S-93604A687 3/8"-16 x 4 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, ideal for outdoor and harsh industrial environments
• Enhanced anti-rotation performance due to the square neck design, preventing loosening under vibration and load
• High tensile strength of 60,000 PSI (Grade 2) ensures reliable load-bearing capacity for structural applications
• Excellent hardness (Rockwell B70) provides durability and resistance to wear during installation and use
• Fully threaded UNC coarse thread allows for deep penetration and secure fastening in wood and metal assemblies
• Precise Class 2A thread fit ensures smooth installation and compatibility with standard nuts
• Compliance with major standards including ASTM A307, ASTM A153, and ASME B18.5, guaranteeing quality and interchangeability

Professional Applications & Engineering Value

This hot-dipped galvanized steel carriage bolt is engineered to address critical challenges in industrial and construction settings, such as corrosion in exposed environments and vibration-induced loosening. The rounded head and square neck design work together to lock securely into materials, eliminating the need for additional washers or tools to prevent rotation during tightening. With a 3/8"-16 UNC coarse thread and fully threaded shank, it offers consistent grip strength in wood-to-metal and structural timber applications, reducing installation time and maintenance. The Grade 2 strength and robust material ensure long-term reliability in heavy-duty frameworks, trailers, and agricultural equipment, where durability and compliance with ASTM A307 and ASME B18.5 standards are paramount for safety and performance.

Specification Summary & Compliance

This carriage bolt features precise Class 2A thread fit and UNC coarse threading (3/8"-16) for consistent engagement. It meets manufacturing specifications per ASTM A307 (covering low carbon steel externally threaded fasteners), ASTM A153 (for zinc coating), and ASME B18.5 (dimensional standards). Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety regulations for industrial use.