Mutual Screw & Supply

5/16-18 X 9" Carriage Bolts | A307 Grade A Plain Steel (50 / Pkg.)

5/16-18 X 9" Carriage Bolts | A307 Grade A Plain Steel (50 / Pkg.) - Main image
$19.2 $26.66 In stock

5/16-18 X 9" 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
  • Sold in bulk packs

Specifications

  • Thread Size: 5/16-18
  • Length: 9"
  • Threads Per Inch: 18
  • Material: A307 Grade A Plain Steel
  • Finish: Plain
  • 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 (4.6 / 5 · 5 reviews)

Matthew ★★★★★

The square neck under the head grabbed the wood immediately when I tightened them, zero spinning or cursing. All 50 bolts came in the package with clean threads and a consistent finish, and they seated flush without any stripping issues.

Ryan E. ★★★★★

Nine inches is exactly what I needed for a timber frame repair, and the plain steel finish takes paint without any fuss. The square neck seated firmly into the wood, so I never had to wrestle with a spinning bolt while tightening the nut.

Lily K. ★★★★★

The square neck on these carriage bolts grabbed the wood instantly and didn't spin while I tightened the nut. Exactly what I needed for assembling a sturdy workbench frame in my garage.