Mutual Screw & Supply

5/16-18 X 4-1/2" Carriage Bolts | Fully Threaded | 316 Stainless Steel (50 / Pkg.)

5/16-18 X 4-1/2" Carriage Bolts | Fully Threaded | 316 Stainless Steel (50 / - Main image
$27.97 $44.39 In stock

5/16-18 X 4-1/2" 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: 4-1/2"
  • Threads Per Inch: 18
  • Material: 316 Stainless Steel
  • Finish: Plain
  • Thread Style: Fully Threaded
  • Pack Quantity: 50
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 (4.6 / 5 · 5 reviews)

Violet B. ★★★★★

The square neck is a lifesaver—pulls right into the wood and keeps the bolt from spinning while I tighten. These feel solid and corrosion-resistant, perfect for the outdoor bench I just built.

Joshua ★★★★★

These bolts are fully threaded, which made them much easier to use for a project where I needed extra grip length. The stainless steel feels strong and well-made, and they arrived securely packed.

Daniel J. ★★★★★

The square neck grabbed the wood perfectly on my first try, no spinning or cursing involved. These 316 stainless bolts are solid and the fully threaded length gave me plenty of grip for a 2x4 stack. Pack of 50 should last me through all my deck repairs.