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

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Our Carriage Bolts – Easy to Install for All Projects

We supply carriage bolts designed for easy installation, even for DIYers. They feature a square neck that locks into wood or metal to prevent spinning, so you only need to tighten the nut (no need to hold the bolt head). Available in various sizes and materials (steel, galvanized, stainless steel), they work for door/window installation, furniture assembly, or outdoor builds. Paired with our carriage nuts and washers, these bolts simplify installation while ensuring secure fastening—backed by our professional guidance.
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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

Installing carriage bolts is a straightforward process that requires some basic tools and attention to detail to ensure a secure and reliable connection. Carriage bolts are characterized by their square - shaped shoulders under the head, which prevent the bolts from rotating when tightened, making them ideal for a wide range of applications, from woodworking to construction. The first step in installing carriage bolts is to prepare the materials and tools. You will need the carriage bolts themselves, the appropriate nuts (such as carriage nuts or hex nuts), a drill with the correct drill bit size, a wrench or socket set for tightening the nuts, and a measuring tape or ruler to ensure accurate hole placement. Next, mark the locations where the holes will be drilled. This is crucial for ensuring that the carriage bolts are properly aligned and that the connection is strong. Use a measuring tape or ruler to measure and mark the positions accurately, especially if you are working on a project that requires precise dimensions, such as building a piece of furniture or installing a gate. Once the holes are marked, use a drill with the appropriate drill bit to create the holes. The size of the drill bit should match the diameter of the carriage bolt. Drill the holes to the correct depth, ensuring that the square shoulder of the carriage bolt will fit snugly into the hole to prevent rotation. After drilling the holes, insert the carriage bolts through the holes. Make sure that the square shoulder is positioned against the surface to prevent the bolt from turning. Then, place the appropriate nut on the threaded end of the bolt. Using a wrench or socket set, tighten the nut until it is snug. Be careful not to over - tighten the nut, as this could damage the materials or the bolt itself. Finally, inspect the installation to ensure that the carriage bolts are securely in place and that the connection is stable. Check for any signs of looseness or misalignment, and make any necessary adjustments. If you encounter any difficulties during the installation process or have questions about the proper installation of carriage bolts, please contact us for assistance.

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.
Yes, our rubber washers use elastomers (silicone, nitrile) resisting high/low temps, chemicals, and moisture. They seal leak-proof for plumbing/automotive/industrial use, with customization available for specific conditions.
Yes, our cable ties are versatile. UV-resistant for outdoor (garden cables), reusable/flame-retardant for indoor (electrical). Sizes fit different bundle weights, meeting home/industrial needs.

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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.