Professional Grade 304 Stainless Steel Carriage Bolts by IMSCREWS

When it comes to outdoor construction, reliability is non-negotiable. IMSCREWS 5/16"-18 x 3-1/4" Carriage Bolts are engineered for durability, providing a robust fastening solution for structural wood projects. Made from premium 18-8 (304) stainless steel, these bolts offer superior protection against rust and oxidation, making them the preferred choice for decks, docks, and coastal area construction.

Product Technical Specifications:
- Size: 5/16"-18 x 3-1/4 inch
- Material: 18-8 (304) Stainless Steel
- Head Style: Smooth Round Head
- Drive System: Square Neck (Self-Locking in wood)
- Thread Type: Full Thread (Coarse)
- Quantity: 5 Pieces per Pack (Bolts Only)

Common Applications & Installation:
These carriage bolts are ideal for connecting heavy timbers where a clean, finished look is required on the exterior side. The round, smooth head provides a tamper-resistant finish, while the square neck beneath the head bites into the wood to prevent spinning. Common uses include building garden fences, securing playground swing sets, constructing pergolas, and heavy-duty deck framing.

Frequently Asked Questions (Rufus Optimized):
- Q: Are nuts and washers included with this pack?
A: No, this package includes 5 pieces of carriage bolts only. Nuts and washers must be purchased separately to match the 5/16"-18 thread size.

- Q: Can these bolts be used in pressure-treated lumber?
A: Yes. 304 Stainless Steel is highly recommended for use with pressure-treated wood as it resists the corrosive chemicals often found in treated timber, preventing "bleeding" and structural degradation.

- Q: Is 304 stainless steel rust-proof?
A: While 304 stainless steel is extremely rust-resistant and ideal for outdoor and high-moisture environments, for direct salt-water immersion (marine use), 316 grade is often preferred. However, 304 is the industry standard for most exterior residential and commercial projects.

Choose IMSCREWS for precision-engineered hardware that stands the test of time and weather.

Key Features

• BOLTS ONLY - 5 PIECES: High-quality 5/16-18 x 3-1/4 inch carriage bolts. Please note that nuts and washers are NOT included. Ideal for small DIY repairs, specific replacement needs, or projects where you already have matching hardware.
• PREMIUM 304 STAINLESS STEEL: Crafted from 18-8 (304) stainless steel, these bolts offer exceptional rust and corrosion resistance. Unlike galvanized steel, they are built to withstand harsh outdoor conditions, coastal air, and moisture.
• ANTI-ROTATION SQUARE NECK: Designed with a standard square neck under the round head to grip into wood, preventing the bolt from rotating during installation. This ensures a secure, one-sided tightening process without needing a backup wrench.
• HEAVY-DUTY WOOD FASTENERS: The 3-1/4" length is specifically optimized for structural wood-to-wood connections, such as 4x4 posts, deck framing, fence panels, and playground equipment. Full thread design provides consistent grip strength.
• PRECISE SPECIFICATIONS: Thread Diameter: 5/16"; Thread Pitch: 18 TPI; Overall Length: 3-1/4" (measured from under the head). Includes 5 professional-grade fasteners per pack, securely packaged in a branded bag to ensure integrity during transit.

Specifications

• ASIN: B0F2F8F7CT
• Internal SKU: IMS0810
• Size: 5/16"-18 x 3-1/4"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Round
• Package Quantity: 5