Mutual Screw & Supply

5/16-18 X 5-1/2" Carriage Bolts | Fully Threaded | A307 Grade A Zinc Plated Steel (50 / Pkg.)

5/16-18 X 5-1/2" Carriage Bolts | Fully Threaded | A307 Grade A Zinc Plated - Main image
$12.66 $16.88 In stock

5/16-18 X 5-1/2" Carriage Bolts in A307 Grade A Zinc Plated Steel. Carriage bolts feature a smooth, rounded head with a square neck underneath that pulls into the material to prevent the bolt from turning during installation, making them ideal for wood-to-wood and wood-to-metal connections.

  • Domed head with square anti-rotation neck
  • A307 Grade A Zinc Plated Steel construction
  • Coarse thread for use in wood and with nuts and washers
  • Fully Threaded
  • Sold in bulk packs

Specifications

  • Thread Size: 5/16-18
  • Length: 5-1/2"
  • Threads Per Inch: 18
  • Material: A307 Grade A Zinc Plated Steel
  • Finish: Zinc Plated
  • Thread Style: Fully Threaded
  • Pack Quantity: 25
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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (5.0 / 5 · 5 reviews)

Steven D. ★★★★★

The square neck on these carriage bolts grabbed the wood perfectly, so I didn't need a wrench to hold them while tightening the nut. These are solid for a heavy gate hinge I installed, and the zinc plating looks clean against the exposed metal.

John Z. ★★★★★

I needed some heavy-duty bolts for a pergola project, and these 5-1/2" carriage bolts were just the right length to secure the beams. The fully threaded shaft made installation smooth, and the zinc coating looks like it'll hold up well outdoors.

Edward Z. ★★★★★

The square neck under the head seated perfectly into the pre-drilled holes on my trailer hitch, so I didn’t need a wrench to hold them steady while tightening. Zinc coating looks clean and even, and all 50 threads were consistent with no burs.