S-91253A984 1 1/8"-7 x 4" 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.
• Black-oxide coating on alloy steel provides enhanced corrosion resistance and a durable, wear-resistant finish for longer service life.
• Class 3A thread fit offers superior precision and tighter tolerances, ensuring secure, vibration-resistant connections in critical assemblies.
• Fully threaded design allows for maximum grip and load distribution along the entire length, improving joint integrity.
• 82° countersink angle enables a flush, low-profile installation, minimizing protrusion and enhancing safety in machinery and structural components.
• Coarse UNC threading facilitates quicker installation and removal, saving time in maintenance and assembly operations.
• Compliance with ASTM F835, RoHS 3, and REACH guarantees that the screws meet rigorous industry standards for safety and environmental responsibility.

Professional Applications & Engineering Value

Engineered for demanding environments, these 1 1/8"-7 UNC flat head screws are ideal for heavy machinery, construction equipment, and automotive assemblies where high tensile strength and durability are critical. The black-oxide alloy steel construction resists rust and wear, extending fastener life in harsh conditions. With a Class 3A thread fit and coarse thread spacing, they provide secure, vibration-resistant fastening that prevents loosening under dynamic loads. The 82° countersink angle ensures a smooth, flush fit, reducing snag hazards and improving aerodynamics in enclosed systems. These screws deliver reliable performance in industrial fastening applications, from structural frameworks to precision equipment, ensuring long-term operational safety and efficiency.

Specification Summary & Compliance

This product features precise Class 3A thread fit per UNC standards, with a thread size of 1 1/8"-7 and coarse spacing for optimal engagement. It complies with ASTM F835 specifications for mechanical properties and is verified to be RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring adherence to environmental and safety regulations. Dimensions include a 4" length, 2.188" head diameter, and 3/4" hex drive for standardized tool compatibility.