Hillman 3/8 in. x 4 in. Zinc-Plated Steel Carriage Bolt, 50-Pack3 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

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.