies. The system works effectively on a broad range of materials including hardened steels, cast irons, non-ferrous metals, and sheet materials. Designed for high tensile strength and vibration resistance, Durlok fasteners deliver enhanced safety, reduced maintenance, and improved performance in critical engineering applications.
Product specifications
- Bolt Material & Grade: Alloy steel, Class 12.9, minimum tensile strength 1220 N/mm²
- Nut Material & Grade: Alloy steel, Class 12, hardness HRC 28–36
- Washer Material & Grade: Hardened steel, hardness HRC 47–52
- Size Range: Metric M6 to M20
- Thread Type: ISO metric standard
- Surface Finish: Black oxide, zinc plated
- Tensile Strength: High tensile class 12.9 bolts meet or exceed ISO 898-1 standards
- Self-Locking Feature: Serrated flange teeth create anti-vibration locking without washers
- Reusability: Maintains locking effectiveness after multiple uses
- Operating Temperature: Suitable for typical industrial temperature ranges
- Standards/Compliance: Conforms to Unbrako, ISO, and DIN specifications
- Corrosion Resistance: Enhanced by coatings; stainless variants available on request
- Advantages: Eliminates need for separate washers, provides vibration resistance, reduces maintenance costs
Related Products
Crimping Nut
Grease Nipple
Inch Thread and Metric Thread
