IMSCREWS 3/8"-16 x 5-1/2" Extra-Long 304 Stainless Steel Carriage Bolts (5 PCS)

Substantial Strength for Heavy Structural Timber Connections
The IMSCREWS 3/8" x 5-1/2" carriage bolt is engineered for heavy-duty structural projects requiring maximum shear resistance and deep penetration. With a robust 3/8-inch diameter and an extended 5.5-inch length, these bolts are well-suited for high-load joints where stability is critical, such as through-bolting multi-layered girders or securing heavy-duty hardware to thick 6x6 timber posts. Built for durability, they offer the stability necessary for long-term use in outdoor structures, garden gazebos, and industrial woodworking 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 visible railings, play sets, and heavy-duty 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: 3/8"-16 Coarse (UNC); Length: 5-1/2" (Measured from Under Head)
- Material: 304 (18-8) Stainless Steel; Full Thread

Pro-Tips:
1. Use a 3/8" 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

• Extreme Reach for Heavy Framing: The massive 5.5-inch length is custom-engineered for through-bolting oversized 6x6 posts and multi-layer structural girders, providing deep-seated stability.
• Full-Thread Clamping Power: Unlike partial threads, our full-thread design ensures consistent tension and maximum pull-out resistance across the entire 5.5 span of the joint.
• Marine-Grade 304 Stainless: Forged from premium 18-8 (304) stainless steel for ultimate rust protection in coastal environments and compatibility with corrosive ACQ treated wood.
• One-Way Self-Locking Install: The precision-cut square neck bites deep into wood grain, locking the bolt so you can tighten the nut from the opposite side without a secondary wrench.
• Smooth Safety Head: The low-profile domed head eliminates sharp protrusions, providing a professional finish that is safe for high-traffic decks, docks, and public structures.

Specifications

• ASIN: B0F2F6GJ5X
• Internal SKU: IMS0872
• Size: 3/8"-16 x 5-1/2"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Round
• Package Quantity: 5