S-91253A256 10-24 x 2 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 performance under high-stress industrial conditions, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish on alloy steel extends service life in demanding environments, minimizing maintenance needs.
• Precise Class 3A thread fit provides tighter tolerances for secure fastening and vibration resistance in machinery assemblies.
• 82° countersink angle and flat head design allow for flush mounting, enhancing aesthetics and preventing snagging in automated systems.
• Hex drive compatibility with a 1/8" drive size enables quick installation and removal using standard tools, boosting assembly efficiency.
• Rockwell C39 hardness offers excellent wear resistance, ensuring durability in high-cycle applications without deformation.
• Compliance with ASTM F835, RoHS 3, and REACH guarantees adherence to industry standards for safety and environmental regulations, simplifying procurement for global projects.

Professional Applications & Engineering Value

These 10-24 UNC flat head screws are engineered to address common industrial challenges, such as vibration loosening and corrosion in harsh settings. The black-oxide alloy steel construction provides a robust barrier against moisture and chemicals, ideal for automotive, machinery, and electrical enclosures where reliability is critical. With a coarse UNC thread and partial threading, they offer superior grip in softer materials while reducing installation time. The 82° countersink angle ensures a seamless fit in pre-drilled holes, preventing protrusions that could interfere with moving parts. This combination of high tensile strength and precise Class 3A thread fit delivers long-term stability, minimizing downtime and maintenance costs in industrial applications.

Specification Summary & Compliance

This screw features a 10-24 UNC coarse thread with a Class 3A fit for high precision, ensuring consistent performance in threaded assemblies. It meets ASTM F835 specifications for mechanical properties and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and safety-focused industries. Dimensions include a length of 2 1/4", head diameter of 0.411", and a minimum thread length of 7/8", all manufactured to strict tolerances for reliable integration.