S-91263A611 1/2"-13 x 2 1/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc-plated alloy steel construction, ensuring long-term reliability in harsh industrial environments.
• Superior load-bearing capacity thanks to 130,000 psi tensile strength and Rockwell C39 hardness, reducing the risk of fastener failure under stress.
• Precise and secure fastening with Class 3A thread fit, minimizing loosening and vibration-related issues in critical assemblies.
• Easy installation and flush finish provided by the standard 82° countersink angle and 5/16" hex drive, saving time and improving aesthetics.
• Wide compatibility and durability through UNC coarse threading and full threading, offering strong holding power in various materials.
• Compliance with rigorous standards including ASTM F835, RoHS 3, and REACH, ensuring safety and environmental responsibility for global projects.
• Optimized for heavy-duty use with a flat head design and 2-1/4" length, ideal for applications requiring high-strength, low-profile fasteners.

Professional Applications & Engineering Value

These zinc-plated alloy steel flat head screws are engineered to address common industrial challenges such as vibration-induced loosening and corrosion in demanding environments. The UNC coarse thread and Class 3A thread fit provide excellent grip and resistance to shear forces, making them suitable for heavy machinery, structural steel assemblies, and automotive components. The 82° countersink angle ensures a flush mount, reducing protrusion risks and enhancing safety. With high tensile strength and full threading, they deliver consistent performance in applications like construction, manufacturing, and equipment repair, where reliability and compliance with ASTM F835 standards are critical for long-term operational integrity.

Specification Summary & Compliance

This product adheres to precise dimensional tolerances, including Class 3A thread fit for superior accuracy and UNC coarse threading with a 1/2"-13 size. It meets ASTM F835 specifications for mechanical properties and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for international industrial use.