Mutual Screw & Supply

3/8-16 X 3" Carriage Bolts | Fully Threaded | A307 Grade A Plain Steel (450 / Pkg.)

3/8-16 X 3" Carriage Bolts | Fully Threaded | A307 Grade A Plain Steel (450 / - Main image
$76.07 $104.2 In stock

3/8-16 X 3" 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: 3/8-16
  • Length: 3"
  • Threads Per Inch: 16
  • Material: A307 Grade A Plain Steel
  • Finish: Plain
  • Thread Style: Fully Threaded
  • Pack Quantity: 450
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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 (5.0 / 5 · 5 reviews)

Daniel ★★★★★

Got these for a retaining wall I’m building, and the square neck grabbed into the wood right away without spinning. The 3-inch length was just right for sandwiching two 2x6s, and the plain steel finish is exactly what I needed for a project that’ll get painted anyway.

Olivia ★★★★★

I needed a hundred for a fence gate project, and every single one of these fully threaded 3/8-16 x 3" bolts threaded smooth and the square neck gripped tight. No stripped heads or bent shanks in the whole box.

Ellie P. ★★★★★

Installing these on a pergola, the square neck grabbed the wood immediately and kept every bolt from spinning as I tightened the nut. The fully threaded length gave me plenty of grip for thicker beams, and the pack of 450 should last through several projects. For plain steel carriage bolts, the fini