S-90185A117 5/16"-18 x 3 1/2" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with Grade 5 classification and 120,000 psi tensile strength for reliable performance in demanding applications
• Superior anti-rotation security through square neck design that prevents spinning during installation and vibration
• Enhanced corrosion resistance with black-oxide steel finish providing durable protection in industrial environments
• Optimized thread engagement with full UNC coarse threading and Class 2A fit ensuring smooth installation and secure fastening
• Wide head distribution with rounded carriage profile that minimizes surface damage while providing excellent clamping force
• Consistent hardness performance at Rockwell C25 for maintained structural integrity under repeated stress
• Regulatory compliance assurance meeting ASME B18.5 specifications for dimensional accuracy and material standards

Professional Applications & Engineering Value

These Grade 5 carriage bolts deliver critical engineering solutions where vibration resistance and structural integrity are paramount. The black-oxide steel construction combined with the square neck design addresses common industrial challenges of fastener loosening and material degradation. The fully threaded UNC coarse thread pattern ensures rapid installation in wood-to-metal applications, construction frameworks, and heavy equipment assemblies. With 120,000 psi tensile strength and proper Class 2A thread fit, these bolts maintain clamping force in high-vibration environments while the rounded head profile prevents surface marring. Ideal for structural connections in agricultural machinery, trailer manufacturing, and industrial platforms where reliable, non-rotating fasteners are essential for safety and longevity.

Specification Summary & Compliance

This 5/16"-18 carriage bolt features precise Class 2A thread fit tolerances and UNC coarse threading manufactured to ASME B18.5 dimensional standards. The fastener meets Grade 5 mechanical properties with verified 120,000 psi tensile strength and Rockwell C25 hardness. Compliance certifications include RoHS 3 (2015/863/EU) for restricted substance control and REACH (EC 1907/2006) for chemical safety, ensuring environmental regulatory adherence for industrial distribution and use.