S-90185A107 1/4"-20 x 3 1/2" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel finish, extending service life in harsh environments
• Exceptional load-bearing capacity with Grade 5 classification and 120,000 PSI tensile strength for heavy-duty applications
• Secure anti-rotation locking through integrated square neck design that prevents spinning during installation
• Reliable coarse UNC threading with Class 2A fit for faster assembly and reduced cross-threading risk
• Optimized head design with wide rounded profile for enhanced bearing surface and reduced surface damage
• Full-thread engagement along the entire 3½" length for maximum fastening flexibility and grip strength
• Industry-standard compliance meeting ASME B18.5 and SAE J429 specifications for guaranteed interchangeability

Professional Applications & Engineering Value

This Grade 5 carriage bolt delivers critical engineering solutions for industrial applications where vibration resistance and structural integrity are paramount. The black-oxide steel construction provides essential corrosion protection for outdoor equipment, agricultural machinery, and construction assemblies exposed to environmental elements. The square neck carriage bolt design eliminates the need for additional locking washers or tools by mechanically preventing rotation during nut tightening, significantly reducing installation time in structural steel connections, trailer beds, and wooden frameworks. With its coarse UNC threading and Class 2A thread fit, this fully threaded fastener ensures rapid assembly in production environments while maintaining precise tolerances for consistent performance across multiple disassembly and reassembly cycles.

Specification Summary & Compliance

Manufactured to exacting ASME B18.5 and SAE J429 standards with Class 2A thread fit tolerances for guaranteed dimensional accuracy. The 1/4"-20 UNC coarse thread configuration ensures proper engagement in various materials. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations confirms material safety and restricted substance adherence. Heat-treated to Rockwell C25 hardness with verified 120,000 PSI tensile strength meeting Grade 5 mechanical property requirements.