S-93604A659 5/16"-18 x 4 1/2" 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
• High tensile strength rating of 60,000 PSI Grade 2 classification ensures reliable load-bearing capacity
• Optimized thread engagement with UNC coarse threading and Class 2A fit for faster assembly and secure fastening
• Full threading capability allows for maximum adjustability and versatile application across various material thicknesses
• Enhanced durability with Rockwell B70 hardness providing excellent resistance to deformation under stress
• Regulatory compliance meets multiple industry standards including ASTM A307, ASTM A153, and ASME B18.5

Professional Applications & Engineering Value

This hot-dipped galvanized steel carriage bolt delivers exceptional engineering value for industrial and construction applications where corrosion resistance and structural integrity are paramount. The Grade 2 classification with 60,000 PSI tensile strength ensures reliable performance in structural connections, while the square neck design provides critical anti-rotation capability that prevents loosening in vibrating environments. The fully threaded UNC coarse thread configuration allows for superior grip and faster installation in wood-to-metal and structural steel applications. The hot-dipped galvanized coating offers superior protection against rust and corrosion, making these 5/16"-18 carriage bolts ideal for outdoor structures, agricultural equipment, marine environments, and industrial machinery where exposure to moisture and chemicals is common.

Specification Summary & Compliance

This 4-1/2" carriage bolt features precise Class 2A thread fit with 5/16"-18 UNC coarse threading and right-hand thread direction. Manufactured to exacting standards including ASTM A307 for low carbon steel fasteners, ASTM A153 for zinc coating (hot-dip), and ASME B18.5 for dimensional requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial applications.