Mutual Screw & Supply

5/16-18 X 2-1/4" Carriage Bolts | Fully Threaded | 316 Stainless Steel (100 / Pkg.)

5/16-18 X 2-1/4" Carriage Bolts | Fully Threaded | 316 Stainless Steel (100 / - Main image
$28.99 $42.01 In stock

5/16-18 X 2-1/4" Carriage Bolts in 316 Stainless 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
  • 316 Stainless Steel construction
  • Coarse thread for use in wood and with nuts and washers
  • Fully Threaded
  • Sold in bulk packs

Specifications

  • Thread Size: 5/16-18
  • Length: 2-1/4"
  • Threads Per Inch: 18
  • Material: 316 Stainless Steel
  • Finish: Plain
  • Thread Style: Fully Threaded
  • Pack Quantity: 100
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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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 (4.8 / 5 · 5 reviews)

Ruby Q. ★★★★★

The square neck grabbed the wood instantly and held tight while I cinched down the nut — no spinning, no swearing. Fully threaded all the way down made them easy to cut to size for a custom gate hinge. Pack of 100 should last me a decade.

Eli ★★★★★

The 316 stainless steel feels incredibly solid compared to the cheaper zinc ones I’ve used before, and the fully threaded shaft made mounting these into thick wood a breeze. For $XX, you get 100 of them, which is a steal given the quality.

Andrew ★★★★★

Installed these on a new dock bench last weekend and the 316 stainless steel is already proving its worth against the salt spray. The fully threaded shaft made it easy to get a solid bite even through treated lumber.