Mutual Screw & Supply

3/8-16 X 4" Carriage Bolts | Fully Threaded | A307 Grade A Plain Steel (75 / Pkg.)

3/8-16 X 4" Carriage Bolts | Fully Threaded | A307 Grade A Plain Steel (75 / - Main image
$15.11 $21.9 In stock

3/8-16 X 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: 4"
  • Threads Per Inch: 16
  • Material: A307 Grade A Plain Steel
  • Finish: Plain
  • Thread Style: Fully Threaded
  • Pack Quantity: 25
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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 (4.4 / 5 · 5 reviews)

Nicholas C. ★★★★★

The rounded heads look clean on my project, and the square neck really does bite into the wood to stop spinning during installation. I’ve got a full 75-count box, which is plenty for all the heavy framing I’m doing this weekend.

Kevin X. ★★★★★

Needed a solid batch for building a heavy-duty planter, and these fully threaded carriage bolts didn't spin or strip while I was tightening them. The square neck under the dome head really does grip the wood and lock it in place perfectly.

Elizabeth J. ★★★★☆

The 4-inch length worked perfectly for my deck repair, and the A307 steel feels solid enough for outdoor framing. Only wish the pack came with a few extra washers, but the fully threaded design made tightening straightforward.