IMSCREWS 1/4"-20 x 3-1/2" 304 Stainless Steel Carriage Bolts (20 PCS)

Reliable Support for Long-Reach Timber Connections
The IMSCREWS 1/4" x 3.5" carriage bolt is engineered for projects requiring deep penetration and stable structural support in a versatile diameter. 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 railings. Built for durability, they offer the stability necessary for long-term use in gazebos, garden gates, and outdoor furniture assembly.

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 high-traffic areas like benches, play sets, and railings. The integrated square neck prevents rotation, allowing for easy, one-sided installation with a single wrench from the nut side.

Specifications:
- Thread: 1/4"-20 Coarse; Length: 3-1/2" (Under Head)
- Material: 304 (18-8) Stainless Steel; Full Thread

FAQ:
Q: Drill bit size? A: A 1/4" 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 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.
• ADJUSTABLE FULL THREAD DESIGN The 3.5-inch 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-engineered square neck that bites into wood to prevent spinning. This allows for easy one-sided tightening during installation, making it Well-suited for DIY projects.
• SMOOTH SAFETY FINISH The rounded mushroom head provides a clean, professional appearance without sharp edges. Ideal for furniture, playgrounds, and public fixtures where a snag-free finish is essential.
• SPECIFICATIONS & NOTE Package includes 20 pieces of 1/4-20 x 3-1/2 carriage bolts only. Nuts and washers are NOT included. We recommend pre-drilling a 1/4 hole for a professional fit.

Specifications

• ASIN: B0F2F47J89
• Internal SKU: IMS0758
• Size: 1/4"-20 x 3-1/2"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Round
• Package Quantity: 20