S-91253A802 5/8"-11 x 2" 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 in demanding industrial applications, reducing the risk of fastener failure under high stress.
• Superior corrosion resistance from the black-oxide finish on alloy steel extends service life in harsh environments, minimizing maintenance and replacement costs.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, enhancing joint integrity in machinery and equipment.
• Fully threaded design with coarse UNC threads allows for faster installation and maximum grip across the entire length, improving efficiency in assembly lines.
• Recessed flat head with 82° countersink enables flush mounting for a clean, aerodynamic surface, ideal for applications where protrusion is not acceptable.
• 3/8" hex drive compatibility offers high torque transfer during installation, reducing slippage and tool wear for consistent, secure fastening.
• Compliance with industry standards including ASME B18.3 and ASTM F835 ensures consistent quality and interoperability, supporting reliable sourcing for B2B procurement.

Professional Applications & Engineering Value

This 5/8"-11 UNC flat head screw is engineered to address critical challenges in heavy-duty industrial settings, where vibration resistance and long-term durability are paramount. The black-oxide alloy steel construction provides enhanced corrosion protection, making it suitable for outdoor machinery, automotive assemblies, and structural frameworks exposed to moisture and chemicals. The coarse thread design ensures quick engagement and robust holding power in materials like steel and cast iron, reducing installation time while maintaining Class 3A thread fit precision for secure, leak-proof connections. Ideal for applications requiring flush mounting, such as conveyor systems or enclosures, this screw minimizes protrusion risks and supports streamlined maintenance cycles, delivering consistent performance in demanding environments.

Specification Summary & Compliance

This product features a 5/8"-11 UNC coarse thread with Class 3A fit for high precision, a length of 2", and a standard 82° countersink angle. It meets ASME B18.3 and ASTM F835 specifications for dimensional accuracy and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are adhered to in industrial supply chains.