S-93548A568 1/4"-20 x 7" ASTM A307, SAE J429, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• Exceptional anti-rotation performance thanks to integrated square neck design that prevents spinning during installation
• Reliable 60,000 PSI tensile strength (Grade 2) ensures structural integrity under heavy loads and vibration
• Optimized thread engagement with UNC coarse threading and Class 2A fit for faster assembly and secure fastening
• Enhanced durability with Rockwell B70 hardness rating that resists deformation under stress
• Versatile partial threading allows for both clamping and adjustment flexibility in various applications
• Wide rounded head profile provides larger bearing surface for improved load distribution

Professional Applications & Engineering Value

This heavy-duty carriage bolt delivers exceptional engineering value through its zinc-plated steel construction and specialized square neck design, effectively solving common industrial fastening challenges. The Grade 2 strength classification with 60,000 PSI tensile strength ensures reliable performance in structural applications where vibration resistance is critical. The UNC coarse thread pattern with Class 2A fit enables quick installation while maintaining secure connections in wood-to-metal and structural steel applications. The partially threaded configuration allows for precise clamping force control, making it ideal for construction equipment, trailer assemblies, and agricultural machinery where anti-rotation features prevent loosening under dynamic loads. The combination of Rockwell B70 hardness and corrosion-resistant zinc plating ensures long-term reliability in outdoor and industrial environments.

Specification Summary & Compliance

This carriage bolt maintains precise Class 2A thread fit tolerances per UNC standards with 1/4"-20 coarse threading and right-hand thread direction. Manufacturing complies with ASTM A307, SAE J429, and ASME B18.5 specifications for dimensional accuracy and performance reliability. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety standards for industrial use.