S-93548A639 3/8"-16 x 3 3/4" 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 corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
- Exceptional mechanical strength with 60,000 PSI tensile rating and Rockwell B70 hardness for heavy-duty applications
- Secure anti-rotation performance through integrated square neck design that prevents bolt turning during installation
- Reliable coarse threading with UNC Class 2A fit for faster assembly and vibration resistance in industrial settings
- Full-length threading provides maximum grip range and installation flexibility across various material thicknesses
- Wide rounded head profile offers superior load distribution and reduced surface damage to connected materials
- Industry compliance assurance meeting multiple standards for consistent quality and performance reliability
Professional Applications & Engineering Value
This Grade 2 carriage bolt delivers critical engineering solutions for industrial assembly challenges where vibration resistance and long-term structural integrity are paramount. The zinc-plated steel construction provides essential corrosion protection for outdoor equipment, agricultural machinery, and construction applications exposed to environmental elements. The integrated square neck design fundamentally solves rotation issues during nut tightening, ensuring secure fastening in wood-to-metal and structural steel connections. With full UNC coarse threading and 60,000 PSI tensile strength, this fastener maintains clamping force under dynamic loads, making it ideal for trailer assemblies, structural frameworks, and heavy equipment where vibration-induced loosening would compromise safety and performance.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent assembly performance. Complies with ASTM A307, SAE J429 Grade 2, and ASME B18.5 specifications for material quality and dimensional accuracy. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards for use in regulated industries. Features 3/8"-16 UNC coarse threading with right-hand direction and full threading along the 3 3/4" length for versatile installation applications.
