S-93604A655 5/16"-18 x 3 1/2" ASTM A307, ASTM A153, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Exceptional corrosion protection through hot-dipped galvanized steel coating, extending service life in harsh outdoor and industrial environments
• Reliable anti-rotation performance with integrated square neck design that securely locks into materials during installation
• Superior load-bearing capacity 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 smooth installation and vibration resistance
• Enhanced durability with Rockwell B70 hardness, maintaining structural integrity under repeated stress
• Full-threaded convenience allowing maximum adjustability and secure fastening through entire bolt length
• Regulatory compliance assurance meeting multiple industry standards and environmental regulations

Professional Applications & Engineering Value

This hot-dipped galvanized steel carriage bolt delivers critical engineering solutions for structural and outdoor applications where corrosion resistance and anti-rotation capabilities are paramount. The square neck design prevents spinning during nut tightening, making it ideal for wood-to-metal connections in construction, agricultural equipment, fencing systems, and trailer manufacturing. The UNC coarse thread configuration provides excellent engagement in various materials while resisting vibration-induced loosening. With heavy-duty Grade 2 strength and complete hot-dipped galvanization, this fastener maintains integrity in moisture-prone environments where ordinary fasteners would fail, reducing maintenance frequency and replacement costs in industrial settings.

Specification Summary & Compliance

This carriage bolt features precise Class 2A thread fit tolerances and UNC coarse threading (5/16"-18) manufactured to exacting standards. The fastener complies with ASTM A307 for chemical and mechanical properties, ASTM A153 for zinc coating requirements, and ASME B18.5 for dimensional specifications. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe use across industrial markets.