S-91255A714 1/2"-13 x 1 1/4" 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 applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 3A thread fit guarantees secure, vibration-resistant connections, enhancing assembly integrity and safety.
• High hardness rating (Rockwell C39) provides excellent wear resistance, maintaining thread integrity through repeated use.
• Fully threaded UNC coarse design allows for faster installation and superior grip in a wide range of materials.
• 5/16" hex drive with button head offers easy installation with standard tools while providing a low-profile, finished appearance.
• Compliance with major industry standards including ASME B18.3 and ASTM F835 ensures consistent quality and reliability.

Professional Applications & Engineering Value

These black-oxide alloy steel button head screws deliver critical engineering advantages for industrial applications where strength, corrosion resistance, and precise fit are paramount. The combination of 120,000 psi tensile strength and Rockwell C39 hardness makes them ideal for heavy machinery, automotive assemblies, and structural frameworks where vibration and dynamic loads are concerns. The fully threaded UNC coarse spacing ensures maximum engagement in both metallic and composite materials, while the black-oxide surface treatment provides essential protection against rust and chemical exposure in manufacturing environments. These hex drive screws with their rounded head profile are particularly valuable in applications requiring flush mounting without sacrificing installation torque capability.

Specification Summary & Compliance

This 1/2"-13 x 1-1/4" button head screw features Class 3A thread fit precision with UNC coarse thread spacing and right-hand threading. Manufactured to ASME B18.3 and ASTM F835 specifications, it ensures dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry standards for hazardous substance restrictions.