Mutual Screw & Supply

5/16-18 X 1-1/4" Carriage Bolts | Fully Threaded | A307 Grade A Zinc Plated Steel (250 / Pkg.)

5/16-18 X 1-1/4" Carriage Bolts | Fully Threaded | A307 Grade A Zinc Plated - Main image
$12.22 $17.46 In stock

5/16-18 X 1-1/4" 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: 1-1/4"
  • Threads Per Inch: 18
  • Material: A307 Grade A Zinc Plated Steel
  • Finish: Zinc Plated
  • Thread Style: Fully Threaded
  • Pack Quantity: 125
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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 (4.6 / 5 · 5 reviews)

Samuel R. ★★★★★

These came in a sturdy little box and the zinc plating looks even and bright across all 250 pieces. I've been using them for a fence repair and the fully threaded shaft makes it easy to get a nut on from the back side.

Thomas P. ★★★★★

The square neck under the head grips the wood right away, so I didn’t have to hold the bolt in place while tightening—that alone saved me a ton of fiddling. Zinc plating looks clean and uniform across all 250 pieces, and the threads ran smooth through my pre-drilled holes.

Sophia V. ★★★★★

These bolts have a smooth, rounded head that looks much cleaner than a standard hex bolt for outdoor furniture. The threads are crisp and caught easily on the nut without any cross-threading. Exactly what I needed for a sturdy repair.