S-91255A057 5/8"-11 x 3" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance under heavy loads and high-stress conditions.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure fastening and reduced risk of loosening in critical applications.
• Robust Rockwell C37 hardness offers excellent wear resistance and durability, minimizing deformation during installation and use.
• Convenient 3/8" hex drive allows for easy installation and high-torque application with standard tools, improving assembly efficiency.
• Fully threaded coarse UNC design ensures maximum grip and holding power across the entire 3" length for versatile fastening needs.
• Compliance with major standards including ASME B18.3 and ASTM F835 guarantees consistent quality and interoperability in professional settings.

Professional Applications & Engineering Value

This 5/8"-11 UNC rounded head screw is engineered from black-oxide alloy steel to address common industrial challenges such as vibration-induced loosening and environmental corrosion. The Class 3A thread fit and coarse thread spacing provide superior clamping force and rapid assembly in heavy machinery, structural frameworks, and automotive systems. Its fully threaded design and high tensile strength ensure uniform stress distribution and long-term reliability, making it ideal for applications requiring repeated disassembly and reassembly. The rounded button head with a hex drive offers a low-profile, secure fastening solution that resists stripping and accommodates tight spaces, enhancing both safety and maintenance efficiency in demanding engineering projects.

Specification Summary & Compliance

This screw features a 5/8"-11 UNC coarse thread with Class 3A fit for precise dimensional accuracy, and is fully threaded over a 3" length. It is manufactured in compliance with ASME B18.3 and ASTM F835 specifications, ensuring consistent performance and interchangeability. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting strict environmental and safety regulations for use in global industrial markets.