Hillman 3/8 in. x 3 in. Zinc-Plated Steel Carriage Bolts, 50-Pack

Hillman 3/8 in. x 3 in. Zinc-Plated Steel Carriage Bolts, 50-Pack

Regular price $32.03

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

Durable Hillman carriage bolts made from zinc-plated steel for rust-resistant fastening in wood-to-wood or wood-to-metal applications. The rounded head creates a smooth, semi-flush finish while the square neck locks into wood to prevent spinning.


Key Features:

  • Rust-Resistant Zinc Plating: Helps protect against corrosion for long-lasting performance
  • Self-Locking Square Neck: Prevents bolt rotation in wood for easier installation
  • Smooth, Low-Profile Head: Creates a semi-flush finish without a separate washer
  • Coarse Thread, SAE Grade 2: Reliable grip for general-purpose fastening
  • Bulk 50-Pack: Convenient boxed packaging for projects and job sites

Specifications Table:

Specification Details
Diameter 3/8 in
Length 3 in
Material Steel
Finish Zinc-Plated
Grade 2
Thread Type Coarse
Unit of Measurement SAE
Packaging Type Boxed
Number in Package 50
Each Weight 5.300 lb
Product Type Carriage Bolt
Alternative UPC 037504830963

Frequently Asked Questions (FAQ):

Q: What materials are these bolts best suited for?
A: Designed to fasten a wooden face to wood or metal frames; the square neck bites into wood to prevent spinning.


Q: Can these be used outdoors?
A: Zinc plating offers rust resistance but may not be ideal for all exterior projects; consider hot-dip galvanized for harsh outdoor environments.


Q: Do I need a washer under the head?
A: Typically no—the rounded carriage head provides a semi-flush finish that often eliminates the need for a washer.


Q: What thread type do they have?
A: Coarse thread per SAE standards, suitable for general-purpose fastening.


Q: What size and length are included?
A: Each bolt is 3/8 inch diameter by 3 inches long; this package contains 50 bolts.


A Clean, Crafted Finish for Timber Details

These zinc-plated carriage bolts bring a tailored, streamlined note to carpentry—perfect for benches, gates, and statement woodwork. The domed head offers a refined, flush look while the square neck anchors with confidence. Pair them with oiled oak or painted pine to let hardware quietly elevate the piece. A small detail with big impact, they’re the finishing touch of effortless, polished living.


Secure your project with reliable, rust-resistant carriage bolts—add this 50-pack to your cart today.

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