Highway Guardrail Bolts / Crash Barrier Splice Bolts (HDG, Grade 4.8/8.8) – Button Head Oval Neck – Manufacturer Direct

Reliable Highway Guardrail Bolts: Safety Critical Fasteners for Road Infrastructure

At Handan Bolt, we understand that road safety is non-negotiable. As a specialized manufacturer located in Yongnian, China, we produce high-performance Guardrail Bolts (also known as Splice Bolts or Post Bolts) that hold crash barriers together. These fasteners are the unsung heroes of highway infrastructure, designed to withstand high impact loads and harsh outdoor elements. We supply government contractors and road construction firms with bolts manufactured strictly According to Drawing specifications.

What is a Guardrail Bolt?

A Guardrail Bolt is a specialized fastener used to connect the corrugated steel beams of a Guard Rail (Read more on Wikipedia) system. They typically feature a smooth, rounded Button Head (Mushroom Head) which ensures that if a vehicle sideswipes the barrier, there are no sharp edges to snag the car, reducing the severity of the accident. Under the head, they usually have an Oval Neck or a rectangular nib that fits into the slotted hole of the rail, preventing the bolt from spinning while the nut is tightened.

Custom Manufacturing: “According to Drawing”

Unlike standard commercial bolts, guardrail fasteners often vary by region. As noted in our product specifications, we excel at producing these items based on your technical drawings. Whether you need compliance with:

• AASHTO M180 (American Standard)
• EN 1317 (European Standard)
• JT/T 281 (Chinese Standard)

We can adjust the head diameter, neck shape, and thread length to perfectly match your local road authority’s requirements.

Material Grades for Impact Resistance

We offer two primary strength grades to meet different safety levels:

• Grade 4.8 (Mild Steel): Suitable for standard roadside demarcation and parking lot barriers where high-speed impact is less likely.
• Grade 8.8 (High Tensile): Heat-treated carbon steel offering superior tensile strength. These are critical for highway and expressway applications where the barrier must contain heavy vehicles during a collision.

Surface Treatment: The Importance of HDG

Since guardrails are installed outdoors and exposed to rain, snow, and road salts, corrosion protection is paramount.

• Hot Dip Galvanized (HDG): This is our most recommended finish. We immerse the bolts in molten zinc to create a thick metallurgical bond (typically 40-80 microns). This provides decades of rust protection, even in coastal or snowy regions.
• Zinc Plated (Electric Galvanized): A more economical option for temporary barriers or indoor warehouse protection rails.

Types of Guardrail Fasteners We Produce

We supply the complete fastening system:

• Splice Bolts: Short, thick bolts (e.g., M16x35mm) used to join two rails together securely.
• Post Bolts: Longer bolts used to attach the rail to the wooden or steel support post.
• Anti-Theft Bolts: Specialized designs to prevent theft of infrastructure in remote areas.

Why Choose Handan Bolt for Infrastructure Projects?

Capacity: We can produce hundreds of tons of guardrail bolts monthly to keep up with massive highway paving schedules.
Quality Assurance: We perform rigorous salt spray testing (to check galvanization quality) and tensile testing to ensure every bolt meets the safety grade.
One-Stop Shop: We can also supply the matching Heavy Hex Nuts and Washers.

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