S-91253A922 1"-8 x 4 1/2" 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 high-stress conditions, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in demanding industrial environments.
• Precise Class 3A thread fit provides secure, vibration-resistant connections, minimizing loosening in critical assemblies.
• Convenient 5/8" hex drive allows for easy installation and removal with standard tools, saving time on maintenance and assembly.
• Partially threaded design offers optimal grip and clamping force control, ideal for applications requiring specific engagement lengths.
• Compliance with ASTM F835, RoHS 3, and REACH guarantees material consistency, performance reliability, and environmental safety for global supply chains.
• Coarse UNC threading enables quick assembly and better debris resistance, enhancing efficiency in rugged applications.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial fastening, these 1"-8 UNC flat head screws in black-oxide alloy steel address common challenges like corrosion, vibration loosening, and high tensile demands. The partially threaded configuration ensures precise clamping in machinery, structural frames, and equipment assemblies, while the 82° countersink angle provides a flush fit for streamlined surfaces. With a Rockwell C37 hardness and robust coarse thread design, they excel in environments requiring durability and rapid installation, such as construction, automotive, and manufacturing sectors. This combination of material strength and hex drive compatibility reduces downtime and enhances long-term reliability in critical B2B applications.

Specification Summary & Compliance

This screw adheres to Class 3A thread fit and UNC coarse thread standards for precise dimensional accuracy. It meets ASTM F835 specifications for mechanical properties and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring no restricted substances are used. The manufacturing process focuses on consistency in length, thread spacing, and hardness to support industrial quality requirements.