S-91253A489 1/2"-13 x 5/8" 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 high-stress industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the Black-Oxide finish on Alloy Steel extends service life in harsh environments, minimizing maintenance needs.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant connections in critical assemblies.
• Hex drive design with 5/16" drive size allows for high-torque installation and easy removal, improving assembly efficiency.
• 82° countersink angle and flat head profile enable flush mounting for a smooth, professional finish and reduced snagging hazards.
• Fully threaded coarse (UNC) design ensures maximum grip and load distribution across the entire length for enhanced holding power.
• Compliance with ASME, ASTM, RoHS, and REACH standards guarantees quality, safety, and environmental responsibility for global supply chains.

Professional Applications & Engineering Value

These 1/2"-13 UNC flat head hex drive screws are engineered to address common industrial challenges, such as vibration loosening and corrosion in demanding environments. The Black-Oxide Alloy Steel construction provides a durable barrier against moisture and chemicals, ideal for machinery, automotive, and structural applications where longevity is critical. The Class 3A thread fit and coarse thread spacing ensure quick assembly and reliable performance under dynamic loads, reducing downtime. With a fully threaded design and 82° countersink angle, they offer seamless integration into metal and wood assemblies, providing a secure, flush fit that enhances both aesthetics and safety in heavy-duty settings.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including Class 3A thread fit for tight tolerances and UNC coarse threads with a 1/2"-13 size. It meets ASME B18.3 and ASTM F835 specifications for consistency and reliability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it ensures environmental safety and global market suitability.