Mutual Screw & Supply

1/2-13 X 20" Carriage Bolts | A307 Grade A Zinc Plated Steel (45 / Pkg.)

1/2-13 X 20" Carriage Bolts | A307 Grade A Zinc Plated Steel (45 / Pkg.) - Main image
$91.49 $140.75 In stock

1/2-13 X 20" 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
  • Sold in bulk packs

Specifications

  • Thread Size: 1/2-13
  • Length: 20"
  • Threads Per Inch: 13
  • Material: A307 Grade A Zinc Plated Steel
  • Finish: Zinc Plated
  • Pack Quantity: 45
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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)

Robert ★★★★★

Installed these on a large deck pergola and the square neck under the head really dug in and kept the bolts from spinning. The zinc plating looks good and should hold up outdoors.

William B. ★★★★★

Used these for a heavy-duty gate hinge repair, and the 20-inch length was exactly what I needed to get through a thick wooden post. The zinc coating seems solid, no rust after a few weeks of rain.

Olivia H. ★★★★★

The square neck on these carriage bolts really dug in tight when I tightened them down, no spinning or stripping like with cheaper ones. I used them to build a heavy-duty gate and the whole thing feels solid—definitely beefier than the smaller hardware I'd tried before.