S-91253A816 5/8"-11 x 6" 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 heavy loads and vibration, reducing failure risks in critical applications.
• Superior thread fit with Class 3A precision provides tighter tolerances for secure fastening and minimized loosening in high-stress environments.
• Black-oxide coating on alloy steel enhances corrosion resistance and durability, extending service life in demanding industrial conditions.
• Partially threaded design with coarse UNC spacing allows for faster installation and improved grip in softer materials, saving assembly time.
• 82° countersink angle and flat head profile enable flush mounting for a smooth, professional finish and reduced snagging hazards.
• Rockwell C37 hardness offers excellent wear resistance, maintaining structural integrity through repeated use and harsh handling.
• Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to industry standards for safety, environmental responsibility, and consistent quality.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial use, this 5/8"-11 UNC flat head screw addresses common challenges in construction, machinery, and structural assemblies. The black-oxide alloy steel construction combats rust and wear, ideal for environments with moisture or chemical exposure. Its coarse thread spacing and partial threading provide rapid, secure fastening in wood, metal, or composite materials, reducing installation time while preventing stripping. The 82° countersink angle ensures a seamless fit, minimizing protrusions in safety-critical areas. With a 3/8" hex drive, it allows for high-torque application without slippage, making it a reliable choice for applications demanding high tensile strength and long-term durability under dynamic loads.

Specification Summary & Compliance

This screw features precise Class 3A thread fit per UNC standards, ensuring tight tolerances for secure connections. Dimensions include a 6" length with a minimum thread length of 1 3/4", head diameter of 1.188", and drive size of 3/8". It meets ASTM F835 specifications for mechanical properties and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), guaranteeing environmental safety and regulatory adherence in industrial supply chains.