Mutual Screw & Supply

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

5/16-18 X 1/2" Carriage Bolts | Fully Threaded | A307 Grade A Zinc Plated Steel - Main image
$13.08 $17.68 In stock

5/16-18 X 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: 1/2"
  • 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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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 (4.2 / 5 · 5 reviews)

Claire M. ★★★★★

The square neck grabbed the wood instantly when I tightened it, saving me from needing a second wrench. Smooth rounded heads look clean on the project. Packaging was sturdy and all 250 arrived in perfect condition.

Kevin W. ★★★★★

These carriage bolts have that solid square neck underneath the head that really grips into the wood and stops them from spinning while you tighten the nut. The zinc plating looks clean and uniform across all 250 pieces in the package. Exactly what I needed for a sturdy outdoor bench repair.

Carter ★★★★☆

The zinc coating seems decent and should resist rust in my outdoor shed project. I just wish the bag had a resealable top, since I only needed about 80 for now.