Spring Washer HDG

Product Introduction

• Standard Name: Spring Lock Washer (Hot-Dip Galvanized).

• Common Names: Hot-Dip Galvanized Spring Washer, Hot-Dip Galvanized Lock Washer, HDG Spring Washer.

• Product Definition: A single-coil spiral lock washer manufactured from spring steel with a hot-dip galvanized (HDG) surface treatment. It provides sustained preload through elastic deformation to prevent connection loosening, while its substantial hot-dip zinc coating delivers superior corrosion resistance far exceeding standard electroplating. Particularly suitable for outdoor, humid, or corrosive industrial environments.

Key Features of Spring Washer HDG

• Hot-Dip Galvanized (HDG) Coating: Provides a thick zinc layer (typically 50-100μm), forming a

  metallurgical bond, excellent corrosion resistance, suitable for outdoor or humid environments,

  matte silver-gray surface, and a rough texture to enhance adhesion.

• Split Spring Design: A ring-shaped split structure generates elastic restoring force upon compression,

  providing continuous axial pressure and resisting vibration-induced loosening.

• Materials and Strength: Commonly used carbon steel or alloy steel, high elasticity; conforms to standards

  such as DIN 127 and ASME B18.21.1.

• Various specifications: Inner diameter M3-M48 (or #4-2"), standard thickness, commonly used for

  bolt/nut fittings.

• Advantages: Reliable anti-loosening, strong weather resistance, economical and durable, suitable for

  harsh conditions.

Working Principle

• Compression Installation: Placed under the nut, the washer is compressed upon tightening, causing

  elastic deformation at the split end.

• Restoring Force Generation: The elastic restoring force provides continuous spring force, maintaining

  the clamping force.

• Vibration Resistance: Under vibration, the restoring force prevents the nut from rotating backward;

  the zinc layer acts as a sacrificial anode, preferentially oxidizing and protecting the substrate.

• Load Distribution: Evenly transmits pressure, preventing loosening; the principle involves elastic

  deformation, frictional grip, and electrochemical protection.

Product Applications

• Steel Structure Engineering: Secures beams and columns of bridges, factories, or high-rise buildings,

  resisting vibration and atmospheric corrosion.

• Infrastructure: Used for power towers, highway guardrails, or pipeline systems, providing long-term

  anti-loosening.

• Marine and Outdoor: Connects dock equipment or fencing, resistant to salt spray and moisture.

• Industrial Equipment: Assembles heavy machinery or warehouse structures, economically suitable for

  harsh conditions.

• Energy Sector: Wind turbine towers or solar panels, ensuring stability.