IMSCREWS 5/16"-18 x 3" Heavy-Duty 304 Stainless Steel Carriage Bolts (10 PCS)

Substantial Support for Structural Timber Connections
The IMSCREWS 5/16" x 3" carriage bolt is engineered for projects requiring reliable shear resistance and stable structural support. With a robust 5/16-inch diameter and a 3-inch length, these bolts are well-suited for high-load joints where stability is critical, such as joining two layers of standard dimensional lumber (2x4 or 2x6) or reinforcing deck frames. Built for durability, they offer the stability necessary for long-term use in outdoor structures, garden furniture, and residential DIY projects.

High Durability and Safety-Focused Design
Forged from premium 18-8 (304) stainless steel, these fasteners are highly resistant to rust and corrosion in coastal or humid environments. The smooth round head offers a clean appearance that reduces snagging hazards, making them an ideal choice for railings, play sets, and benches. The integrated square neck prevents the bolt from spinning, allowing for easy, one-sided installation with a single wrench from the nut side.

Specifications:
- Thread: 5/16"-18 Coarse; Length: 3" (Under Head)
- Material: 304 (18-8) Stainless Steel; Full Thread

Pro-Tips:
1. Use a 5/16" drill bit to ensure a snug, structural fit for the square neck.
2. Pair with stainless steel flat washers and nuts on the nut side to distribute structural load and protect wood fibers.

Key Features

• Self-Locking Square Neck: Features a precision-engineered square neck beneath the head that bites into wood, preventing the bolt from spinning while the nut is tightened for easy, one-sided installation.
• Full Thread Maximum Grip: The fully threaded 3-inch shank provides maximum grip and enhanced fastening power along its entire length, making it ideal for deep timber and structural projects.
• 304 Marine Grade Stainless: Forged from premium 18-8 (304) Stainless Steel for superior corrosion defense. Essential for docks, coastal decks, and ACQ pressure-treated lumber.
• Heavy-Duty Structural Strength: The 5/16 diameter delivers professional-grade shear resistance. At 3 long, these bolts are Well-suited for through-bolting thick posts and heavy framing.
• Snag-Free Aesthetic Finish: The smooth, domed round head provides a professional finish without sharp edges, ensuring safety for playground equipment, fencing, and furniture.

Specifications

• ASIN: B0F2F58VCG
• Internal SKU: IMS0808
• Size: 5/16"-18 x 3"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Round
• Package Quantity: 10