S-93604A699 3/8"-16 x 8" ASTM A307, ASTM A153, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with hot-dipped galvanized steel construction, ideal for outdoor and harsh industrial environments
• Superior anti-rotation performance thanks to the integrated square neck that prevents spinning during installation
• High tensile strength of 60,000 PSI and Rockwell B70 hardness for reliable load-bearing in demanding applications
• Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring quick assembly and vibration resistance
• Versatile partial threading design with 6" minimum thread length providing flexibility for various material thicknesses
• Enhanced durability meeting Grade 2 standards for consistent performance in structural and heavy-duty fastening
• Regulatory compliance assurance with RoHS 3 and REACH, making it suitable for global industrial supply chains

Professional Applications & Engineering Value

This hot-dipped galvanized steel carriage bolt is engineered to address common industrial challenges such as corrosion-induced failure and installation inefficiency. The square neck design securely locks into materials, eliminating rotation during tightening—critical for wood-to-metal connections in construction, agricultural equipment, and transportation infrastructure. The UNC coarse thread and Class 2A thread fit facilitate faster assembly in coarse-grained materials while maintaining grip under dynamic loads. With a 60,000 PSI tensile strength and Rockwell B70 hardness, it withstands shear and tensile stresses in framing, trailer assemblies, and machinery bases. The hot-dipped galvanized coating provides a robust barrier against moisture and chemicals, extending service life in outdoor or corrosive settings without compromising mechanical integrity.

Specification Summary & Compliance

This carriage bolt features a 3/8"-16 UNC coarse thread with Class 2A thread fit for standard dimensional accuracy and ease of assembly. It complies with ASTM A307 for low-carbon steel bolts, ASTM A153 for zinc coating (hot-dip), and ASME B18.5 for dimensional standards. Environmental and safety adherence includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring suitability for regulated industrial markets.