S-91255A827 0-80 x 5/8" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from black-oxide alloy steel, extending service life in harsh industrial environments
• Precise Class 3A thread fit ensures secure fastening with minimal vibration loosening in critical assemblies
• High 120,000 psi tensile strength provides reliable performance under extreme mechanical stress
• Rockwell C39 hardness maintains thread integrity and prevents stripping during repeated installations
• Hex drive design (0.035") allows for high-torque application with standard tools, reducing installation time
• Fully threaded UNF fine pitch delivers maximum grip length and uniform load distribution
• Rounded button head profile offers a low-profile, aesthetically clean finish while minimizing snagging risks

Professional Applications & Engineering Value

Engineered for precision-critical applications, these black-oxide alloy steel screws combine Class 3A thread fit with UNF fine threading to solve common industrial challenges like vibration-induced loosening and thread galling. The fully threaded design ensures consistent clamping force across the entire engagement length, making them ideal for electronic enclosures, precision instruments, and aerospace components where dimensional stability is paramount. The corrosion-resistant black-oxide finish protects against moisture and chemical exposure in demanding environments, while the rounded head with hex drive facilitates quick assembly in confined spaces without compromising structural integrity.

Specification Summary & Compliance

This fastener maintains Class 3A thread fit tolerance per UNF standards with 0-80 thread size and 5/8" length. Manufacturing complies with ASME B18.3 and ASTM F835 specifications, ensuring dimensional consistency and mechanical performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, confirming suitability for regulated industries.