S-91255A724 1/2"-13 x 2 1/2" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance in demanding industrial applications, preventing fastener failure under high stress.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh environments and reducing maintenance needs.
• High-precision Class 3A thread fit guarantees secure, vibration-resistant connections with minimal risk of loosening in critical assemblies.
• Easy installation and removal with a 5/16" hex drive and button head design, allowing for efficient assembly with standard tools in confined spaces.
• Full threading and UNC coarse spacing provide faster driving and superior holding power in a wide range of materials, from metal to composite.
• Compliance with major industry standards including ASME B18.3 and ASTM F835, ensuring consistent quality and reliability for engineering projects.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements for hazardous substances.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this black-oxide alloy steel button head screw delivers exceptional durability where corrosion resistance and high tensile strength are critical. The fully threaded UNC coarse spacing and Class 3A thread fit ensure rapid installation and superior grip in materials prone to vibration, such as machinery frames, automotive components, and structural assemblies. The rounded button head with hex drive provides a low-profile, secure fastening solution that withstands rigorous operational stresses while maintaining a clean aesthetic. Ideal for OEM manufacturing and MRO operations, it addresses common challenges like fastener stripping, thread wear, and environmental degradation, offering long-term reliability in demanding conditions.

Specification Summary & Compliance

This screw features a 1/2"-13 UNC thread with Class 3A fit and coarse spacing, ensuring precise dimensional accuracy for secure fastening. Manufactured from alloy steel with a black-oxide surface treatment, it meets ASME B18.3 and ASTM F835 specifications for consistent performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to environmental and safety standards for industrial use.