S-90185A171 5/16"-18 x 1 1/2" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-flake coating that provides excellent protection in harsh industrial environments
• High tensile strength of 120,000 psi ensures reliable performance in demanding applications requiring Grade 5 strength classification
• Secure anti-rotation design featuring a square neck that prevents spinning during installation and maintains positioning
• Optimized thread engagement with full UNC coarse threading for faster installation and superior holding power
• Precision manufacturing with Class 2A thread fit ensuring consistent performance and easy assembly
• Enhanced durability backed by Rockwell C25 hardness for long service life under heavy loads
• Regulatory compliance meeting ASME B18.5, RoHS 3, and REACH standards for global industrial applications

Professional Applications & Engineering Value

This Grade 5 carriage bolt delivers exceptional engineering value through its zinc-flake coated steel construction and square neck design, specifically engineered to solve common industrial fastening challenges. The combination of 120,000 psi tensile strength and Rockwell C25 hardness ensures reliable performance in structural applications, agricultural equipment, and heavy machinery where vibration resistance is critical. The fully threaded UNC coarse pattern provides superior grip in wood-to-metal and structural steel connections, while the rounded carriage head offers a finished appearance and prevents snagging. These industrial fasteners are particularly valuable in applications requiring both high strength and corrosion protection, making them ideal for outdoor equipment, trailer manufacturing, and construction projects where durability and regulatory compliance are paramount.

Specification Summary & Compliance

This carriage bolt maintains Class 2A thread fit tolerance with 5/16"-18 UNC coarse threading and right-hand thread direction, manufactured to ASME B18.5 specifications SAE J429. The fastener meets Grade 5 strength classification with verified 120,000 psi tensile strength and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe use across global industrial markets.