Mutual Screw & Supply

5/16-18 X 4-1/2" Carriage Bolts | Fully Threaded | A307 Grade A Zinc Plated Steel (75 / Pkg.)

5/16-18 X 4-1/2" Carriage Bolts | Fully Threaded | A307 Grade A Zinc Plated - Main image
$14.03 $20.34 In stock

5/16-18 X 4-1/2" 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: 4-1/2"
  • Threads Per Inch: 18
  • Material: A307 Grade A Zinc Plated Steel
  • Finish: Zinc Plated
  • Thread Style: Fully Threaded
  • Pack Quantity: 25
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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 (4.8 / 5 · 5 reviews)

Penelope ★★★★★

The zinc plating on these bolts looks clean and should resist rust well on my deck project. They threaded smoothly into all the pre-drilled holes without any binding. The 75-count pack is perfect for finishing the job without running to the store again.

Alexander O. ★★★★★

The square neck seated perfectly into my wood beam so nothing spun while I torqued them down. The zinc plating looks clean and even across all 75, no flaking or rough edges. These are solid for the price.

Andrew V. ★★★★★

The zinc coating is nice and uniform, no flaking when I drove them into pressure-treated lumber. These are fully threaded, which made them ideal for sandwiching thicker beams together. The 75-count box is a solid deal for the price.