S-91309A706 1/2"-13 x 1/2" ASME B18.2.1, SAE J429 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating that protects against rust and extends service life in harsh industrial environments
• High tensile strength of 60,000 psi ensures reliable performance under heavy loads and prevents fastener failure
• Precise Class 2A thread fit provides smooth assembly and reduces the risk of cross-threading during installation
• Coarse UNC threading offers faster installation and better performance in materials prone to stripping
• External hex drive design allows for high torque application with standard tools, ensuring secure fastening
• Full threading along the entire length maximizes grip and distributes stress evenly for enhanced joint integrity
• Compliance with ASME B18.2.1 and SAE J429 guarantees consistent quality and interchangeability in regulated applications

Professional Applications & Engineering Value

This 1/2"-13 UNC steel hex head screw is engineered to address critical fastening challenges in demanding industrial settings. The zinc plating provides a durable barrier against moisture and chemicals, making it ideal for outdoor machinery, construction equipment, and automotive assemblies where corrosion can compromise safety. Its coarse thread design ensures rapid installation in soft materials like aluminum or cast iron, reducing labor time while maintaining Class 2A thread fit accuracy for vibration resistance. With a 60,000 psi tensile strength and Rockwell B69 hardness, it withstands extreme mechanical stresses in structural frameworks, heavy-duty manufacturing, and transportation systems, delivering long-term reliability and reducing maintenance downtime.

Specification Summary & Compliance

This screw features a 1/2"-13 UNC coarse thread with Class 2A fit for precise dimensional tolerance, ensuring compatibility with standard nuts and tapped holes. It is manufactured in accordance with ASME B18.2.1 and SAE J429 specifications, guaranteeing consistent performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for use in regulated industries.