Metric Steel Heavy Hex Head Screws for Structural Applications

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Metric High-strength Steel Heavy Hex Head Screws for Structural Applications

What is a Heavy Hex Head Screw?

A Heavy Hex Head Screw is a high-strength fastener with a larger and thicker hexagonal head compared to standard hex bolts. The “heavy hex” design provides greater bearing surface and higher torque resistance , making it ideal for structural and heavy-duty applications . These screws are commonly used in construction, machinery, and infrastructure projects where high clamping force and reliability are critical.

Materials of Heavy Hex Head Screws

Heavy hex head screws are available in various materials to suit different load and environmental conditions:

Carbon Steel (Grade A325, A449, Grade 5, Grade 8) – High tensile strength for structural bolting.
Alloy Steel (ASTM A193 B7, B16) – Heat-treated for high-pressure and high-temperature applications.
Stainless Steel (A2/304, A4/316) – Corrosion-resistant for marine, chemical, and food industries.
Titanium – Lightweight, high strength, and corrosion-resistant for aerospace and medical applications.

Surface Finishes & Coatings

To enhance durability and corrosion resistance, heavy hex head screws can have different surface treatments:

Plain/Black Finish – No coating, used in indoor applications.
Zinc Plating (Yellow/White Zinc) – Basic corrosion protection for general use.
Hot-Dip Galvanizing – Thick zinc layer for outdoor and harsh environments.
Mechanical Galvanizing – Uniform zinc coating without hydrogen embrittlement.
Dacromet/Geomet® Coating – High corrosion resistance for automotive and industrial use.
Xylan®/PTFE Coating – Low friction and chemical resistance for specialized applications.

Specifications & Dimensions

Heavy hex head screws follow industry standards such as ASTM, ISO, DIN, and SAE . Common specifications include:

Applications of Heavy Hex Head Screws

Due to their high strength and durability , heavy hex head screws are widely used in:

Structural Steel Construction – Bridges, buildings, and transmission towers.
Heavy Machinery & Equipment – Mining, oil rigs, and industrial presses.
Power & Energy – Wind turbines, power plants, and pipelines.
Transportation – Rail tracks, truck chassis, and shipbuilding.
Infrastructure – Highway guardrails, dams, and stadiums.

Case Examples

Case 1: Bridge Construction

A civil engineering firm uses ASTM A325 heavy hex head screws to connect steel girders in a highway bridge. The hot-dip galvanized coating ensures long-term corrosion resistance.

Case 2: Wind Turbine Assembly

A renewable energy company installs ASTM A490 heavy hex screws in wind turbine bases. The high tensile strength withstands extreme wind loads.

Case 3: Mining Equipment

A mining operation uses Grade 8 alloy steel heavy hex screws to secure crusher machinery . The mechanical galvanizing prevents rust in humid underground conditions.

Heavy hex head screws are high-strength fasteners designed for structural and heavy-duty applications . Available in carbon steel, alloy steel, and stainless steel , they can be customized with various coatings for enhanced performance. Their larger head size and thicker shank provide superior load distribution and torque resistance , making them essential in construction, machinery, and infrastructure projects .