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Description
Hillman 5/16 in. x 3 in. Zinc-Plated Steel Carriage Bolt, 100-Pack5 16 in. x 3 in. Zinc Carriage Bolts (100 Pack) Zinc plated steel carriage bolts designed for fastening wood to wood or metal while providing a smooth, low profile dome head finish. The square shoulder locks into the material to prevent spinning during tightening, delivering a clean, secure install for decks, fences, carts, and general projects. Key Features: Zinc Plated Protection: Resists rust and corrosion for durable indoor and light outdoor use
5/16 in. x 3 in. Zinc Carriage Bolts (100-Pack)
Zinc-plated steel carriage bolts designed for fastening wood to wood or metal while providing a smooth, low-profile dome head finish. The square shoulder locks into the material to prevent spinning during tightening, delivering a clean, secure install for decks, fences, carts, and general projects.
Key Features:
- Zinc-Plated Protection: Resists rust and corrosion for durable indoor and light outdoor use
- Low-Profile Dome Head: Creates a smooth, snag-free surface ideal where clearance is limited
- Square Shoulder Lock: Grips the material to prevent bolt rotation—no washer needed under the head
- Multi-Material Use: Fastens wood to wood or wood to metal with reliable holding power
- Installation Tip: Pre-drill a hole matching the bolt diameter for best results
Specifications Table:
| Specification | Details |
|---|---|
| Bolt Diameter | 5/16 in. |
| Length | 3 in. |
| Thread Size | 5/16-18 UNC |
| Material | Steel |
| Finish | Zinc-plated |
| Head Type | Dome (carriage) head |
| Shoulder | Square shoulder under head |
| Pack Quantity | 100 pieces |
| Intended Use | Fasten wood to wood or wood to metal |
| Installation Recommendation | Pre-drill hole matching bolt diameter |
Frequently Asked Questions (FAQ):
Q: What materials can these carriage bolts fasten?
A: They are designed to fasten a wood face to either wood or metal.
Q: Do I need a washer under the head?
A: No— the square shoulder seats in the material to prevent turning, eliminating the need for a washer under the head.
Q: Are these suitable for outdoor use?
A: The zinc plating offers moderate corrosion resistance, suitable for indoor and some light outdoor applications; for harsh environments, consider stainless or hot-dip galvanized.
Q: What drill size should I use?
A: Pre-drill a hole that matches the bolt diameter (5/16 in.) for proper fit.
Q: What nuts are compatible?
A: Use 5/16 in.-18 coarse thread nuts and washers as needed on the nut side.
A Clean, Domed Detail for Seamless Strength
The soft dome of this carriage bolt delivers a polished, unobtrusive accent—strength that disappears into the design. I love how the square shoulder locks in, keeping the head flush and refined on benches, gates, and utility carts. Pair it with zinc hardware for a cohesive, silvery sparkle that feels both functional and elevated. It’s the quiet essential that makes everyday builds feel luxe and intentional.
Secure your next project with these zinc-plated carriage bolts—order the 100-pack and build with strength and a clean, low-profile finish.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy