Hillman 5/16 in. x 4 in. Stainless Steel Carriage Bolt, 25-Pack

Regular price $51.99

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Stainless Steel 5/16 in. x 4 in. Carriage Bolts (25-Pack)

Durable Hillman stainless steel carriage bolts deliver a clean, semi-flush finish and superior corrosion resistance for outdoor and structural wood-to-wood or wood-to-metal projects. The domed head and square shoulder lock into place for secure fastening without a washer.


Key Features:

  • Corrosion-Resistant Stainless Steel: Ideal for outdoor and coastal applications
  • Semi-Flush Domed Head: Provides a smooth, finished look
  • Self-Locking Square Shoulder: Helps prevent spinning during installation
  • Coarse Thread SAE: Strong grip for common construction uses
  • 25-Pack Convenience: Boxed for easy storage and bulk projects

Specifications Table:

Specification Details
Brand Name Hillman
Material Stainless Steel
Length 4 inch
Diameter 5/16 inch
Thread Type Coarse
Unit of Measurement SAE
Head Style Domed carriage head
Shoulder Square shoulder, self-locking
Number in Package 25 pack
Packaging Type Boxed
Intended Use Fastening wooden face to wood or metal frame
Finish Stainless steel finish
Package Height 2 in
Package Width 3.5 in
Package Length 4.5 in
Package Weight 3.3 lbs

Frequently Asked Questions (FAQ):

Q: What materials can these carriage bolts fasten?
A: They are designed for fastening a wooden face to wood or metal frames.


Q: Do I need a washer with these bolts?
A: The flat, domed head is designed to provide a semi-flush finish without a washer.


Q: Are they suitable for outdoor use?
A: Yes. The stainless steel material offers superior protection against rust and corrosion.


Q: What is the thread type?
A: Coarse thread, SAE measurement.


Q: What size are these bolts?
A: 5/16-inch diameter by 4-inch length, packaged 25 per box.


Sleek Hardware with Lasting Strength

These stainless steel carriage bolts bring a refined, architectural polish to exposed timber or custom built-ins. The smooth domed head is a subtle design note that reads clean and intentional, while the square shoulder locks into place for a crisp finish. Use them to accent outdoor pergolas or statement shelving where hardware becomes part of the aesthetic. A small detail that signals quality—and elevates everyday spaces to luxe living.


Secure your next build with stainless steel reliability—add this 25-pack of Hillman carriage bolts to your project today.

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