Product Overview

The NF E 25-511 conical anti-loosening washer is manufactured to the French standard NF E 25-511 from special spring steel with heat treatment. The conical body provides lasting preload compensation, while interlocking radial serrations on the faces bite deep into the joint surfaces once tightened, maintaining clamp load even under heavy vibration and high alternating loads.

Technical Features

• Made to the French standard NF E 25-511, with documented geometry and material properties.
• Conical structure continuously compensates preload loss
• Radial serrations bite into the joint face to resist lateral slippage.
• Heat-treated special spring steel keeps hardness and elasticity over time.
• Does not damage the main structure and can be reused

Technical Specifications

Applications

• Rail transit and vehicle chassis
• Construction machinery and mining equipment
• Wind power and heavy steel structures
• Stamping and forging equipment