Meet the Hillman 5/16 in. x 3-1/2 in. L Stainless Steel Carriage Bolt — a durable, weather-ready fastener designed to hold strong in outdoor and indoor joinery. This 25-pack boxed set provides reliable, ready-to-use hardware for multiple projects, from cozy DIY builds to larger outdoor installations.
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Size and fit: 5/16 in. diameter with a 3-1/2 in. length, ideal for wood-to-wood connections and thicker lumber assemblies.
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Material: Premium stainless steel for superior corrosion resistance, making it a dependable choice in humidity, rain, and coastal environments.
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Thread type: Coarse thread delivers quicker bite in softwood and common lumber, speeding up assembly without sacrificing grip.
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Head design: Domed carriage bolt head with a square undercut that sits into the wood, preventing rotation as you tighten the nut for a clean, snag-free finish.
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Packaging: 25 bolts per boxed set, providing enough fasteners to tackle multiple projects without constant reordering.
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Compatibility: Pair with matching nuts and washers (not included) for secure, lasting joints in fences, decks, pergolas, and other timber builds.
Ideal uses and applications
Whether you're building a new backyard deck, reinforcing a fence line, installing outdoor furniture, or assembling shelving supports, these stainless steel carriage bolts offer reliable, long-lasting performance. They’re particularly well-suited for outdoor projects where exposure to moisture demands materials that resist rust without compromising strength.
Why choose Hillman stainless carriage bolts
Hillman’s trusted hardware heritage shines through in every bolt: robust stainless steel construction, precise 5/16 in. diameter and 3-1/2 in. length, and a design that minimizes snagging while maximizing joint integrity. This isn’t just another fastener—it's a dependable solution for wood joinery that looks and performs as well as you expect from a leading hardware brand.
Installation tips
- Pre-drill a hole slightly larger than the bolt’s shank to prevent wood splitting.
- Insert the bolt so the square undercut seats into the wood surface, then thread on the nut from the opposite side.
- Tighten with a wrench until secure, taking care not to overtighten and risk damaging the lumber.
For enduring projects that demand corrosion resistance and dependable strength, the Hillman 5/16 in. x 3-1/2 in. Stainless Steel Carriage Bolt (25 pk) delivers consistent performance, straightforward installation, and long-term value for both DIY enthusiasts and professional builders.
