S-93604A673 3/8"-16 x 1 3/4" 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 from hot-dipped galvanized steel coating, extending service life in harsh outdoor and industrial environments.
- Enhanced load-bearing capacity with Grade 2 classification and 60,000 PSI tensile strength for reliable performance in structural applications.
- Secure anti-rotation design featuring a square neck that locks into materials, preventing spinning during nut tightening.
- Easy installation and removal with coarse 3/8"-16 UNC threading and Class 2A fit, ensuring smooth engagement even in rough conditions.
- Optimized head profile with a wide, rounded carriage head for reduced surface marring and improved aesthetic integration.
- Full regulatory compliance meeting ASTM A307, ASTM A153, and ASME B18.5 standards, plus RoHS 3 and REACH environmental directives.
- Consistent hardness and durability with Rockwell B70 rating, resisting deformation under stress in heavy-duty fastening.
Professional Applications & Engineering Value
This hot-dipped galvanized steel carriage bolt is engineered to address common industrial challenges like corrosion-induced failure and assembly inefficiency. The square neck design eliminates rotation during installation, speeding up projects in construction and automotive assembly where vibration resistance is critical. Its coarse UNC threading and Class 2A thread fit provide reliable engagement in wood, metal, and composite materials, reducing cross-threading risks. The thick zinc coating from the hot-dip process ensures long-term protection against moisture and chemicals, making it ideal for outdoor structures, machinery frames, and transportation equipment that demand corrosion-resistant fasteners with verified Grade 2 strength.
Specification Summary & Compliance
This carriage bolt maintains precise Class 2A thread tolerances per UNC standards with a 3/8"-16 thread size. Manufacturing adheres to ASTM A307 for material properties, ASTM A153 for zinc coating, and ASME B18.5 for dimensional consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for global industrial use.
