Mutual Screw & Supply

3/8-16 X 6" Carriage Bolts | Fully Threaded | A307 Grade A Plain Steel (175 / Pkg.)

3/8-16 X 6" Carriage Bolts | Fully Threaded | A307 Grade A Plain Steel (175 / - Main image
$47.53 $72.02 In stock

3/8-16 X 6" 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: 6"
  • Threads Per Inch: 16
  • Material: A307 Grade A Plain Steel
  • Finish: Plain
  • Thread Style: Fully Threaded
  • Pack Quantity: 175
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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 (4.6 / 5 · 5 reviews)

Hazel L. ★★★★★

The square neck under the head seats perfectly into the wood I'm using for a raised garden bed frame, so I didn't need a second wrench to stop them from spinning. All 175 came out of the box with clean threads and the plain steel finish is exactly what I was expecting for outdoor framing.

Jacob ★★★★★

The square neck grabbed instantly when I tightened the first one in a treated pine post—no spinning at all, which is rare with cheaper bolts. They’re plain steel so expect surface rust outdoors, but indoors these 6" lengths are plenty stout.

Adam ★★★★★

The square neck on these carriage bolts grabbed tight into the wood as I tightened the nut, so no spinning at all. All 175 pieces came clean with no rust or burrs, and the 6-inch length was exactly what I needed for a heavy-duty deck repair.