Flat Washer HDG

Product Introduction

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

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

• Product Definition: A standard flat washer treated with a hot-dip galvanizing process. Its base material is immersed in molten zinc to form a robust zinc-iron alloy coating. This coating provides significantly longer-lasting corrosion protection than ordinary electrogalvanizing (lasting decades in certain environments), making it particularly suitable for outdoor, humid, or corrosive industrial settings.

Flat Washer HDG Key Features

• 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.

• Flat Ring Design: Circular flat plate structure, inner hole matches bolt diameter, larger outer diameter

  provides a uniform bearing surface, preventing material embedding in the nut/head.

• Material and Strength: Commonly used carbon steel, standard thickness; conforms to DIN 125,

  ASME B18.22.1, or F436 structural standards.

• Various Sizes: Inner diameter M6-M48 (or 1/4"-2"), various outer diameters and thicknesses

  (such as USS/SAE or structural types).

• Advantages: High weather resistance, uniform load distribution, economical and durable, commonly

  used in heavy-duty structures.

Working Principle

• Placement: Placed below the nut/bolt head to increase the contact area.

• Pressure Distribution: Evenly distributes clamping force when torque is applied, preventing material

  deformation or nut embedding.

• Corrosion Protection Mechanism: Zinc acts as a sacrificial anode, preferentially oxidizing and protecting

  the substrate; thick-layer self-healing minimizes damage.

• Auxiliary Anti-Loosening: Enhances stability when used in conjunction with spring washers;

  the principle involves area enlargement and electrochemical protection.

Product Applications

• Steel Structure Engineering: Used with galvanized bolts to secure beams and columns in bridges,

  factories, or high-rise buildings, evenly distributing the load.

• Infrastructure: Used for power towers, highway guardrails, or pipeline systems to resist atmospheric

  corrosion.

• 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 panel supports, providing long-term stability.