S-97000A515 5/16"-18 x 3/4" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Maximum Load Capacity - Grade 8 classification and 150,000 psi tensile strength ensure reliable performance in high-stress applications
• Superior Anti-Rotation Security - Square neck design prevents spinning during installation and maintains permanent positioning
• Enhanced Corrosion Protection - Zinc yellow-chromate plating provides durable resistance against rust and environmental elements
• Optimized Thread Engagement - UNC coarse threading with Class 2A fit ensures smooth installation and secure fastening
• Exceptional Material Durability - Rockwell C33 hardness maintains structural integrity under repeated stress and vibration
• Industry-Standard Compliance - Meets ASME B18.5 and SAE J429 specifications for guaranteed quality and interoperability
• Versatile Head Design - Rounded carriage head with wide profile distributes load evenly and provides clean finished appearance

Professional Applications & Engineering Value

This Grade 8 carriage bolt delivers critical engineering solutions for industrial applications where vibration resistance and structural integrity are paramount. The square neck design effectively prevents rotation during torque application, making it ideal for wood-to-metal connections, structural framing, and heavy equipment assembly. The zinc yellow-chromate plating on steel construction provides superior corrosion protection in demanding environments, while the UNC coarse threading ensures rapid installation and reliable performance in high-vibration scenarios. With its 150,000 psi tensile strength and Rockwell C33 hardness, this fastener maintains clamping force under extreme conditions, preventing joint failure in construction, transportation, and machinery applications where safety and durability are non-negotiable.

Specification Summary & Compliance

This heavy-duty carriage bolt features precision 5/16"-18 UNC coarse threading with Class 2A tolerance for consistent fit and performance. Manufactured to exacting ASME B18.5 and SAE J429 specifications, ensuring dimensional accuracy and mechanical properties. The zinc yellow-chromate plating provides corrosion resistance while maintaining compliance with industrial standards. With complete threading and right-hand direction, this fastener delivers reliable performance in demanding applications where quality and specification adherence are critical.