Mutual Screw & Supply

3/8-16 X 3-1/4" Carriage Bolts | Fully Threaded | A307 Grade A Plain Steel (100 / Pkg.)

3/8-16 X 3-1/4" Carriage Bolts | Fully Threaded | A307 Grade A Plain Steel (100 - Main image
$15.75 $25.4 In stock

3/8-16 X 3-1/4" 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: 3-1/4"
  • Threads Per Inch: 16
  • Material: A307 Grade A Plain Steel
  • Finish: Plain
  • Thread Style: Fully Threaded
  • Pack Quantity: 50
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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 (4.2 / 5 · 5 reviews)

Ryan A. ★★★★★

The square neck on these carriage bolts really sinks into the wood nicely, so they don't spin when you're tightening them down. I used them for a heavy-duty gate hinge repair, and the 100-pack gives you plenty of extras for future projects.

Hazel R. ★★★★★

These bolts locked into my wooden trailer deck perfectly, the square neck grips tight and stops any spinning while you tighten the nut. The plain steel finish looks exactly right for a hardware project like this.

Ryan ★★★★☆

The fully threaded design made it easy to cut them to custom lengths for my project, which saved me a lot of hassle. The square neck grabbed nicely into the wood, though a few had slightly rough edges. Good value for the price.