S-90185A261 5/8"-11 x 8" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity - Grade 5 classification with 120,000 psi tensile strength ensures reliable performance in high-stress industrial applications
• Superior Corrosion Protection - Zinc-plated steel construction provides durable resistance against environmental elements and extends service life
• Secure Anti-Rotation Design - Square neck profile prevents bolt spinning during installation, enabling faster and more stable assembly
• Optimized Thread Engagement - Fully threaded UNC coarse 5/8"-11 configuration with Class 3A fit guarantees precise mating and vibration resistance
• Enhanced Material Durability - Rockwell C25 hardness maintains structural integrity under repeated loading and mechanical stress
• Industry-Standard Compliance - Meets ASME B18.5 specifications for consistent quality and interchangeability across applications
• Versatile Head Design - Rounded carriage head with wide profile distributes clamping force evenly while providing a finished appearance

Professional Applications & Engineering Value

This Grade 5 carriage bolt delivers critical engineering solutions for heavy-duty fastening requirements across construction, industrial machinery, and structural applications. The zinc-plated steel construction combats corrosion in demanding environments, while the square neck design eliminates rotation during torque application - significantly reducing installation time and improving joint security. The fully threaded UNC coarse thread configuration ensures maximum thread engagement throughout the 8" length, providing superior load distribution in thick materials. With 120,000 psi tensile strength and Rockwell C25 hardness, this fastener maintains clamping force under extreme vibration and dynamic loads, making it ideal for structural connections, equipment frames, and timber construction where reliability is paramount.

Specification Summary & Compliance

This carriage bolt features precision UNC 5/8"-11 coarse threads with Class 3A fit for optimal thread engagement and tolerance. Manufactured to ASME B18.5 standards and meeting SAE J429 Grade 5 requirements for consistent dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.