S-91283A440 1 1/2"-6 x 3 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 a 100,000 psi tensile strength, this screw provides reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior Hardness & Durability – Rockwell C19 hardness ensures excellent resistance to wear and deformation, extending the service life of your assemblies.
• Optimal Thread Engagement – Fully threaded 1 1/2"-6 UNC coarse spacing offers quick installation and enhanced holding power in various materials.
• Precise Thread Fit – Class 2A thread fit guarantees consistent, secure fastening with standard nuts and tapped holes, minimizing assembly issues.
• Heavy-Duty Hex Head Design – External hex drive and 2 1/4" head width allow for high torque application with common tools, speeding up maintenance and installation.
• Regulatory Compliance – Meets ASME B18.2.1 and SAE J429 standards, and is RoHS 3 and REACH compliant, ensuring safety and environmental responsibility.
• Versatile Material Compatibility – Made from high-quality steel, it withstands harsh industrial environments and offers corrosion resistance when specified with appropriate coatings.

Professional Applications & Engineering Value

This Grade 5 steel hex head screw is engineered to address critical challenges in heavy-duty industrial settings, such as structural assemblies, machinery, and construction projects. Its 1 1/2"-6 UNC coarse thread and fully threaded design ensure rapid installation and robust load distribution, reducing vibration loosening in dynamic applications. The external hex drive facilitates easy tightening with standard wrenches, enhancing efficiency in maintenance and production lines. By combining high tensile strength and precise Class 2A thread fit, it minimizes the risk of stripping and ensures long-term reliability, making it ideal for applications demanding consistent performance under stress, such as in automotive, agricultural equipment, and industrial frameworks.

Specification Summary & Compliance

This fastener features a 1 1/2"-6 UNC coarse thread with Class 2A tolerance for precise fit, a length of 3 1/2", and is fully threaded. It complies with ASME B18.2.1 and SAE J429 Grade 5 specifications, ensuring adherence to industry standards for dimensions and mechanical properties. Additionally, it is confirmed to be RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, supporting environmental and safety regulations in global supply chains.