S-91247A922 1"-8 x 4 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength: With 120,000 psi tensile strength, this screw provides reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior Corrosion Resistance: The zinc plating offers enhanced protection against rust and environmental elements, extending the service life in demanding industrial settings.
• Optimized for High Torque Applications: The external hex drive and hex head design allow for easy installation and removal with standard tools, ensuring secure fastening under heavy loads.
• Precision Thread Fit: Class 2A thread fit ensures consistent engagement and reduces cross-threading, improving assembly efficiency and joint integrity.
• Robust Material Hardness: Rockwell C25 hardness provides excellent wear resistance, maintaining thread integrity through repeated use and vibration.
• Versatile Coarse Thread Design: 1"-8 UNC coarse threading offers quick assembly and reliable holding power in a wide range of materials, from metal to wood.
• Regulatory Compliance Assurance: Meets ASME B18.2.1, SAE J429, RoHS 3, and REACH standards, ensuring safety, environmental responsibility, and global market acceptance.

Professional Applications & Engineering Value

This Grade 5 steel hex head screw is engineered to address critical challenges in heavy-duty industrial environments, such as machinery assembly, structural frameworks, and equipment manufacturing. The partially threaded design concentrates strength where needed most, preventing loosening under dynamic loads and vibration. Its coarse UNC thread facilitates rapid installation in tough materials, reducing labor time while maintaining a secure grip. The zinc plated finish combats corrosion in humid or outdoor settings, ensuring long-term reliability without frequent maintenance. By combining high tensile strength and precise Class 2A thread fit, this fastener minimizes downtime and enhances the durability of connections in construction, automotive, and industrial machinery applications.

Specification Summary & Compliance

This hex head screw adheres to Class 2A thread fit tolerances and UNC thread standards for consistent performance. Manufactured in accordance with ASME B18.2.1 and SAE J429 specifications, it ensures dimensional accuracy and mechanical reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in regulated industries and commitment to environmental standards.