S-93604A777 5/8"-11 x 12" 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 bolt spin during installation and use
• Reliable Grade 2 strength with 60,000 psi tensile strength and Rockwell B70 hardness for durable load-bearing applications
• Optimized thread engagement with UNC coarse threading and Class 2A fit, ensuring easy assembly and secure fastening
• Versatile partial threading allowing flexibility in clamping range while maintaining unthreaded shank strength
• Compliance with major standards including ASTM A307 and ASME B18.5, guaranteeing consistent quality and interchangeability
• Environmental regulation compliance with RoHS 3 and REACH, making them suitable for regulated industrial sectors

Professional Applications & Engineering Value

These hot-dipped galvanized steel carriage bolts are engineered to address critical challenges in structural and heavy-duty applications. The square neck design effectively prevents rotation during torque application, eliminating the need for additional locking mechanisms in wood-to-metal and timber construction. The Grade 2 strength classification with 60,000 psi tensile strength ensures reliable performance in load-bearing scenarios such as trailer assemblies, agricultural equipment, and structural framing. The UNC coarse threading provides superior resistance to vibration loosening while the partial threading configuration offers optimal stress distribution. The thick hot-dipped galvanized coating delivers exceptional corrosion protection, making these bolts ideal for outdoor infrastructure, marine environments, and industrial settings where moisture and chemical exposure are concerns.

Specification Summary & Compliance

This carriage bolt features precise Class 2A thread fit tolerances with 5/8"-11 UNC coarse threading and right-hand thread direction. Manufacturing complies with ASTM A307 specifications for carbon steel bolts and ASME B18.5 dimensional standards. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations regarding chemical safety. Additional specifications include a 1.344" head diameter, 0.344" head height, 0.64" square neck width, and minimum 6" thread length on the 12" overall bolt length.