S-93548A831 5/8"-11 x 8" ASTM A307, SAE J429, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc-plated steel construction for long-lasting performance in demanding environments.
• Superior anti-rotation security due to the integrated square neck that prevents spinning during installation and under load.
• High tensile strength of 60,000 psi ensures reliable load-bearing capacity for heavy-duty structural and industrial applications.
• Secure coarse UNC threading provides excellent grip and faster assembly in wood, metal, and other coarse-thread compatible materials.
• Optimized hardness (Rockwell B70) offers excellent durability and resistance to wear and deformation under stress.
• Wide, rounded carriage head distributes clamping force evenly and sits flush for a clean, finished appearance.
• Comprehensive compliance with ASTM A307, SAE J429, and ASME B18.5 standards guarantees consistent quality and engineering reliability.

Professional Applications & Engineering Value

This 5/8"-11 x 8" zinc-plated steel carriage bolt is engineered to address common industrial challenges such as joint loosening and material degradation. The square neck design is critical for preventing rotation in wood-to-metal and structural timber connections, eliminating the need for additional locking mechanisms. Its Grade 2 classification and 60,000 psi tensile strength make it ideal for heavy-duty frameworks, trailer construction, agricultural equipment, and machinery assembly where vibration resistance is essential. The zinc plating provides a protective barrier against rust and corrosion, extending service life in outdoor or high-moisture environments. With UNC coarse threading and partial threading, it ensures quick installation and secure fastening in coarse-grained materials, reducing assembly time while maintaining structural integrity.

Specification Summary & Compliance

This carriage bolt features a 5/8"-11 UNC coarse thread with Class 2A fit for standard tolerance applications. It is manufactured in accordance with ASTM A307, SAE J429 Grade 2, and ASME B18.5 specifications, ensuring dimensional accuracy and mechanical performance. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.