5/16 in x 3/4 in Zinc-Plated Steel Carriage Bolts (100-Pack)

Durable zinc-plated steel carriage bolts for wood-to-wood or wood-to-metal fastening. The dome head and square neck prevent spinning during installation, delivering a clean, secure finish for interior projects.

Key Features:

• Zinc-Plated Protection: Rust-resistant finish provides a clean, consistent look for indoor applications
• Secure Anti-Spin Design: Square neck beneath the dome head locks into wood as the nut tightens
• Reliable Wood Fastening: Ideal for decking, fencing, furniture and play equipment where removal from one side is needed
• Easy Install: Fits pre-drilled holes; pair with hex nuts and washers for a strong hold
• Standard Coarse Threads: 5/16-in diameter, 3/4-in length, 18 TPI for common hardware compatibility

Specifications Table:

Frequently Asked Questions (FAQ):

Q: What materials can these carriage bolts fasten?
A: They are designed to fasten a wooden face to wood or metal substrates.

Q: Are these suitable for outdoor use?
A: The zinc plating offers rust resistance but is primarily intended for interior use; it may not be ideal for all exterior projects.

Q: How do I install a carriage bolt?
A: Drill a pilot hole, insert the bolt through the hole, and secure with a hex nut and washer. The square neck locks into the wood to prevent spinning.

Q: What thread type and pitch do these bolts have?
A: Coarse thread with an 18 TPI pitch.

Q: How many bolts are included?
A: Package contains 100 bolts.

A Sleek, Secure Fastener for Clean-lined Projects

The smooth, dome head brings a refined, unobtrusive finish to cabinetry, benches, and custom built-ins. I love the way the square neck nests into wood, keeping the surface pristine while ensuring a steadfast hold. Use them to detail indoor furniture or accent structural elements where hardware should disappear. It’s a subtle yet essential touch for effortlessly polished, luxury interiors.

Choose Hillman’s zinc-plated carriage bolts for a clean, secure finish on your next interior build.