S-97000A518 5/16"-18 x 1 1/2" 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, preventing fastener failure under extreme conditions.
• Superior Corrosion Protection: Zinc yellow-chromate plating provides excellent resistance to rust and environmental degradation, extending service life in harsh industrial or outdoor settings.
• Anti-Rotation Security: Integrated square neck design locks securely into materials during installation, preventing spinning and ensuring proper alignment without additional tools.
• Optimized Thread Engagement: Coarse UNC threads with Class 2A fit facilitate quicker installation and superior grip in various materials, reducing assembly time.
• Enhanced Durability: Rockwell C33 hardness offers exceptional wear resistance and structural integrity, maintaining performance through repeated use and vibration.
• Industry Compliance: Meets ASME B18.5 and SAE J429 specifications, guaranteeing consistent quality and compatibility with standardized industrial requirements.
• Versatile Sizing: 5/16"-18 thread size and 1-1/2" length provide flexibility for diverse applications, from construction frameworks to automotive assemblies.

Professional Applications & Engineering Value

This Grade 8 carriage bolt is engineered to address critical challenges in demanding environments where vibration, heavy loads, and corrosion are common. The zinc yellow-chromate plated steel construction combats moisture and chemical exposure, ideal for outdoor construction, agricultural equipment, and automotive undercarriages. Its square neck eliminates the need for secondary locking mechanisms, speeding up assembly in wood-to-metal or structural steel connections while preventing loosening. The coarse UNC threading and Class 2A fit ensure rapid installation with minimal cross-threading risks, reducing labor costs in high-volume projects. With 150,000 PSI tensile strength, it reliably secures critical joints in machinery, trailers, and infrastructure, delivering long-term reliability where failure is not an option.

Specification Summary & Compliance

This carriage bolt adheres to precise dimensional standards with a 5/16"-18 UNC coarse thread and Class 2A thread fit for consistent compatibility. Manufacturing and material properties comply with ASME B18.5 and SAE J429 specifications, ensuring uniformity and performance reliability. The product meets industry requirements for high-strength fasteners, with full traceability for quality assurance in regulated sectors.