S-90185A630 3/8"-16 x 1 3/4" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through zinc-plated steel construction, extending service life in harsh environments
• Secure anti-rotation locking with integrated square neck design that prevents spinning during installation
• Optimized thread engagement through full UNC coarse threading for faster assembly and reduced cross-threading risk
• Consistent mechanical properties with Rockwell C25 hardness ensuring dimensional stability under stress
• Enhanced installation efficiency with rounded carriage head profile allowing for easier wrench access
• Proven reliability meeting Grade 5 specifications for medium-strength industrial applications

Professional Applications & Engineering Value

This Grade 5 carriage bolt delivers critical engineering solutions for structural connections requiring both strength and security. The zinc-plated steel construction provides essential corrosion protection for outdoor equipment, agricultural machinery, and construction applications where environmental exposure is a concern. The integrated square neck design eliminates the need for additional locking mechanisms by positively engaging with mounting surfaces, preventing rotation during torque application. The fully threaded UNC coarse thread configuration ensures rapid installation in wood-to-metal and structural steel applications, while the rounded carriage head offers a finished appearance and reduces snagging hazards. These features combine to create a versatile fastening solution that addresses common installation challenges in industrial assembly and maintenance operations.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent mating with nuts and threaded components. The 3/8"-16 UNC coarse thread follows standardized threading specifications for reliable compatibility. Compliance with ASME B18.5 and SAE J429 standards ensures consistent quality and performance characteristics. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, confirming the absence of restricted substances for global industrial use.