IMSCREWS 3/8"-16 x 1-3/4" Heavy-Duty 304 Stainless Steel Carriage Bolts (20 PCS)

Substantial Strength for 2x Lumber and Marine Construction
The IMSCREWS 3/8" x 1-3/4" carriage bolt is engineered for heavy-duty structural projects requiring maximum load-bearing capacity and a professional finish. With a robust 3/8-inch diameter and a precise 1.75-inch length, these bolts are the ideal choice for securing standard 2x lumber (actual 1.5" thickness) used in decks, docks, and residential framing. The length is perfectly calculated to provide a snug connection, allowing enough thread clearance for a flat washer and hex nut without excessive protrusion. Built for durability, they offer the structural stability required for pergolas, heavy-duty outdoor furniture, and marine hardware.

Superior Durability and Safety-Focused Design
Forged from premium 18-8 (304) stainless steel, these fasteners offer superior resistance to rust and corrosion, even when exposed to harsh outdoor or humid environments. The smooth round head creates a clean, tamper-resistant look that reduces snagging hazards, making them a safe choice for high-traffic areas like boardwalks, playground equipment, and residential decks. The integrated square neck locks the bolt into place, preventing spinning and allowing for easy, one-sided tightening from the nut side with a single wrench.

Specifications:
- Thread Size: 3/8"-16 Coarse (UNC); Length: 1-3/4" (Measured from Under Head)
- Material: 304 (18-8) Stainless Steel; Full Thread

Pro-Tips:
1. Use a 3/8" 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 heavy structural loads and protect wood fibers.

Key Features

• Industrial 3/8 Shank Strength: The reinforced 3/8-inch diameter provides a significant boost in shear resistance over smaller bolts, making it the standard for load-bearing joints in deck framing and heavy timber construction.
• Precision 1.75 Length: Specifically sized to through-bolt standard 2x lumber (1.5 actual) with the Designed for clearance for a flat washer, lock washer, and hex nut¡ªeliminating dangerous thread protrusion.
• Marine-Grade 304 Stainless: Crafted from 18-8 (304) stainless steel for superior rust protection. Ideal for use with ACQ pressure-treated wood and exposure to rain, snow, and freshwater environments.
• Tamper-Resistant Safety Head: The smooth, drive-free round head offers a clean, snag-free finish¡ªessential for playground equipment, public benches, and child-safe deck railings.
• Self-Locking Square Neck: The precision square shoulder bites deep into wood fibers, locking the bolt firmly in place to allow for easy, one-handed tightening from the nut side.

Specifications

• ASIN: B0F2F67NJD
• Internal SKU: IMS0842
• Size: 3/8"-16 x 1-3/4"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Round
• Package Quantity: 20