Mutual Screw & Supply

5/16-18 X 1-1/2" Carriage Bolts | Fully Threaded | A307 Grade A Zinc Plated Steel (250 / Pkg.)

5/16-18 X 1-1/2" Carriage Bolts | Fully Threaded | A307 Grade A Zinc Plated - Main image
$11.87 $18.54 In stock

5/16-18 X 1-1/2" 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: 1-1/2"
  • 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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Delivery costs

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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Returning an item

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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)

Elizabeth Z. ★★★★★

These bolts fit perfectly into the pre-drilled holes on my trailer frame, and the square neck locked in tight without spinning. The 250-count package will last me through several projects.

Avery ★★★★★

The zinc coating looks even and clean across all 250 pieces, and the square neck seated firmly into my oak boards without any spinning. For less than a dollar a bolt, these handled a full deck repair with zero stripped heads.

Zoe Z. ★★★★★

The square neck on these bolts grabbed perfectly as I tightened them into the wood frame—no spinning at all. For the price of a 250-pack, the threading is consistent and clean, which saved me a ton of time on my deck project.