S-91255A816 12-24 x 1/2" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with Black-Oxide coating, ideal for harsh industrial environments.
• Superior tensile strength of 120,000 psi ensures reliable performance under high-stress conditions.
• Precise Class 3A thread fit provides secure, vibration-resistant fastening in critical assemblies.
• Fully threaded UNC coarse spacing allows for faster installation and stronger holding power.
• Hex drive (9/64") design offers easy, slip-resistant tightening with standard tools.
• High Rockwell C39 hardness enhances durability and reduces wear over repeated use.
• Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality and engineering reliability.

Professional Applications & Engineering Value

These Black-Oxide Alloy Steel Rounded Head Screws are engineered to address common industrial challenges such as vibration loosening and environmental degradation. The UNC coarse thread and Class 3A fit ensure quick, secure fastening in materials like metal and hardened plastics, reducing assembly time while maintaining integrity under dynamic loads. The button head style provides a low-profile finish, minimizing protrusion in compact spaces. Ideal for machinery, automotive, and electrical enclosures, these screws deliver long-term reliability with their high tensile strength and corrosion-resistant coating, meeting rigorous industrial screw requirements.

Specification Summary & Compliance

This screw features a 12-24 UNC coarse thread with Class 3A precision fit, ensuring tight tolerances per ASME B18.3 and ASTM F835 standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible manufacturing. Dimensions include a 1/2" length, 0.41" head diameter, and right-hand threading for consistent performance in industrial applications.