Meet the Hillman 3/8 in. x 6-1/2 in. Zinc-Plated Steel Carriage Bolt—the dependable workhorse for wood-to-wood connections. Designed for builders, hobbyists, and contractors alike, this single bolt delivers a sturdy, long-lasting hold for thick stock projects where a secure, non-turning joint is essential.
What makes this carriage bolt stand out
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Durable zinc-plated finish provides corrosion resistance in outdoor environments, making it ideal for decks, fences, pergolas, and garden structures.
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3/8-inch diameter with a 6-1/2-inch length offers a robust profile for thick boards and framing, giving you reliable clamping power without excessive complexity.
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Coarse SAE thread is optimized for wood joints, enabling easier driving and strong bite in both softwoods and many hardwoods.
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Square under the head grips the wood as you tighten, reducing the chance of the bolt turning and making installation smoother and quicker.
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Grade 2 steel delivers dependable, everyday strength for standard residential projects and light-duty commercial applications.
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Boxed packaging with a single piece ensures you get exactly what you need without extras, so you can start your project right away.
Ideal use cases
- Decking and railing assemblies where a secure, non-rotating fastener is required
- Fence construction, gates, and thick wood joinery where through-bolting is preferred
- Outdoor furniture, pergola connections, and other exterior woodwork exposed to the elements
- Any wood-to-wood joint that benefits from a strong, simple-to-install carriage bolt with a persistent grip
Practical installation insights
- Pair with a matching nut and washer on the opposite side for through-bolting and a clean finished look
- Drill a pilot hole suited to your wood type to reduce splitting and ensure precise alignment
- Place the bolt with the square neck seated in the wood grain; tighten the nut until the head sits flush against the surface
Why choose Hillman for your project
- Trusted brand with a long history of delivering reliable hardware for DIYers and professionals
- Consistent dimensions and finish across batches mean predictable results, shot after shot
- Finish and material balance designed to deliver solid performance in typical home and outdoor wood projects without overcomplicating installation
Specifications
- Diameter: 3/8 in
- Length: 6-1/2 in
- Material: Steel
- Finish: Zinc-plated
- Thread type: Coarse
- Grade: 2
- Package quantity: 1
- Packaging type: Boxed
- Unit of measurement: SAE
