S-90185A130 3/8"-16 x 6" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Enhanced load-bearing capacity with Grade 5 classification and 120,000 psi tensile strength for demanding industrial applications
• Superior corrosion resistance through black-oxide steel construction, extending service life in harsh environments
• Secure anti-rotation performance with integrated square neck design that prevents spinning during installation
• Optimized thread engagement through UNC coarse threading and Class 2A fit for faster assembly and vibration resistance
• Wide-bearing surface distribution from the rounded carriage head design, reducing surface pressure and material damage
• Full-threaded convenience allowing installation at any point along the 6" length for versatile positioning
• Regulatory compliance assurance meeting ASME B18.5 specifications and environmental standards including RoHS 3 & REACH

Professional Applications & Engineering Value

This black-oxide steel carriage bolt delivers exceptional engineering value for structural applications where vibration resistance and long-term reliability are critical. The square neck carriage bolt design eliminates rotation during tightening, making it ideal for wood-to-metal connections in trailer manufacturing, agricultural equipment, and construction frameworks. The UNC coarse thread configuration ensures rapid installation in soft materials while maintaining Grade 5 tensile strength under dynamic loads. The black-oxide finish provides superior corrosion protection compared to plain steel, extending service life in outdoor and industrial environments where moisture and chemicals are present. With full threading along the entire 6" length, this fastener offers installation flexibility for varying material thicknesses without compromising fastener integrity.

Specification Summary & Compliance

This carriage bolt maintains Class 2A thread fit tolerance with 3/8"-16 UNC coarse thread specifications and meets ASME B18.5 dimensional requirements. Manufacturing complies with SAE J429 Grade 5 standards, ensuring consistent 120,000 psi tensile strength and Rockwell C25 hardness. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming adherence to international environmental regulations for industrial fasteners.