S-91283A144 1 1/8"-7 x 4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 100,000 PSI ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Rockwell C19 hardness provides superior resistance to wear and deformation, extending service life in demanding environments.
• Coarse UNC threading with Class 2A fit offers quick assembly and secure fastening, minimizing installation time and improving joint integrity.
• Partially threaded design allows for precise clamping force control, ideal for applications where specific unthreaded grip length is required.
• External hex drive and hex head facilitate easy installation and removal with standard tools, enhancing maintenance efficiency.
• Compliance with ASME B18.2.1 standards guarantees consistent quality and interoperability, ensuring compatibility in regulated industrial setups.
• RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence, supporting sustainable and responsible manufacturing practices.

Professional Applications & Engineering Value

This Grade 5 steel hex head screw is engineered to address critical challenges in heavy-duty industrial applications, such as construction machinery, automotive assemblies, and structural frameworks. Its coarse UNC thread and Class 2A fit provide excellent vibration resistance and ease of installation, reducing the likelihood of loosening under dynamic loads. The partially threaded configuration allows for optimal stress distribution, preventing thread damage in high-clamp force scenarios. Made from high-strength steel with a Rockwell C19 hardness, it withstands harsh conditions, including exposure to mechanical stress and environmental factors, while the external hex drive ensures compatibility with common tools for efficient maintenance. Ideal for industrial fastening solutions requiring durability and precision, this screw delivers reliable performance in applications demanding robust, long-lasting connections.

Specification Summary & Compliance

This screw features a 1 1/8"-7 UNC coarse thread with Class 2A thread fit, ensuring precise dimensional accuracy and smooth engagement. It adheres to ASME B18.2.1 manufacturing specifications, providing consistent quality and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety standards for industrial use, supporting responsible sourcing and application in global markets.