S-91255A155 6-32 x 1 1/4" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide coating on Alloy Steel, extending service life in demanding environments
• Exceptional mechanical strength with 120,000 psi tensile strength and Rockwell C39 hardness for reliable load-bearing performance
• Precise thread engagement with Class 3A fit and UNC coarse threads ensuring vibration resistance and secure fastening
• Optimized installation control using 5/64" hex drive with rounded button head design for reduced protrusion and tool accessibility
• Controlled thread engagement through partial threading design preventing over-tightening in sensitive assemblies
• Regulatory compliance assurance meeting ASME B18.3, ASTM F835, RoHS 3 and REACH standards for global industrial applications
• Versatile right-hand threading with standard coarse spacing for quick assembly in various materials and conditions

Professional Applications & Engineering Value

Engineered for industrial machinery, electronic enclosures, and precision equipment assemblies, these Black-Oxide Alloy Steel rounded head screws address critical fastening challenges. The 6-32 UNC coarse thread configuration provides excellent pull-out resistance in metallic and composite materials, while the partial threading design prevents damage to sensitive components by controlling engagement depth. The hex drive system ensures reliable torque transmission during installation, and the rounded button head profile minimizes snagging hazards in moving parts. Combined with 120,000 psi tensile strength and Rockwell C39 hardness, these screws deliver consistent performance in high-vibration environments where fastener integrity is paramount for operational safety and reduced maintenance intervals.

Specification Summary & Compliance

This 1-1/4" length screw features precision Class 3A thread fit with UNC coarse thread spacing and 0.138" thread diameter, manufactured to exacting dimensional standards. Compliance is verified with ASME B18.3 for dimensional requirements and ASTM F835 for mechanical properties. Environmental regulations adherence includes RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance regarding substance restrictions, ensuring suitability for global industrial supply chains and sensitive applications.