S-91253A724 1/2"-13 x 3" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 130,000 PSI ensures reliable performance under extreme loads and vibrations in demanding industrial environments.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life and reducing maintenance needs.
• Precise Class 3A thread fit guarantees secure, vibration-resistant assemblies with minimal risk of loosening over time.
• Partially threaded design allows for controlled clamping force, ideal for applications requiring specific grip range and joint integrity.
• Standard 82° countersink angle provides a flush, professional finish when installed, enhancing safety and aesthetic appeal.
• Heavy-duty Rockwell C39 hardness offers excellent wear resistance, maintaining thread integrity through repeated use and installation.
• 5/16" hex drive enables easy installation with common tools, reducing assembly time and improving workflow efficiency.

Professional Applications & Engineering Value

This 1/2"-13 UNC flat head socket cap screw is engineered for high-stress applications where failure is not an option. The black-oxide alloy steel construction provides a durable barrier against rust and corrosion, making it suitable for machinery, automotive assemblies, and structural frameworks exposed to harsh conditions. Its partially threaded configuration and coarse thread spacing ensure optimal grip in materials like steel and cast iron, preventing strip-out and maintaining clamp load. The Class 3A thread fit and ASME B18.3 compliance deliver consistent, reliable performance, reducing downtime and replacement costs in industrial maintenance and manufacturing operations.

Specification Summary & Compliance

This screw features a 1/2"-13 UNC coarse thread with a Class 3A fit for precision threading and a 3" length with a minimum thread length of 1-7/8". It meets ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various industrial and international markets.