S-92620A642 3/8"-16 x 5 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity: With a tensile strength of 150,000 psi, this screw reliably handles extreme mechanical stress in demanding applications.
• Superior Corrosion Resistance: The zinc yellow-chromate plating provides a durable barrier against rust and environmental degradation, extending service life.
• Optimized for High-Torque Installation: The external hex head design allows for secure tool engagement and efficient application of high torque without slippage.
• Reliable Thread Engagement: The fully threaded 3/8"-16 UNC coarse thread with Class 2A fit ensures consistent, secure fastening and easier alignment.
• Guaranteed Material Integrity: The Grade 8 steel construction and Rockwell C33 hardness provide outstanding durability and resistance to wear and deformation.
• Broad Industrial Compatibility: Manufactured to meet ASME B18.2.1 and SAE J429 standards, ensuring consistent quality and interchangeability in professional settings.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered for critical, high-stress applications where failure is not an option. The combination of high-strength steel and a fully threaded UNC coarse thread design solves common industrial challenges like vibration-induced loosening and assembly stress. The zinc yellow-chromate plating significantly enhances corrosion resistance, making it ideal for outdoor machinery, construction equipment, and automotive assemblies exposed to harsh environments. Its external hex drive facilitates quick, high-torque installation with standard tools, reducing assembly time while maintaining the integrity of the Class 2A thread fit. This fastener delivers reliable performance in structural frameworks, heavy-duty manufacturing, and maintenance operations, ensuring long-term operational safety and reduced downtime.

Specification Summary & Compliance

This product features a 3/8"-16 UNC thread with a Class 2A thread fit for standard tolerance and easy assembly. It is manufactured from high-strength steel and plated with a zinc yellow-chromate finish. The screw complies with ASME B18.2.1 and SAE J429 specifications, ensuring it meets rigorous industrial standards for dimensions, mechanical properties, and performance. This fastener is suitable for applications requiring verified material strength and dimensional accuracy.