Heavy-Duty Carriage Bolts | Anti-Corrosion & Custom Sizes

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Our Round Head Carriage Bolt – Smooth for Visible Fastening

With decades of experience, we produce round head carriage bolts featuring a smooth, rounded head that adds a clean look to visible applications (outdoor furniture, handrails, decorative structures). The square neck prevents spinning during installation, and the threaded shank works with carriage nuts for secure fastening. Made from durable materials (steel, galvanized, stainless steel), they resist corrosion and are easy to install with basic tools. These bolts blend functionality with aesthetics for visible projects.
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Why choose us?

High - Strength Carriage Bolts for Heavy - Duty Projects

Our carriage bolts are engineered for heavy - duty applications in construction, machinery, and outdoor projects. The square neck design prevents the bolt from rotating during installation, making the fastening process more efficient. Made from high - strength steel, they can withstand significant loads and vibrations. We offer a variety of sizes and finishes, including galvanized and stainless steel options for enhanced corrosion resistance. With our extensive industry knowledge and professional manufacturing process, you can rely on our carriage bolts for your most demanding projects.

Size - Customizable Carriage Bolts for Specific Projects

We recognize that not all projects can be completed with standard - sized carriage bolts. That's why we offer size - customizable carriage bolts. Our professional team can work with you to determine the exact length, diameter, and thread pitch you need for your specific project. Whether it's a unique construction project or a custom - made piece of machinery, our customizable carriage bolts can provide the perfect fit. With our advanced manufacturing capabilities and 30 - year history, we can produce high - quality, customized carriage bolts efficiently.

Anti - Corrosion Coated Carriage Bolts for Outdoor Use

For outdoor projects, our anti - corrosion coated carriage bolts are a great choice. These bolts are coated with a special layer that protects them from rust and corrosion caused by rain, snow, and humidity. Whether you're building a deck, a fence, or an outdoor furniture set, our anti - corrosion carriage bolts will maintain their strength and appearance over time. With our 30 - year experience in hardware manufacturing, we ensure that the coating is evenly applied and adheres firmly, providing long - lasting protection against the elements.

Related products

Round head carriage bolts are a popular type of fastener known for their distinctive round - shaped head and square - shaped shoulder under the head. These bolts are widely used in various applications where a smooth, rounded surface is desired on the visible side of the connection, while still providing the stability and security of a carriage bolt. The round head of these bolts offers several advantages. It provides a clean and aesthetically pleasing appearance, making them suitable for applications where the fastener will be visible, such as in furniture assembly or decorative woodworking projects. For example, when building a wooden coffee table, round head carriage bolts can be used to connect the legs to the tabletop, creating a seamless and attractive look. The square shoulder under the head prevents the bolt from rotating when tightened, ensuring a secure and stable connection. This feature is particularly important in applications where the bolt will be subject to vibrations or movement, such as in the assembly of machinery or equipment. Round head carriage bolts are available in a variety of materials, including steel, stainless steel, and brass, allowing users to choose the right material based on the specific requirements of the project. Steel round head carriage bolts are a cost - effective option for general - purpose applications, while stainless steel bolts offer excellent corrosion resistance, making them ideal for outdoor or marine environments. Brass round head carriage bolts are often used in decorative applications due to their attractive golden color. When installing round head carriage bolts, it is important to use the correct size and type of nut to ensure a proper fit. The installation process is similar to that of other carriage bolts, involving drilling holes, inserting the bolts, and tightening the nuts. If you need more information about round head carriage bolts or would like to discuss your specific project requirements, please contact us.

Frequently Asked Questions

Are Zhongsheng’s cotter pins compatible with standard fasteners?

Yes, our cotter pins match standard bolts/nuts. Made of high-strength steel, they prevent loosening under vibration, with consistent sizing via strict quality control, suitable for machinery/automotive/DIY projects.
Our copper washers use high-purity copper, offering good conductivity and corrosion resistance. Ideal for plumbing (sealing) and electrical connections, they distribute pressure evenly, lasting long per our 30-year quality standard.
Our screw assortment has various screws (wood, sheet metal, machine) in sizes/materials, packed in organized plastic boxes. It covers most DIY needs (furniture, repairs), saving time on sourcing individual screws.
Our felt pads prevent scratches, reduce noise, and anti-slip. Self-adhesive for easy installation, fitting furniture feet (chairs, tables), with thicknesses for heavy/light use, durable for long protection.

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Customer Reviews

Linda Scott
Reliable Carriage Bolts for Gate Installation

I installed a new gate in my backyard, and these carriage bolts worked perfectly. The bolts are sturdy, and they hold the gate hinges securely, so the gate doesn’t sag. The threads are smooth, making it easy to tighten the nuts, and the finish matches the gate’s hardware. The PP box packaging was durable, keeping the bolts safe during installation. The price is affordable, and the quality is as good as more expensive brands. I recommend them for any gate or fence project.

Charles Adams
Custom Carriage Bolts for Industrial Equipment

Our factory needed custom-sized carriage bolts for a piece of industrial equipment, and Zhongsheng Hardware delivered exactly what we needed. The bolts are made of high-quality materials, and they fit the equipment perfectly. The professional team worked closely with us to ensure the specifications were correct, and the delivery was on time. The bolts have held up under heavy use, and they’ve improved the equipment’s performance. Great customization service and high-quality products.

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Why Our Carriage Bolts? Heavy-Duty & Weather-Resistant

Why Our Carriage Bolts? Heavy-Duty & Weather-Resistant

Ideal for decks, fences, or machinery, our carriage bolts have anti-spin necks, corrosion-resistant coatings, and come in plastic-absorbing boxes. We offer quality at good prices and custom sizes. With 30 years of experience, we’re trusted by foreign firms. Contact us now for more on your heavy-duty needs.