Hillman 5/16 in. x 3-1/2 in. Zinc-Plated Steel Carriage Bolt, 50-Pack

Hillman 5/16 in. x 3-1/2 in. Zinc-Plated Steel Carriage Bolt, 50-Pack

Regular price $44.93

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5/16 in. x 3-1/2 in. Zinc-Plated Carriage Bolts (50-Pack)

Durable zinc-plated steel carriage bolts for secure fastening in wood and metal projects. The rounded head and square neck prevent turning for a clean, finished look. Pack of 50 for bulk jobs and reliable performance.


Key Features:

  • Corrosion-Resistant Finish: Zinc-plated steel resists rust for indoor/outdoor use
  • Secure Hold: Square neck under domed head prevents bolt rotation during tightening
  • Versatile Size: 5/16 in. diameter by 3-1/2 in. length suits a wide range of builds
  • Bulk Value: 50-pack ideal for decking, fencing, and general construction
  • Trusted Quality: Manufactured by Hillman for consistent performance

Specifications Table:

Specification Details
Diameter 5/16 in.
Length 3-1/2 in.
Material Steel
Finish Zinc-plated
Head Type Domed (carriage) head
Neck Type Square neck
Pack Quantity 50
Product Dimensions (package) 8.6 x 4.3 x 3.5 in
Package Weight 8.2 lb
Brand Hillman

Frequently Asked Questions (FAQ):

Q: What material are these bolts made from?
A: Zinc-plated steel for strength and corrosion resistance.


Q: Do these bolts include nuts or washers?
A: Nuts and washers are typically sold separately; verify your project needs.


Q: Where are carriage bolts best used?
A: Commonly in wood connections such as decking, fencing, and furniture where a smooth, rounded head is preferred.


Q: How does the square neck help during installation?
A: It locks into the material to prevent the bolt from turning while you tighten the nut.


Q: Are these suitable for outdoor applications?
A: Yes, the zinc plating offers rust resistance suitable for many outdoor uses; for highly corrosive environments, consider stainless or hot-dip galvanized options.


A Polished, Industrial Touch with Everyday Strength

These zinc-plated carriage bolts bring a refined industrial detail to any project, marrying function with a clean, domed silhouette. The gleam of the finish adds subtle sophistication while the square neck ensures a seamless, secure set. Style them with natural woods and matte black hardware for a modern, grounded look. Essential hardware that elevates craftsmanship to a luxurious standard.


Secure your projects with Hillman’s reliable, corrosion-resistant carriage bolts—add this 50-pack to your toolkit today.

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