Hillman 5/16 in. x 5 in. Galvanized Carriage Bolts (50-Pack)

Durable steel carriage bolts with a hot-dipped galvanized finish to resist rust in outdoor and heavy-duty applications. The round head and square neck provide a clean, semi-flush look and self-locking grip in wood-to-wood or wood-to-metal projects. Ideal for decks, fencing, and structural framing.

Key Features:

• Rust-Resistant Finish: Hot-dipped galvanization for superior corrosion protection in outdoor environments
• Secure Hold: Square neck under the round head locks into wood to prevent spinning during installation
• Clean Appearance: Low-profile round head delivers a neat, semi-flush finish without a washer
• Heavy-Duty Construction: Grade 2 steel and coarse threads for reliable fastening strength
• Bulk Value Pack: 50 bolts per boxed package for larger projects

Specifications Table:

Frequently Asked Questions (FAQ):

Q: What size drill bit should I use for these 5/16 in. carriage bolts?
A: Use a 5/16 in. hole for the shank; in wood, slightly undersize may improve neck bite. For metal, match 5/16 in. and deburr.

Q: Are these suitable for outdoor use?
A: Yes. The hot-dipped galvanized finish provides excellent rust protection for exterior projects like decks and fences.

Q: Do I need a washer with the round head?
A: Typically no; the broad round head provides a semi-flush finish. Use a nut and optional washer under the nut if desired.

Q: What nut and thread type pairs with these bolts?
A: These use coarse SAE threads; pair with matching 5/16 in. coarse-thread nuts.

Q: Can they be used in treated lumber?
A: Hot-dipped galvanized fasteners are appropriate for most pressure-treated lumber; always follow local code and lumber manufacturer guidance.

A clean, industrial accent with enduring strength

The rounded head of this carriage bolt lends a refined, minimal silhouette that whispers utility-chic. Its galvanized sheen brings a subtle, matte texture—perfect for modern rustic detailing on decks, gates, and furniture. Use it as a deliberate design element, lining up heads in symmetrical rows to create quiet rhythm across wood surfaces. It’s a hardworking staple that elevates function into effortless, everyday luxury.

Upgrade your project with rust-proof, clean-finished fastening—add this 50-pack of Hillman galvanized carriage bolts to your cart now.