S-91247A595 5/16"-18 x 3" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 PSI provides reliable performance in demanding applications, reducing the risk of fastener failure.
• Grade 5 steel construction with Rockwell C25 hardness offers superior durability and resistance to wear, extending the service life of your assemblies.
• Zinc plating finish enhances corrosion resistance, protecting the screw from rust in various industrial environments.
• 5/16"-18 UNC coarse thread with Class 2A fit ensures easy and quick installation, saving time and labor costs during assembly.
• External hex drive and hex head design allows for high-torque application with standard tools, providing a secure and tight fastening.
• Partially threaded shank helps in precise clamping and prevents over-tightening, improving joint integrity in structural applications.
• Compliance with ASME B18.2.1, RoHS 3, and REACH guarantees adherence to industry standards and environmental safety, ensuring reliable and sustainable use.

Professional Applications & Engineering Value

This Grade 5 steel hex head screw is engineered to address common industrial challenges, such as vibration-induced loosening and material fatigue. Its 5/16"-18 UNC coarse thread and Class 2A thread fit provide excellent grip in coarse-grained materials, reducing the need for frequent maintenance. The zinc plated finish offers added protection against corrosion, making it ideal for outdoor equipment, machinery frames, and automotive assemblies where exposure to harsh conditions is a concern. With partial threading, it ensures optimal load distribution, minimizing stress concentrations in heavy-duty applications like construction and manufacturing. By meeting ASME B18.2.1 and other key standards, this fastener delivers consistent performance, enhancing the reliability and longevity of your engineering projects.

Specification Summary & Compliance

This product features precise dimensions, including a 3" length and thread diameter of 0.3125", with a Class 2A thread fit per UNC standards for accurate assembly. It complies with ASME B18.2.1 and SAE J429 specifications, ensuring high manufacturing quality. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.