IMSCREWS 1/4"-20 x 3-3/4" Extra-Long 304 Stainless Steel Carriage Bolts (5 PCS)

Substantial Strength for 4x4 Post and Structural Timber Connections
The IMSCREWS 1/4" x 3-3/4" carriage bolt is engineered for structural projects requiring reliable penetration through thick materials. With a standard 1/4-inch diameter and a specific 3.75-inch length, these bolts are the ideal choice for securing standard 4x4 timber posts (actual 3.5"). They provide the necessary reach to fully penetrate the wood while leaving a precision amount of thread to accommodate washers and nuts for a snug, permanent connection. Built for durability, they offer the stability required for outdoor structures, deck framing, and landscape timber 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, low-profile appearance that reduces snagging hazards, making them a safe choice for railings, play sets, and benches. The integrated square neck prevents the bolt from spinning during installation, allowing for easy, one-sided fastening with a single wrench from the nut side.

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

Pro-Tips:
1. Use a 1/4" drill bit to ensure a snug, structural fit for the square neck.
2. Pair with stainless steel flat washers and hex nuts on the nut side to distribute structural load and protect wood fibers.

Key Features

• Extra-Long Structural Reach: The 3.75-inch length is custom-engineered for through-bolting thick 4x4 structural posts and multi-layer timber beams with precision and ease.
• Full-Thread Clamping Power: Featuring a precision-cut 1/4-20 full thread, these bolts ensure consistent tension and a gap-free connection across the entire 3.75 span.
• Outdoor-Ready 304 Stainless: Forged from 18-8 (304) stainless steel to endure harsh weather. Essential for ACQ pressure-treated lumber used in modern garden projects.
• Snag-Free Safety Head: The low-profile domed head provides a smooth finish without sharp edges¡ªWell-suited for child-friendly play sets, porch swings, and benches.
• Self-Seating Square Neck: The precision square shoulder bites firmly into wood fibers, locking the bolt in place for effortless, one-handed tightening from the nut side.

Specifications

• ASIN: B0F2F2RMV8
• Internal SKU: IMS0759
• Size: 1/4"-20 x 3-3/4"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Round
• Package Quantity: 5