Mutual Screw & Supply

5/16-18 X 9-1/2" Carriage Bolts | A307 Grade A Plain Steel (125 / Pkg.)

5/16-18 X 9-1/2" Carriage Bolts | A307 Grade A Plain Steel (125 / Pkg.) - Main image
$43.58 $70.29 In stock

5/16-18 X 9-1/2" Carriage Bolts in A307 Grade A Plain 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 Plain Steel construction
  • Coarse thread for use in wood and with nuts and washers
  • Sold in bulk packs

Specifications

  • Thread Size: 5/16-18
  • Length: 9-1/2"
  • Threads Per Inch: 18
  • Material: A307 Grade A Plain Steel
  • Finish: Plain
  • Pack Quantity: 125
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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 (4.4 / 5 · 5 reviews)

Leo ★★★★★

Needed a bunch of these for a heavy-duty fence repair, and the 9-1/2-inch length gave me plenty of bite into the posts. The square neck seated perfectly in the pre-drilled holes, making them a breeze to tighten without spinning.

Daniel ★★★★★

I used these to build a strong pergola frame, and the plain steel finish was exactly what I needed for welding. The 9-1/2 inch length gave plenty of bite into the treated lumber, and the square neck held tight without spinning.

Richard U. ★★★★★

The square neck on these carriage bolts really does lock into the wood perfectly—no spinning while I tightened them. Needed that exact 9-1/2 inch length for a heavy timber project, and the plain steel finish matched the rest of the hardware nicely.