Hot Dipped Galvanised (HDG) Coated Washers Manufacturer, Exporter & Supplier in India

About Dipti Metal Industries

Founded in 2009 by Mr. Kumpsingh Rajput, Dipti Metal Industries is a trusted Manufacturer, Exporter, Stockist, Dealer, Supplier, and Wholesaler of Hot Dipped Galvanised Washers in India. Based in Mumbai, we are globally recognized for producing premium anti-corrosion fasteners under our “Dipti” brand, exported to over 40+ countries worldwide.

What are Hot Dipped Galvanised Washers?

Hot Dipped Galvanised (HDG) washers are coated with molten zinc using the ASTM A153/A153M hot-dip process, ensuring maximum corrosion resistance and long-lasting performance. The zinc-iron alloy layers bond metallurgically with steel, forming a protective shield against rust and weather.

These washers are widely used in structural, outdoor, and marine applications where long-term durability is critical.

Standards & Specifications

• ASTM A153 / A153M – 16 – Zinc Coating on Iron and Steel Hardware

• AASHTO M232 – Transportation hardware standard

• ISO / DIN Standards – Equivalent to DIN EN ISO 1461

• ASME Standards – For structural bolting & fasteners

Coating Thickness / Weight (ASTM A153 Classes):

• Class A – Castings: 86 microns avg.

• Class B1 / B2 / B3 – Rolled, forged articles: 66–86 microns avg.

• Class C – Fasteners & Washers ≥4.76 mm: 53 microns avg.

• Class D – Washers <4.76 mm: 43 microns avg.

Types of Hot Dipped Galvanised Washers

• Flat Washers – Standard & heavy-duty

• Spring Washers – Split lock, conical, Belleville

• Square Washers – Structural & anchor types

• Fender Washers – Large OD applications

• Tab Washers – Locking type

• Custom HDG Washers – As per drawings & requirements

Materials & Grades Available

• Carbon Steel HDG Washers – ASTM A36, A283, A307

• Alloy Steel HDG Washers – ASTM A194, ASTM A320

Key Features

✔ Superior corrosion resistance in marine & industrial environments
✔ Longer service life than electro-galvanised or zinc-plated washers
✔ Strong metallurgical zinc bond with steel surface
✔ Uniform coating with minimal bare spots
✔ Tested for coating thickness, adherence & embrittlement resistance

Applications of HDG Washers

• Bridges, Railways, Highways, and Dams

• Offshore Platforms & Refineries

• Shipbuilding, Ports & Coastal Installations

• Wind Turbines & Solar Energy Structures

• Transmission Towers & Substations

• Heavy Industrial & Mining Installations

Quality Assurance

• Coating Thickness Test – ASTM A90 / A90M

• Adherence Test – Knife Test (ASTM A153)

• Embrittlement Prevention – ASTM A143 practices

• Dimensional Testing & PMI Verification

• Export Packaging – Seaworthy wooden crates, cartons & pallets

Why Choose Dipti Metal Industries?

• 🌍 Exporting to USA, Europe, Middle East, Africa & Asia-Pacific

• 🏭 In-house production with ASTM & ISO compliance

• ✅ Mill Test Certified (EN 10204 3.1 / 3.2)

• ⚡ Large ready stock, cut-to-size, and quick dispatch

• 💲 Competitive pricing trusted by EPCs & OEMs globally

Frequently Asked Questions (FAQ)

Q1: What is the coating thickness for HDG washers?
✔ ASTM A153 specifies 43–86 microns depending on class and size.

Q2: How are HDG washers better than zinc plated washers?
✔ HDG coating is much thicker, more durable, and withstands harsh outdoor conditions.

Q3: Are Dipti’s HDG washers export certified?
✔ Yes, we provide Mill Test Certificates (EN 10204) and comply with ASTM, ISO, DIN, and ASME standards.

Partner with Dipti Metal Industries

For Hot Dipped Galvanised Coated Washers, trust Dipti Metal Industries – a leading Manufacturer, Exporter, Stockist, Dealer, Supplier & Wholesaler in India since 2009.

📞 Contact us today for quotations, technical support, and reliable global delivery.