S-91253A976 5/8"-11 x 3/4" 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 in high-stress industrial applications, reducing the risk of fastener failure.
• Black-oxide coating on alloy steel provides superior corrosion resistance and a durable finish, extending service life in demanding environments.
• Class 3A thread fit with UNC coarse threading delivers precise, secure fastening with excellent vibration resistance, minimizing loosening over time.
• 82° countersink angle and flat head design allows for flush mounting, creating a smooth surface and enhancing aesthetic and functional integration.
• 3/8" hex drive enables easy installation and removal with standard tools, improving assembly efficiency and reducing labor time.
• Full threading along the 3/4" length ensures maximum grip and holding power across the entire fastener, providing consistent clamping force.
• Compliance with ASTM F835, RoHS 3, and REACH guarantees adherence to industry standards for safety, environmental responsibility, and material quality.

Professional Applications & Engineering Value

Engineered for heavy-duty applications, this 5/8"-11 UNC flat head screw in black-oxide alloy steel addresses critical challenges in industrial assembly, such as vibration-induced loosening and corrosion. The coarse thread spacing and Class 3A fit provide superior engagement in materials like metal and hardwood, reducing the need for frequent retightening. With a Rockwell C37 hardness and high tensile strength, it withstands extreme loads in machinery, construction, and automotive frameworks. The fully threaded design and 82° countersink ensure seamless integration, making it ideal for applications requiring flush surfaces and reliable, long-term fastening solutions.

Specification Summary & Compliance

This screw features precise UNC coarse threads with a Class 3A thread fit for tight tolerances and optimal performance. Dimensions include a 5/8"-11 thread size, 3/4" length, and 3/8" hex drive. It complies with ASTM F835 specifications for mechanical properties, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental safety and regulatory adherence in industrial use.