S-97000A519 5/16"-18 x 2" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Maximum load-bearing capacity with 150,000 PSI tensile strength and Grade 8 classification for critical structural applications
• Superior corrosion resistance through zinc yellow-chromate plating that protects against rust in harsh industrial environments
• Secure anti-rotation performance thanks to the square neck design that prevents spinning during installation
• Enhanced durability with Rockwell C33 hardness that maintains structural integrity under heavy vibration and stress
• Reliable coarse threading using UNC 5/16"-18 threads with Class 2A fit for quick assembly and consistent engagement
• Full-threaded design providing maximum grip length and versatility across various material thicknesses
• Industry-standard compliance meeting ASME B18.5 and SAE J429 specifications for guaranteed quality and interchangeability

Professional Applications & Engineering Value

These Grade 8 carriage bolts deliver exceptional engineering value for heavy machinery, structural steel connections, and industrial equipment assembly. The combination of 150,000 PSI tensile strength and Rockwell C33 hardness ensures reliable performance in high-vibration environments where fastener failure is not an option. The zinc yellow-chromate plating provides superior corrosion protection, making these UNC threaded carriage bolts ideal for outdoor applications, agricultural equipment, and construction projects exposed to weather elements. The square neck carriage bolt design prevents rotation during nut tightening, eliminating the need for secondary locking mechanisms and reducing installation time. With full threading and coarse thread spacing, these fasteners offer excellent pull-out resistance and are particularly valuable in wood-to-metal applications and structural framing where disassembly is rarely required.

Specification Summary & Compliance

This heavy-duty carriage bolt features precise Class 2A thread fit with 5/16"-18 UNC coarse threading and maintains dimensional accuracy per ASME B18.5 standards. The fastener complies with SAE J429 specifications for Grade 8 mechanical properties, ensuring consistent performance across industrial applications. Manufactured with a square neck measuring 0.32" width and 0.19" length, the bolt provides secure anti-rotation characteristics. The zinc yellow-chromate finish offers enhanced corrosion protection while meeting industry requirements for surface treatments in demanding environments.