S-91253A804 5/8"-11 x 2 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.
• Corrosion-resistant black-oxide finish on alloy steel enhances durability and longevity in harsh industrial environments.
• Precise Class 3A thread fit provides superior engagement and vibration resistance, maintaining joint integrity.
• Fully threaded UNC coarse design allows for faster installation and increased holding power in a wide range of materials.
• Hex drive compatibility (3/8") offers easy installation with standard tools, improving assembly efficiency.
• Flat head with standard profile ensures a flush finish, ideal for applications where a smooth surface is critical.
• Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality and interoperability in professional settings.

Professional Applications & Engineering Value

This 5/8"-11 UNC flat head screw is engineered to address common industrial challenges such as vibration loosening and material fatigue. The black-oxide alloy steel construction provides excellent corrosion resistance, making it suitable for outdoor machinery, structural assemblies, and heavy equipment where exposure to moisture is a concern. The fully threaded right-hand coarse thread design ensures quick, secure fastening in wood, metal, and composite materials, reducing installation time while enhancing load distribution. With a high tensile strength of 130,000 psi and Rockwell C37 hardness, it withstands dynamic loads and extreme conditions, offering long-term reliability in construction, automotive, and manufacturing applications. The hex drive allows for high-torque application without slippage, ensuring consistent performance in critical joints.

Specification Summary & Compliance

This fastener features a thread fit of Class 3A for precise dimensional accuracy, adhering to UNC coarse thread standards. It is manufactured in compliance with ASME B18.3 and ASTM F835 specifications, ensuring consistent quality and performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting safe and sustainable usage in global markets.