3/8 in. x 4 in. Zinc-Plated Carriage Bolts (50-Pack)

Heavy-duty Hillman carriage bolts made from zinc-plated steel for corrosion resistance and reliable fastening. Ideal for wood-to-wood or wood-to-metal applications where a smooth, rounded head finish is desired.

Key Features:

• Durable Zinc Plating: Resists rust and corrosion for long-lasting outdoor and indoor use
• Rounded Head + Square Neck: Pulls tight and prevents bolt spin in pre-drilled square holes
• Versatile Use: Secure decks, fences, playsets, and general construction projects
• Coarse Thread, Grade 2: Provides strong holding power for common fastening tasks
• Bulk Value Pack: 50 bolts sized 3/8 in. diameter x 4 in. length for project efficiency

Specifications Table:

Frequently Asked Questions (FAQ):

Q: What nuts and washers should I use?
A: Use 3/8 in.-16 hex nuts with flat and lock washers compatible with zinc-plated hardware.

Q: Can these be used outdoors?
A: Yes. The zinc plating provides basic corrosion resistance suitable for many outdoor applications; for harsh coastal environments, consider hot-dip galvanized or stainless steel.

Q: Do these have coarse or fine threads?
A: They are 3/8 in.-16 coarse thread.

Q: What drill size is recommended?
A: Drill a 3/8 in. hole; a square recess under the head will seat into the wood to prevent turning during tightening.

Q: Are nuts included?
A: No. This listing is for carriage bolts only; purchase matching nuts and washers separately.

A Clean, Polished Finish That Disappears Into the Design

The rounded, low-profile head offers a refined, tailored look on decks and garden structures, letting the form feel intentional and uncluttered. I love the subtle sheen of zinc plating—it catches light just enough to feel crisp without shouting. Use them on a cedar gate or a painted pergola where the smooth dome becomes a quiet design note. It’s the kind of hardware that elevates everyday builds into a more luxurious, composed experience.

Upgrade your projects with these corrosion-resistant, 3/8 in. x 4 in. Hillman carriage bolts—stock up with the 50-pack and build with confidence.