S-91253A983 1 1/8"-7 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 in demanding applications, reducing the risk of fastener failure.
• Superior thread fit with Class 3A tolerance provides precise, secure engagement for vibration resistance and consistent assembly quality.
• Black-oxide finish on alloy steel offers enhanced corrosion resistance and a durable, non-reflective surface for long-term use.
• 82° countersink angle and flat head design allows for a flush, low-profile installation, improving aesthetics and safety.
• Fully threaded coarse (UNC) design enables faster installation and higher resistance to loosening under dynamic loads.
• 3/4" hex drive facilitates easy installation and removal with standard tools, reducing assembly time and labor costs.
• Compliance with ASTM F835, RoHS 3, and REACH ensures material quality, environmental safety, and suitability for regulated industries.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this black-oxide alloy steel flat head screw addresses critical challenges in machinery, construction, and equipment assembly. Its high tensile strength (130,000 psi) and Rockwell C37 hardness provide durability under extreme stress, preventing stripping and fatigue. The Class 3A thread fit and coarse UNC threading ensure secure fastening in materials where vibration or thermal expansion is a concern, minimizing maintenance needs. The 82° countersink angle allows seamless integration into angled surfaces, reducing protrusion risks. Ideal for structural frameworks and industrial machinery, this screw combines robust material properties with compliance to ASTM F835, offering reliability in demanding environments.

Specification Summary & Compliance

This screw features a 1 1/8"-7 UNC coarse thread with Class 3A fit for high precision, ensuring tight tolerances and consistent performance. It is manufactured in accordance with ASTM F835 specifications for mechanical and material requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming it is free of hazardous substances and suitable for global industrial use.