Mutual Screw & Supply

3/8-16 X 3-3/4" Carriage Bolts | Fully Threaded | A307 Grade A Plain Steel (400 / Pkg.)

3/8-16 X 3-3/4" Carriage Bolts | Fully Threaded | A307 Grade A Plain Steel (400 - Main image
$76.37 $113.99 In stock

3/8-16 X 3-3/4" 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: 3-3/4"
  • Threads Per Inch: 16
  • Material: A307 Grade A Plain Steel
  • Finish: Plain
  • Thread Style: Fully Threaded
  • Pack Quantity: 400
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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 (5.0 / 5 · 5 reviews)

William X. ★★★★★

I needed a bulk supply for a deck rebuild, and the square neck on these carriage bolts grabbed the wood tightly without spinning. The 400-count package will last me through several more projects.

Benjamin V. ★★★★★

Ordered these for a fencing project and the square neck really digs in nicely—no spinning at all during installation. The fully threaded design made quick work of securing the posts, and for the price per bolt you can't beat the value with 400 in a box.

Harper ★★★★★

Needed a bulk batch for a deck rebuild and these carriage bolts worked perfectly. The square neck under the head really does grab tight and stop spinning, exactly what I was hoping for.