Mutual Screw & Supply

7/16-14 X 3-1/4" Carriage Bolts | Fully Threaded | A307 Grade A Zinc Plated Steel (325 / Pkg.)

7/16-14 X 3-1/4" Carriage Bolts | Fully Threaded | A307 Grade A Zinc Plated - Main image
$82.9 $138.16 In stock

7/16-14 X 3-1/4" Carriage Bolts in A307 Grade A Zinc Plated 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 Zinc Plated Steel construction
  • Coarse thread for use in wood and with nuts and washers
  • Fully Threaded
  • Sold in bulk packs

Specifications

  • Thread Size: 7/16-14
  • Length: 3-1/4"
  • Threads Per Inch: 14
  • Material: A307 Grade A Zinc Plated Steel
  • Finish: Zinc Plated
  • Thread Style: Fully Threaded
  • Pack Quantity: 325
Before you pay

Check the method and total at checkout.

When it ships

Allow for processing time as well as the journey to you.

Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

View policy
If you need a refund

Keep your order number and contact the store to start.

Please contact us for the refund processing timeframe before returning an item.

View policy
Delivery costs

Review the cost for your destination and chosen service.

Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

View policy
Returning an item

Check the return conditions before sending anything back.

United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

View policy

Customer Reviews (4.4 / 5 · 5 reviews)

Ellie ★★★★★

The square neck under the head grabbed the wood instantly with zero spinning, which saved me a ton of frustration on a deck repair. All 325 bolts came in a sturdy box, counted right, and the zinc plating looks clean and even. These are solid for the price if you need a bulk supply.

Sophia A. ★★★★★

Finally got around to using these for a deck repair and the zinc coating is holding up well against a few rainy days. The 3-1/4 inch length was just right for sandwiching two 2x6s together.

Edward Q. ★★★★★

The square neck on these carriage bolts locked right into the wood as I tightened them, which made assembling the deck frame much easier than using standard hex bolts. Zinc plating looks good and the 325-count box is plenty for a big project, though I did find a few with slightly rough threads.