S-91253A189 8-32 x 1/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 130,000 psi ensures reliable, long-lasting fastening in demanding industrial environments.
• Superior corrosion resistance from the Black-Oxide finish on Alloy Steel, extending service life and reducing maintenance needs.
• Precise Class 3A thread fit guarantees secure engagement and vibration resistance, minimizing the risk of loosening.
• 82° countersink angle allows for a flush, professional finish, ideal for applications where a smooth surface is critical.
• Hex drive design (3/32") provides high torque capability and easy installation with standard tools, reducing assembly time.
• Full threading offers maximum grip along the entire shank, enhancing pull-out strength and load distribution.
• Compliance with ASTM F835, RoHS 3, and REACH ensures material quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

Engineered for high-performance industrial fastening, these 8-32 UNC flat head screws in Black-Oxide Alloy Steel address critical challenges in machinery, electronics, and metal fabrication. The coarse thread spacing and Class 3A thread fit provide excellent resistance to vibration and shock, preventing joint failure in dynamic applications. The 82° countersink angle ensures a seamless fit in pre-drilled holes, eliminating protrusions that could interfere with moving parts or aesthetics. With a Rockwell C39 hardness and fully threaded design, these screws deliver consistent clamping force and durability, making them ideal for assembly lines requiring speed and reliability. Their hex drive facilitates quick installation, reducing labor costs while maintaining high tensile strength for heavy-duty use.

Specification Summary & Compliance

This product adheres to UNC thread standards with a Class 3A thread fit 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 right-hand thread direction and coarse thread spacing are manufactured to industry norms, supporting interoperability in various assemblies.