S-93548A552 1/4"-20 x 2 1/2" ASTM A307, SAE J429, 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 Anti-Rotation Performance with integrated square neck design that locks securely into materials, preventing bolt spin during installation and use.
- Enhanced Corrosion Resistance from zinc-plated steel coating, extending service life in demanding environments like construction and outdoor applications.
- High Tensile Strength & Reliability with Grade 2 classification and 60,000 psi tensile strength, ensuring dependable fastening under heavy loads.
- Optimized Thread Engagement featuring coarse UNC 1/4"-20 threads and Class 2A fit for quick assembly and reduced cross-threading risks.
- Exceptional Durability backed by Rockwell B70 hardness, providing resistance to wear and deformation in high-stress applications.
- Wide Application Compatibility due to fully threaded right-hand design and rounded carriage head, suitable for wood, metal, and composite materials.
- Regulatory Compliance Assurance meeting ASTM A307, SAE J429, and ASME B18.5 standards, plus RoHS 3 environmental regulations for safe usage.
Professional Applications & Engineering Value
This 1/4"-20 carriage bolt is engineered to address critical fastening challenges in construction, automotive, and industrial settings. The zinc-plated steel construction combats corrosion, while the square neck design eliminates rotation during torque application—saving installation time and preventing joint failure. With coarse UNC threads and Class 2A thread fit, it ensures rapid assembly and reliable grip in wood-to-metal and structural applications. The Grade 2 strength rating and 60,000 psi tensile strength provide a safety margin for dynamic loads, making it ideal for trailer assemblies, framing, and machinery where vibration resistance is paramount.
Specification Summary & Compliance
This carriage bolt features a 1/4"-20 UNC coarse thread with Class 2A tolerance for consistent fit. It complies with ASTM A307 for low-carbon steel bolts, SAE J429 for Grade 2 mechanical properties, and ASME B18.5 for dimensional standards. The product is RoHS 3 (2015/863/EU) Compliant, ensuring adherence to environmental regulations for hazardous substance restrictions.
