IMSCREWS 1/2"-13 x 4" Heavy-Duty 304 Stainless Steel Carriage Bolts (5 PCS)

Substantial Support for Structural Post Connections
The IMSCREWS 1/2" x 4" carriage bolt is engineered for heavy-duty structural projects requiring maximum shear resistance and deep penetration. With a robust 1/2-inch diameter and a 4-inch length, these bolts are the ideal choice for securing standard 4x4 timber posts (actual 3.5"). They provide the necessary reach to penetrate the wood while leaving 0.5" of thread to accommodate washers and nuts for a snug, permanent connection. Built for durability, they offer the stability required for outdoor structures, deck framing, and landscape timber 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 a safe 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 Size: 1/2"-13 Coarse (UNC); Length: 4" (Under Head)
- Material: 304 (18-8) Stainless Steel; Full Thread

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

Key Features

• Massive Load-Bearing Diameter: The robust 1/2-inch shank provides industry-leading shear strength and structural integrity, specifically designed for heavy-duty timber framing and anchoring.
• Full 4-Inch Deep Reach: Well-suited for through-bolting standard 4x4 structural posts or joining multiple heavy beam layers, ensuring a safe, rock-solid connection that smaller bolts can't match.
• Marine-Grade 304 Stainless: Forged from premium 18-8 (304) stainless steel for maximum defense against saltwater air and corrosive ACQ pressure-treated lumber in outdoor foundations.
• High-Torque Self-Locking Neck: The heavy-duty square shoulder bites deep into the wood, locking the bolt firmly in place to allow for high-tension tightening from the nut side alone.
• Tamper-Resistant Safety Dome: The smooth round head provides a professional snag-free finish while preventing unauthorized removal¡ªessential for public docks, parks, and large outdoor structures.

Specifications

• ASIN: B0F2F9GV8Z
• Internal SKU: IMS0905
• Size: 1/2"-13 x 4"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Round
• Package Quantity: 5