S-91309A912 1"-8 x 2" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity – With 60,000 psi tensile strength and Rockwell B69 hardness, this screw delivers reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior Corrosion Resistance – Zinc plating provides a durable protective layer, extending service life in harsh industrial environments and minimizing maintenance needs.
• Easy Installation & Removal – The external hex drive and coarse UNC threads allow for quick assembly and disassembly, saving valuable labor time and improving workflow efficiency.
• Precise Thread Fit – Class 2A thread fit ensures consistent engagement and secure fastening, preventing loosening under vibration and dynamic loads.
• Full Threading for Maximum Grip – Fully threaded design offers uniform clamping force along the entire length, enhancing joint stability in heavy-duty assemblies.
• Broad Regulatory Compliance – Meets ASME B18.2.1, ASTM A307, RoHS 3, and REACH standards, ensuring safety, environmental responsibility, and global acceptance for industrial projects.
• Robust Material Construction – Made from high-quality steel, this fastener combines durability with cost-effectiveness, providing long-term value in demanding applications.

Professional Applications & Engineering Value

This 1"-8 UNC hex head screw is engineered to address critical challenges in industrial fastening, such as vibration-induced loosening and corrosion degradation. The coarse thread design and Class 2A fit enable rapid installation in structural steelwork, machinery, and heavy equipment, where time efficiency and joint integrity are paramount. The zinc-plated finish significantly enhances corrosion resistance, making it suitable for outdoor or humid environments without compromising the 60,000 psi tensile strength. Fully threaded for uniform stress distribution, it prevents joint failure in high-strength applications like construction frameworks, automotive assemblies, and manufacturing systems, ensuring reliable performance under continuous load and thermal cycling.

Specification Summary & Compliance

This product adheres to Class 2A thread fit per UNC standards, ensuring precise dimensional accuracy and interchangeability. It conforms to ASME B18.2.1 and ASTM A307 specifications for mechanical properties and manufacturing consistency. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms the absence of hazardous substances, supporting environmental and workplace safety in global supply chains.