S-93548A851 5/8"-11 x 12" ASTM A307, SAE J429, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance with a square neck design that prevents the bolt from turning during installation and use, ensuring reliable fastening in high-vibration environments.
• Enhanced corrosion resistance thanks to the zinc-plated steel construction, extending the bolt's service life in harsh industrial or outdoor settings.
• High tensile strength of 60,000 psi and Grade 2 classification, providing dependable load-bearing capacity for heavy-duty structural and machinery applications.
• Optimized thread engagement with UNC coarse threading and Class 2A fit, allowing for faster assembly and reduced risk of cross-threading in wood or metal components.
• Excellent durability backed by Rockwell B70 hardness, resisting deformation under stress and maintaining integrity in demanding conditions.
• Secure head retention due to the rounded carriage head and wide profile, which distributes pressure evenly and minimizes surface damage.
• Regulatory compliance assurance with RoHS 3 and REACH standards, ensuring safe and environmentally responsible use across global markets.

Professional Applications & Engineering Value

This zinc-plated steel carriage bolt is engineered to address common challenges in industrial fastening, such as rotational slippage and corrosion-induced failure. The square neck design locks securely into materials, preventing spin-out during torque application—ideal for wood-to-metal connections in construction, agricultural equipment, and trailer assemblies. Its partially threaded shank and UNC coarse threads facilitate quick installation in soft materials, while the Grade 2 strength and 60,000 psi tensile rating ensure it withstands dynamic loads without shearing. The zinc plating adds a protective barrier against moisture and chemicals, making it suitable for outdoor machinery, fencing, and structural frameworks where longevity and anti-rotation performance are critical.

Specification Summary & Compliance

This carriage bolt adheres to precise dimensional standards, including a Class 2A thread fit for consistent engagement and UNC coarse threading (5/8"-11). It meets key industry specifications such as ASTM A307, SAE J429, and ASME B18.5, ensuring interoperability and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing the absence of restricted hazardous substances for safe industrial use.