S-91253A803 5/8"-11 x 2 1/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional durability with Rockwell C37 hardness and 130,000 psi tensile strength for long-lasting performance in demanding environments.
• Precise installation and secure fit thanks to Class 3A thread fit and fully threaded design, reducing the risk of loosening under vibration.
• High corrosion resistance from the black-oxide finish on alloy steel, extending service life in various industrial conditions.
• Efficient assembly with standard tools using the 3/8" hex drive, allowing for quick and easy installation without slippage.
• Reliable flush mounting with an 82° countersink angle and standard flat head profile for a smooth, professional finish.
• Broad compatibility with UNC coarse threads and right-hand direction, ensuring easy integration into existing systems.
• Compliance with major standards including ASME B18.3 and ASTM F835, guaranteeing quality and safety for industrial applications.

Professional Applications & Engineering Value

This 5/8"-11 UNC flat head socket cap screw is engineered to address critical industrial challenges, such as vibration-induced loosening and corrosion in heavy machinery. Made from black-oxide alloy steel, it offers superior strength and environmental resistance, ideal for applications in construction, automotive, and manufacturing where reliability is paramount. The fully threaded design and Class 3A thread fit ensure tight, precise fastening, reducing maintenance needs and downtime. Its coarse thread spacing and hex drive facilitate quick assembly in high-volume production settings, while the flat head profile provides a seamless finish for safety and aesthetics. Trust this screw for demanding industrial-grade fastening that meets rigorous performance standards.

Specification Summary & Compliance

This product adheres to precise dimensional tolerances, including a Class 3A thread fit for accurate engagement and UNC coarse threading. It meets ASME B18.3 and ASTM F835 specifications for consistency and reliability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it ensures environmental safety and material integrity for global industrial use.