Geomet 321-500 Coated Fasteners

Geomet 321 Coated Fasteners Manufacturer in India

GEOMET® 321 is a non-electrolytic (water based) coating formed by thin-film of Zinc & Aluminum flakes to prevent corrosion on Fasteners. It doesn’t have chromium (No Cr6 neither Cr3) making it ROHS compliant and fulfills the requirements of EU Directives 2000/53/CE and 2002/95/CE alternative to DACROMET Coating.

No hydrogen embrittlement in Geomet Coating thus Prevent cracking of metals.

GEOMET® 500 is a self-lubricated basecoat, which allows obtaining a stable and controlled friction coefficient in the range of 0.12-0.18.

GEOMET® 321 and 500 coatings are versatile and effective solutions for corrosion protection on Automobile Fasteners, Wind Turbine Bolts and other High Corroion metallic bolts Application, offering a combination of corrosion resistance, lubricity, and other desirable properties.

What is Geomet 321 Coating?

Geomet 321 is a water-based zinc-aluminum flake coating that forms a thin yet highly durable protective layer on steel fasteners. The coating is applied through a non-electrolytic dip-spin or spray process and cured at controlled temperatures to achieve excellent corrosion resistance while maintaining precise thread dimensions.

Unlike coatings containing hexavalent chromium, Geomet 321 is designed as a chromium-free solution, making it suitable for environmentally conscious manufacturing.

Why Choose Geomet 321 Fasteners?

Chromium-Free Protection
Outstanding Corrosion Resistance
No Hydrogen Embrittlement
Excellent Thread Accuracy
Heat Resistant Performance
Environmentally Friendly Coating

Geomet 321 Coating Process for Fasteners

Every Geomet-coated fastener undergoes a carefully controlled coating process to ensure consistent quality and long-lasting protection.

1 Surface Preparation

Fasteners are cleaned to remove grease, oil and manufacturing residues.

2 Surface Conditioning

The steel surface is prepared to achieve strong coating adhesion.

3

Geomet Coating Application

The zinc-aluminum flake coating is applied using a dip-spin or spray process, providing uniform coverage across threads and complex shapes.

4

Excess Coating Removal

Small fasteners are centrifuged to remove excess coating while maintaining thread precision.

5

Thermal Curing

The coated fasteners are baked at controlled temperatures to create a durable protective film.

6

Quality Inspection

Every batch is inspected for coating consistency, thread compatibility and surface finish before dispatch

Geomet 321 vs Dacromet 320

Feature	Geomet 321	Dacromet 320
Chromium-Free	Yes	Limited Legacy Variants
Coating Type	Water-Based Zinc-Aluminum Flake	Zinc-Aluminum Flake
Hydrogen Embrittlement	No	No
Corrosion Resistance	Excellent	Excellent
Thread Accuracy	Excellent	Excellent
Environmental Compliance	High	Good

This comparison helps engineers select the appropriate coating depending on environmental conditions and fastening requirements.

Benefits of Geomet 321 Fasteners

Superior Corrosion Protection

Provides excellent resistance in harsh outdoor and industrial environments.

Chromium-Free Technology

Supports environmentally conscious manufacturing requirements.

No Hydrogen Embrittlement

Suitable for high-tensile fasteners requiring reliable mechanical performance.

High Temperature Stability

Maintains protective performance under demanding operating conditions.

Uniform Thin Coating

Preserves thread accuracy while delivering durable protection.

Long Service Life

Designed for reliable performance in demanding industrial applications.

Product Range

We manufacture and supply:

Available Standards

Material Grades

Electro Zinc Plated Fasteners are widely used across multiple industries where appearance, precision and moderate corrosion resistance are required.

Technical Specifications

Parameter	Specification
Coating Type	Water-Based Zinc-Aluminum Flake
Process	Dip-Spin
Finish	Silver Grey
Corrosion Resistance	Excellent
Hydrogen Embrittlement	No
Thread Accuracy	Excellent
Environmental Compliance	Chromium-Free

Applications of Geomet 321

Geomet 321 Fasteners are widely used in industries where both corrosion resistance and environmental compliance are critical.

Automotive Industry

Chassis Components
Suspension Systems
Brake Assemblies
Engine Fasteners

Renewable Energy

Solar Mounting Systems
Wind Turbine Components

Construction

Structural Steel
Outdoor Installations
Industrial Buildings

Heavy Engineering

Industrial Machinery
Mining Equipment
Construction Equipment

Infrastructure

Bridges
Utility Installations
Steel Fabrication

Frequently Asked Questions

1. What is Geomet 321 coating?

Geomet 321 is a chromium-free water-based zinc-aluminum flake coating that provides excellent corrosion resistance for steel fasteners.

2. Is Geomet 321 environmentally friendly?

Yes, it is designed as a chromium-free coating solution suitable for environmentally conscious manufacturing.

3. What is the difference between Geomet and Dacromet?

Both are zinc-aluminum flake coatings, but Geomet is widely recognized for its chromium-free water-based formulation and strong environmental compliance.

4. Which industries use Geomet-coated fasteners?

Automotive, renewable energy, construction and heavy engineering industries commonly use Geomet-coated fasteners.

5. Can Geomet 321 be used on high-strength bolts?

Yes, it is suitable for high-strength fasteners because the coating process avoids hydrogen embrittlement.

6. Are Geomet 321 Fasteners available for export?

Yes, BRK Industries manufactures export-quality Geomet 321 Fasteners according to international standards.

BRK INDUSTRIES