S-93548A646 3/8"-16 x 5 1/2" ASTM A307, SAE J429, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• Enhanced anti-rotation performance through integrated square neck design that prevents spinning during installation
• Heavy-duty load capacity with 60,000 PSI tensile strength and Grade 2 classification for reliable structural connections
• Optimized thread engagement with UNC coarse threading and Class 2A fit for faster assembly and secure fastening
• Wide bearing surface from the rounded carriage head design that distributes pressure and minimizes surface damage
• Full-threaded convenience allowing installation at any point along the 5-1/2" length for versatile positioning
• Industry compliance assurance meeting ASTM A307, SAE J429, and ASME B18.5 standards for quality and reliability

Professional Applications & Engineering Value

These Grade 2 zinc-plated steel carriage bolts deliver exceptional engineering value in heavy-duty construction and industrial applications where vibration resistance and structural integrity are paramount. The combination of Rockwell B70 hardness and 60,000 PSI tensile strength ensures reliable performance in wood-to-metal connections, structural framing, and equipment assembly. The square neck design provides critical anti-rotation capability that prevents loosening under dynamic loads, while the zinc plating offers essential corrosion protection for both indoor and outdoor environments. The UNC coarse thread configuration enables quicker installation in wood, steel, and composite materials, making these fully threaded carriage bolts ideal for construction projects, agricultural equipment, and industrial machinery where durability and compliance with industry standards are non-negotiable.

Specification Summary & Compliance

This 3/8"-16 x 5-1/2" carriage bolt features Class 2A thread fit tolerance with UNC coarse thread spacing, ensuring precise dimensional accuracy according to ASME B18.5 specifications. Manufactured from zinc-plated steel with Rockwell B70 hardness, the fastener meets ASTM A307 and SAE J429 Grade 2 requirements for mechanical properties and performance. The product is fully RoHS 3 (2015/863/EU) Compliant, confirming adherence to environmental regulations while maintaining the specified 60,000 PSI tensile strength for reliable industrial performance.