Hot Dip Galvanization(HDG)

Hot Dip Galvanized Fasteners Manufacturer in India

BRK Industries is a trusted Hot Dip Galvanized (HDG) Fasteners Manufacturer and Exporter in India, offering premium-quality bolts, nuts, washers, threaded rods, U-bolts and structural fasteners designed for long-term corrosion protection. Our HDG coating process creates a thick metallurgically bonded zinc layer that protects steel fasteners even in harsh outdoor, industrial and marine environments. Unlike paint or electroplating, the zinc coating becomes part of the steel surface, providing both barrier and sacrificial protection against rust.

Whether your project involves bridges, transmission towers, solar mounting structures, highways or heavy engineering, our HDG fasteners deliver exceptional durability with minimal maintenance.

What is Hot Dip Galvanizing?

Hot Dip Galvanizing is a surface treatment process in which steel fasteners are immersed in molten zinc at approximately 450°C (842°F). During immersion, zinc reacts with the steel to form multiple zinc-iron alloy layers topped by a pure zinc outer layer. This metallurgical bond makes HDG significantly more durable than ordinary zinc plating.

Why Hot Dip Galvanized is Different

Feature	Hot Dip Galvanized	Electro Zinc Plated
Coating Thickness	Thick	Thin
Corrosion Protection	Excellent	Moderate
Outdoor Performance	Outstanding	Limited
Marine Use	Yes	Not Recommended
Coating Bond	Metallurgical	Surface Deposit

HDG coatings also provide cathodic (sacrificial) protection, meaning nearby zinc corrodes first if the coating is scratched, helping protect the underlying steel.

Hot Dip Galvanizing Process for Fasteners

Our fasteners undergo a carefully controlled galvanizing process to ensure consistent coating thickness and reliable performance.

1 Surface Cleaning

Fasteners are cleaned using alkaline solutions to remove oils, grease and contaminants. A clean surface is essential for proper zinc bonding.

2 Pickling

The fasteners are treated in an acid bath to remove rust, mill scale and oxidation from the steel surface.

3

Rinsing

The components are thoroughly rinsed to eliminate residual chemicals before the next stage.

4

Flux Treatment

A zinc-ammonium chloride flux is applied to prevent oxidation before galvanizing and improve zinc adhesion.

5

Molten Zinc Immersion

The fasteners are immersed in molten zinc at approximately 450°C, where zinc and steel react to form durable alloy layers.

6

Spin Galvanizing

Smaller fasteners are centrifuged immediately after dipping to remove excess zinc and maitain proper thread fit.

7

Cooling & Inspection

Every batch undergoes visual inspection, coating thickness verification and quality checks before dispatch.

Zinc Coating Structure

The HDG coating consists of multiple protective layers:

Layer	Purpose
Eta Layer	Pure zinc outer protection
Zeta Layer	Zinc-Iron alloy
Delta Layer	Dense protective alloy
Gamma Layer	Strong metallurgical bond
Steel Base	Structural strength

Benefits of Hot Dip Galvanized Fasteners

Superior Corrosion Protection

Thick zinc coating protects steel in humid, industrial and coastal environments.

Complete Surface Coverage

Molten zinc coats corners, edges and threads more uniformly than many alternative coatings.

Sacrificial Protection

Zinc corrodes before steel, helping protect scratched or exposed areas.

High Durability

Alloy layers resist abrasion during handling, transportation and installation.

Long Service Life

Designed for decades of reliable outdoor performance with minimal maintenance.

Wide Temperature Performance

Suitable across a broad operating temperature range in many industrial environments.

Products Range

We manufacture and supply:

Available Standards

Material Grades

Technical Specifications

Parameter	Specification
Coating Process	Hot Dip Galvanizing
Zinc Bath Temperature	Approx. 450°C
Protection Type	Barrier + Sacrificial
Finish	Matte Grey
Standards	ASTM F2329, ASTM A153, ISO Guidelines
Suitable Environment	Outdoor & Industrial

Important Note: Threaded HDG fasteners often require properly matched galvanized nuts because the zinc coating increases thread thickness. Oversized tapped nuts are commonly used for proper assembly.

Why Choose BRK Industries?

Applications of HDG Fasteners

Hot Dip Galvanized Fasteners are widely used in industries where corrosion resistance is critical.

Infrastructure

Bridges
Flyovers
Highway Guard Rails
Metro Projects

Power & Energy

Transmission Towers
Solar Mounting Structures
Wind Turbines
Power Plants

Construction

Structural Steel Buildings
Industrial Sheds
Warehouses
Steel Fabrication

Marine & Coastal

Ports
Docks
Offshore Structures
Coastal Installations

Agriculture

Irrigation Systems
Farm Structures
Storage Facilities

Frequently Asked Questions

1. What is Hot Dip Galvanizing?

Hot Dip Galvanizing is a process where steel fasteners are immersed in molten zinc at around 450°C to create a durable corrosion-resistant coating.

2. How long do Hot Dip Galvanized fasteners last?

Service life depends on the environment, but HDG coatings are designed for long-term outdoor protection with minimal maintenance.

3. Are Hot Dip Galvanized fasteners suitable for marine applications?

Yes, they are widely used in coastal and marine environments because zinc provides sacrificial corrosion protection.

4. What standards apply to Hot Dip Galvanized fasteners?

Common standards include ASTM F2329 and ASTM A153 for hot-dip galvanized fasteners.

5. Can Hot Dip Galvanized fasteners be painted?

Yes, they can be painted to create a duplex coating system for additional protection.

6. What is the difference between Hot Dip Galvanized and zinc plating?

HDG provides a thicker metallurgically bonded coating suitable for outdoor applications, while zinc plating produces a thinner decorative coating.

BRK INDUSTRIES