S-93604A651 5/16"-18 x 2 1/2" ASTM A307, ASTM A153, ASME B18.5 Carriage Bolts
Carriage Bolts
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Basic Information
Head Parameters
Neck & Shank Parameters
Dimension Parameters
Thread Parameters
Material & Strength Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Superior corrosion resistance with hot-dipped galvanized steel coating, ideal for outdoor and marine environments
- Enhanced anti-rotation performance due to the integrated square neck design, preventing loosening under vibration
- High tensile strength of 60,000 PSI (Grade 2) ensures reliable load-bearing capacity for heavy-duty applications
- Coarse UNC threading allows for quick and easy installation, reducing assembly time
- Class 2A thread fit provides consistent engagement and smooth fastening with standard nuts
- Rockwell B70 hardness offers excellent durability and resistance to wear in demanding conditions
- Full compliance with ASTM A307, ASTM A153, and ASME B18.5 guarantees quality and interchangeability
Professional Applications & Engineering Value
This hot-dipped galvanized steel carriage bolt is engineered to address common industrial challenges such as corrosion, vibration-induced loosening, and high-stress demands. The square neck securely locks into materials, preventing rotation during tightening and in dynamic environments, while the coarse UNC thread (5/16"-18) ensures rapid installation in wood, metal, and structural assemblies. With a Grade 2 strength rating and robust Rockwell B70 hardness, it delivers reliable performance in construction, marine, and heavy machinery applications, reducing maintenance needs and enhancing project longevity. The fully threaded design and right-hand threading further simplify use across diverse fastening scenarios, making it a versatile choice for engineers and contractors.
Specification Summary & Compliance
This carriage bolt features precise dimensions, including a 2-1/2" length, 5/16"-18 UNC coarse thread with Class 2A fit for consistent tolerance. It complies with ASTM A307 for structural bolts, ASTM A153 for zinc coating, and ASME B18.5 for dimensional standards, ensuring reliability and interchangeability. Additionally, it is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety regulations for industrial use.
