Mutual Screw & Supply

5/16-18 X 2-1/2" Carriage Bolts | Fully Threaded | A307 Grade A Plain Steel (800 / Pkg.)

5/16-18 X 2-1/2" Carriage Bolts | Fully Threaded | A307 Grade A Plain Steel - Main image
$80.95 $126.49 In stock

5/16-18 X 2-1/2" 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
  • Fully Threaded
  • Sold in bulk packs

Specifications

  • Thread Size: 5/16-18
  • Length: 2-1/2"
  • Threads Per Inch: 18
  • Material: A307 Grade A Plain Steel
  • Finish: Plain
  • Thread Style: Fully Threaded
  • Pack Quantity: 800
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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)

Timothy ★★★★★

The smooth rounded head sits flush without catching on anything, and the square neck grips the timber so well I didn't need a second pair of hands. The fully threaded shaft made tightening up the whole deck frame a quick job. These are solid, dependable bolts for a fair price.

Abigail ★★★★★

Needed these for a pergola build and the fully threaded shaft was a real time-saver for stacking washers and nuts. The square neck seated perfectly in the pre-drilled holes so I didn't need a second wrench to keep them from spinning.

Abigail P. ★★★★★

These bolts fit perfectly into the pre-drilled holes on my trailer deck, and the square neck grabbed the wood tight so nothing spun while I tightened the nut. For the price, having 800 of them means I can finish the whole project and have plenty left over.