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

Substantial Support for Structural Timber Connections
The IMSCREWS 3/8" x 3-1/2" carriage bolt is designed for projects requiring deep penetration and stable structural support. With 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 framing, they offer the stability necessary for long-term use in gazebos, pergolas, and industrial garden structures.

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.

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

• PREMIUM 304 STAINLESS STEEL Crafted from high-quality 18-8 (304) stainless steel, these carriage bolts offer superior rust and corrosion resistance. Ideal for long-term outdoor, garden, and marine applications.
• INDUSTRIAL STRENGTH 3/8 DIAMETER With a robust 3/8-inch large diameter, these bolts provide massive shear strength and loading capacity. Engineered for structural projects where safety is paramount.
• ADJUSTABLE FULL THREAD DESIGN The 3-1/2 length features a full thread design, providing maximum versatility for various material thicknesses. It ensures a secure, tight fit without the limitation of a smooth shank.
• SELF-LOCKING SQUARE NECK Features a precision square neck that bites into wood to prevent spinning. This allows for easy one-sided tightening during installation, making it ideal for large-scale timber framing.
• SPECIFICATIONS & NOTE Package includes 5 pieces of 3/8-16 x 3-1/2 carriage bolts only. Nuts and washers are NOT included. We recommend pre-drilling a 3/8 hole for a professional fit.

Specifications

• ASIN: B0F2F6JR9S
• Internal SKU: IMS0859
• Size: 3/8"-16 x 3-1/2"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Round
• Package Quantity: 5