S-93604A683 3/8"-16 x 3 1/2" ASTM A307, ASTM A153, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with hot-dipped galvanized steel coating for extended service life in harsh environments
• Excellent anti-rotation performance thanks to integrated square neck design that prevents spinning during installation
• Reliable mechanical strength with Grade 2 classification providing 60,000 PSI tensile strength for demanding applications
• Optimized thread engagement through UNC coarse threading and Class 2A fit ensuring secure fastening and easy assembly
• Enhanced durability with Rockwell B70 hardness maintaining structural integrity under repeated stress
• Versatile full-thread design allowing flexible positioning and consistent clamping force along the entire bolt length
• Regulatory compliance assurance meeting industry standards including RoHS 3 and REACH for safe, sustainable usage

Professional Applications & Engineering Value

These hot-dipped galvanized steel carriage bolts deliver exceptional engineering value in industrial settings where corrosion resistance and vibration resistance are critical. The square neck design eliminates the need for additional locking mechanisms by securely embedding into materials, preventing rotation during torque application and throughout service life. With UNC coarse threading and Class 2A thread fit, these fasteners provide reliable engagement in wood, metal, and composite materials while accommodating minor material variations. The fully threaded configuration offers installation flexibility across various material thicknesses, making these Grade 2 carriage bolts ideal for structural connections, machinery assembly, and outdoor infrastructure where environmental exposure demands maximum protection against rust and degradation.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance and 3/8"-16 UNC coarse thread specifications. Complies with ASTM A307 for chemical and mechanical properties, ASTM A153 for zinc coating requirements, and ASME B18.5 for dimensional standards. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for environmental safety and restricted substance control.