S-91253A248 10-24 x 1 1/8" 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 in demanding applications.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in critical machinery and equipment.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable finish, extending service life in harsh industrial environments.
• Hex drive design allows for high-torque installation with standard tools, ensuring efficient assembly and reducing installation time.
• 82° countersink angle and flat head profile enable a flush finish when installed, minimizing protrusion and improving safety and aesthetics.
• Fully threaded shank maximizes grip and load distribution along the entire length, providing consistent holding power in various materials.
• Compliance with ASTM F835, RoHS 3, and REACH guarantees adherence to rigorous industry standards for safety, environmental responsibility, and material quality.

Professional Applications & Engineering Value

These 10-24 UNC flat head screws are engineered to address common challenges in industrial fastening, such as vibration loosening and material fatigue. Made from black-oxide alloy steel with a Rockwell C39 hardness, they deliver outstanding durability and resistance to wear, making them ideal for heavy-duty applications in machinery, automotive assemblies, and structural frameworks. The coarse thread spacing and right-hand threading facilitate quick installation and reliable grip in metals and composites, while the hex drive ensures secure tool engagement, reducing slippage during high-torque applications. This combination of material strength and precision threading provides long-term reliability, minimizing maintenance needs and downtime in professional settings.

Specification Summary & Compliance

This screw features a Class 3A thread fit with UNC coarse threading, ensuring precise dimensional accuracy and compatibility with standard nuts and tapped holes. It meets ASTM F835 specifications for mechanical properties and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to environmental and safety standards without hazardous substances.