S-92620A559 1/4"-20 x 6" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity: With a tensile strength of 150,000 psi and Rockwell C33 hardness, this screw ensures reliable performance under extreme mechanical stress, reducing the risk of fastener failure.
• Superior Corrosion Resistance: The zinc yellow-chromate plating provides excellent protection against rust and environmental degradation, extending service life in harsh industrial settings.
• Precise Thread Engagement: UNC coarse threads with Class 2A fit offer quick assembly and secure fastening, minimizing cross-threading and installation errors.
• High-Strength Material Construction: Made from Grade 8 steel, it delivers exceptional durability and fatigue resistance for heavy-duty applications.
• Optimized Drive Design: The external hex head allows for high torque application with standard tools, ensuring tight and stable connections.
• Full Thread Coverage: Fully threaded along the 6" length provides uniform load distribution and versatile grip range in various material thicknesses.
• Industry Compliance Assurance: Meets ASME B18.2.1 and SAE J429 specifications, guaranteeing consistent quality and interoperability in professional assemblies.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, structural frameworks, and automotive systems where vibration, high loads, and environmental exposure are common. The steel material and fully threaded UNC coarse design ensure rapid installation and robust clamping force, preventing joint loosening over time. The zinc yellow-chromate plating significantly enhances corrosion resistance, making it ideal for outdoor or humid environments. By combining 150,000 psi tensile strength with Rockwell C33 hardness, it minimizes deformation under stress, providing long-term reliability in demanding industrial applications while adhering to standardized dimensions for seamless replacement and maintenance.

Specification Summary & Compliance

This fastener features precise Class 2A thread fit with UNC coarse threads (1/4"-20) and a length of 6", manufactured to ASME B18.2.1 and SAE J429 standards. It complies with industry-recognized specifications for dimensional accuracy, mechanical properties, and material quality, ensuring consistent performance and safety in professional use.