S-93604A685 3/8"-16 x 4" ASTM A307, ASTM A153, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with hot-dipped galvanized steel coating for long-lasting performance in harsh environments
• Superior anti-rotation security thanks to the square neck design that prevents spinning during installation
• Reliable mechanical strength with Grade 2 classification and 60,000 psi tensile strength for demanding applications
• Optimized thread engagement through UNC coarse threading and Class 2A fit for faster assembly and secure fastening
• Enhanced durability with Rockwell B70 hardness that maintains structural integrity under stress
• Wide compatibility with rounded carriage head profile accommodating various industrial and construction requirements
• Full regulatory compliance meeting ASTM, ASME, RoHS 3 and REACH standards for quality assurance

Professional Applications & Engineering Value

These hot-dipped galvanized steel carriage bolts deliver exceptional engineering value for industrial and construction applications where corrosion resistance and vibration-proof performance are critical. The square neck design effectively prevents rotation during torque application, making them ideal for wood-to-metal connections, structural framing, and heavy equipment assembly. The Grade 2 classification with 60,000 psi tensile strength ensures reliable performance in load-bearing applications, while the UNC coarse threading provides superior grip in softer materials and faster installation. The hot-dipped galvanized coating offers robust protection against rust and environmental degradation, extending service life in outdoor and high-moisture environments. These carriage bolts are engineered to maintain clamping force under vibration, making them perfect for construction, agricultural equipment, and infrastructure projects requiring durable fastening solutions.

Specification Summary & Compliance

This 3/8"-16 carriage bolt features precise Class 2A thread fit with UNC coarse threading and right-hand direction. Manufactured to exacting standards including ASTM A307, ASTM A153, and ASME B18.5 specifications. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The fastener maintains dimensional accuracy with 4" length, 0.375" diameter, and square neck measuring 0.39" width by 0.22" length for secure anti-rotation performance.