S-97000A516 5/16"-18 x 1" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Exceptional Strength & Durability: With a tensile strength of 150,000 PSI and Rockwell C33 hardness, this bolt withstands extreme loads and impacts, ensuring long-term reliability in demanding applications.
• Superior Corrosion Resistance: The zinc yellow-chromate plating provides excellent protection against rust and environmental degradation, extending service life in harsh conditions.
• Secure Anti-Rotation Design: The integrated square neck prevents the bolt from spinning during installation, allowing for faster, safer, and more stable assembly.
• Optimized for Heavy-Duty Use: Meets Grade 8 and specifications ASME B18.5/SAE J429, guaranteeing consistent performance and interchangeability in industrial settings.
• Easy Installation & Reliable Grip: Fully threaded with a coarse UNC thread and Class 2A fit, enabling quick engagement and a secure hold in various materials.
• Wide Head Profile for Even Load Distribution: The 0.719" diameter rounded carriage head helps distribute clamping force evenly, reducing the risk of surface damage.

Professional Applications & Engineering Value

This Grade 8 carriage bolt is engineered to solve critical challenges in heavy machinery, structural frameworks, and transportation equipment. The zinc yellow-chromate plating combats corrosion in outdoor or high-moisture environments, while the square neck design eliminates the need for additional locking mechanisms, speeding up assembly in tight spaces. Its 150,000 PSI tensile strength and Rockwell C33 hardness ensure it can handle dynamic stresses without failure, making it ideal for securing plows, trailers, and construction attachments. The coarse UNC thread and fully threaded body provide reliable fastening in wood, metal, and composite materials, reducing the risk of loosening under vibration.

Specification Summary & Compliance

This carriage bolt adheres to precise dimensional standards, including a Class 2A thread fit for consistent engagement and a 5/16"-18 UNC coarse thread. It is manufactured in compliance with ASME B18.5 and SAE J429 specifications for Grade 8 fasteners, ensuring material integrity and performance. The product meets industry requirements for high-strength applications and is produced under quality systems that support reliability in industrial use.