IMSCREWS 3/8"-16 x 3-1/2" Heavy-Duty 304 Stainless Steel Carriage Bolts (2 PCS)

Substantial Support for Deep Structural Connections
The IMSCREWS 3/8" x 3-1/2" carriage bolt is engineered for projects requiring deep penetration and stable structural support. With a robust 3/8-inch diameter and a 3.5-inch length, these bolts are well-suited for high-load joints, such as through-bolting standard 4x4 posts or reinforcing deck-to-post connections. Built for durability, they offer the stability necessary for long-term use in outdoor structures, gazebos, and industrial garden projects.

High Durability and Safety-Focused Design
Forged from 18-8 (304) stainless steel, these fasteners are highly resistant to corrosion in outdoor environments and are compatible with pressure-treated lumber. 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 rotation, allowing for easy, one-sided installation with a single wrench from the nut side.

Specifications:
- Thread: 3/8"-16 Coarse; Length: 3-1/2" (Under Head)
- Material: 304 (18-8) Stainless Steel; Full Thread

FAQ:
Q: Drill bit size? A: A 3/8" bit provides a snug, structural fit.
Q: Coastal safe? A: Yes, 304 SS offers high resistance to salt air corrosion.

Pro-Tips:
1. Ensure the pilot hole is perfectly perpendicular for 3.5" bolts to avoid alignment issues in thick timber.
2. Pair with a heavy-duty flat washer on the nut side to distribute structural load and protect wood fibers.

Key Features

• Self-Locking Square Neck: Engineered with a precision-forged square neck beneath the head that bites into wood or locks into square metal holes, preventing the bolt from spinning while the nut is tightened for a secure, one-sided install.
• Full Thread Maximum Grip: The fully threaded shank provides maximum grip and enhanced fastening power along the entire 3.5-inch length, making it ideal for deep timber connections and heavy-duty structural DIY projects.
• 304 Marine Grade Stainless: Forged from premium 18-8 (304) Stainless Steel for superior corrosion defense. Essential for outdoor structures, coastal decks, docks, and ACQ pressure-treated lumber applications.
• Extended Structural Strength: The 3/8 diameter delivers professional-grade shear resistance. At 3.5 long, these bolts are Well-suited for through-bolting thick posts, beams, and heavy structural timber framing.
• Snag-Free Aesthetic Finish: The smooth, domed round head provides a professional, low-profile finish without sharp edges, ensuring safety and aesthetics for fencing, outdoor furniture, and playground equipment.

Specifications

• ASIN: B0F2F6652D
• Internal SKU: IMS0858
• Size: 3/8"-16 x 3-1/2"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Round
• Package Quantity: 2