Mutual Screw & Supply

5/16-18 X 2-1/2" Carriage Bolts | Fully Threaded | A307 Grade A Zinc Plated Steel (200 / Pkg.)

5/16-18 X 2-1/2" Carriage Bolts | Fully Threaded | A307 Grade A Zinc Plated - Main image
$13.31 $21.12 In stock

5/16-18 X 2-1/2" 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: 2-1/2"
  • Threads Per Inch: 18
  • Material: A307 Grade A Zinc Plated Steel
  • Finish: Zinc Plated
  • Thread Style: Fully Threaded
  • Pack Quantity: 100
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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 (4.8 / 5 · 5 reviews)

Scarlett ★★★★★

The square neck grabbed instantly into the wood as I tightened them — no spinning at all. Exactly what I needed for assembling a heavy-duty workbench frame.

Ellie P. ★★★★★

These bolts fit perfectly into my pre-drilled holes and the zinc coating looks clean and uniform across all 200 pieces. The fully threaded shaft gave me a solid bite into the wood without any slipping.

Olivia ★★★★★

The zinc plating on these bolts is very even and smooth, and they drive in cleanly without any stripping. I used them to rebuild a wooden garden gate, and that square neck really did grab tight into the wood for a solid hold. Exactly what I needed for a heavy-duty repair job.