S-93604A625 1/4"-20 x 3" 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 harsh industrial environments
- High tensile strength of 60,000 PSI (Grade 2) ensures reliable performance in demanding structural and machinery applications
- Square neck design prevents rotation during installation, providing secure fastening without the need for additional tools
- Fully threaded UNC coarse thread pattern allows for deep engagement and quick assembly in wood and metal applications
- Class 2A thread fit guarantees consistent, easy installation with standard nuts and tools
- Rockwell B70 hardness offers excellent durability and resistance to wear under load
- Compliance with ASTM A307, ASTM A153, and ASME B18.5 standards ensures quality and reliability for professional use
Professional Applications & Engineering Value
This hot-dipped galvanized steel carriage bolt is engineered to address common industrial challenges such as corrosion, vibration loosening, and structural integrity. The 1/4"-20 UNC coarse threading and fully threaded design enable secure fastening in wood-to-metal connections, construction frameworks, and agricultural equipment, where moisture and stress are prevalent. The square neck locks into materials to prevent spinning during tightening, reducing installation time and improving safety. With a Grade 2 strength rating and robust Rockwell B70 hardness, it withstands heavy loads and environmental exposure, making it ideal for bridges, trailers, and machinery assemblies that require long-term reliability without frequent maintenance.
Specification Summary & Compliance
This carriage bolt features precise Class 2A thread fit and adheres to UNC coarse thread standards for consistent performance. It meets manufacturing specifications including ASTM A307 for low-carbon steel bolts, ASTM A153 for zinc coating, and ASME B18.5 for dimensional accuracy. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial markets.
