High-Quality Roofing Bolts with Square Nuts: The Versatile Fastener for Construction
At Handan Bolt, we manufacture millions of Roofing Bolts (supplied complete with Square Nuts) annually. Located in Yongnian, the fastener capital of China, our factory specializes in producing these “Mushroom Head” bolts to meet global demand. While commonly known as “Roofing Bolts,” their utility extends far beyond just roof repair. They are the industry standard for securing cable trays, trunking, and fencing, making them a must-have item for hardware distributors and electrical contractors.
What is a Roofing Bolt?
A Roofing Bolt is a specialized type of machine screw characterized by its large, flat, low-profile head, often referred to as a “Mushroom Head” or “Truss Head.” Unlike hex bolts, these are driven by a screwdriver (typically Cross Recess/Phillips or Slotted). They are almost always paired with a Square Nut (Read more on Wikipedia) rather than a hex nut.
Key Design Features
Why is this specific design so popular?
- Mushroom Head: The wide head spreads the clamping load over a larger surface area. This is crucial when fastening thin materials like corrugated metal sheets, plastic guttering, or mesh fencing, preventing the bolt from pulling through the material.
- Low Profile: The smooth, rounded head sits almost flush against the surface, providing a neat finish and reducing snagging points.
- Square Nut: The square nut is designed to sit securely in the channels of metal cable trays or trunking, preventing it from spinning while the bolt is tightened. It is also easier to grip with pliers in tight spaces compared to a hex nut.
Material and Specifications
As indicated in your product specifications, we manufacture these bolts to deliver reliable performance for general construction use:
1. Grade 4.8 Carbon Steel
We use high-quality low carbon steel (Grade 4.8). This grade offers the perfect balance of tensile strength and ductility. It is strong enough to hold gutters and roofing sheets securely but is not brittle, ensuring it won’t snap under the thermal expansion and contraction of roof materials.
2. Zinc Plated Finish (Rust Protection)
Since these bolts are often used in damp environments (like gutters or outdoor fencing), corrosion resistance is vital. Our Roofing Bolts come with a bright Zinc Plated (Galvanized) finish. This sacrificial coating prevents the steel core from rusting, extending the lifespan of your installation.
3. Drive Type
Our standard production features a Cross Recess (Phillips) drive, which allows for fast installation using power drills. We can also manufacture traditional “Slotted” drives upon request, “According to Drawing.”
Common Applications
Despite the name, “Roofing Bolts” are incredibly versatile:
- Cable Tray & Trunking: The #1 application. Electricians use them to join lengths of metal cable tray together.
- Fencing: Joining mesh panels or chain-link fence brackets.
- Guttering: Securing brackets and joints in rainwater systems.
- DIY & Furniture: General low-duty fastening where a flat head is required for aesthetics.
Custom Manufacturing (“According to Drawing”)
While standard sizes like M6 x 12mm and M6 x 20mm are the most popular, Handan Bolt offers full customization.
- Sizes: M5, M6, M8 threads.
- Lengths: From short 10mm bolts up to 100mm long.
- Packaging: We can pack bolts and nuts pre-assembled or loose in separate bags, depending on your preference.
Why Source from Handan Bolt?
Huge Capacity: We produce these bolts on high-speed cold heading machines, ensuring low costs and fast delivery.
Complete Sets: We ensure every bolt comes with a perfectly matching square nut, so you never have mismatched parts.
Export Experience: We understand the specific packaging needs of the UK, African, and Southeast Asian markets.
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