Mutual Screw & Supply

5/16-18 X 6-1/2" Carriage Bolts | A307 Grade A Plain Steel (50 / Pkg.)

5/16-18 X 6-1/2" Carriage Bolts | A307 Grade A Plain Steel (50 / Pkg.) - Main image
$12.04 $19.42 In stock

5/16-18 X 6-1/2" 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
  • Sold in bulk packs

Specifications

  • Thread Size: 5/16-18
  • Length: 6-1/2"
  • 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 (4.8 / 5 · 5 reviews)

Jason D. ★★★★★

Used these to build a new deck railing and the 6-1/2 inch length was perfect for going through the 4x4 posts. The square neck grabbed the wood tight just like it should, no spinning at all.

Thomas H. ★★★★★

The square neck under the head really grabbed the wood firmly as I tightened them down, and all 50 bolts had clean, consistent threads without any burrs.

Christopher U. ★★★★★

I needed some solid carriage bolts for a deck repair project, and the 6-1/2 inch length was just right for going through the beam. The square neck really did pull in tight as I tightened them, preventing any spinning.