Mutual Screw & Supply

3/8-16 X 5-1/2" Carriage Bolts | Fully Threaded | A307 Grade A Plain Steel (200 / Pkg.)

3/8-16 X 5-1/2" Carriage Bolts | Fully Threaded | A307 Grade A Plain Steel (200 - Main image
$56.57 $76.45 In stock

3/8-16 X 5-1/2" 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: 5-1/2"
  • Threads Per Inch: 16
  • Material: A307 Grade A Plain Steel
  • Finish: Plain
  • Thread Style: Fully Threaded
  • Pack Quantity: 200
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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)

George ★★★★★

The square neck grabbed perfectly into the wood on my deck rebuild, no spinning or slipping at all—these are solid bolts. At 5-1/2 inches they’re just the right length for thick beams, and the 200 pack means I’ve got extras for the next project.

Sophia ★★★★★

The rounded head sits flush against the wood, and the fact that they're fully threaded gave me plenty of bite when fastening a heavy gate together. These 5-1/2 inch bolts handled the job without a single issue.

Riley ★★★★★

The square neck on these bolts grabbed perfectly into the wood, so no spinning while I tightened the nuts—saved me a lot of frustration. All 200 pieces in the package looked clean and consistent, with no burrs or defects. Exactly what I needed for building a heavy-duty planter box.