S-91255A278 10-32 x 2" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating protecting against rust in demanding industrial environments
• Exceptional tensile strength of 120,000 psi ensures reliable performance under high-stress applications
• Precision Class 3A thread fit provides tighter tolerances for secure fastening and vibration resistance
• Optimized partial threading allows for controlled clamping force and reduced material stress
• Rockwell C39 hardness delivers excellent wear resistance and long-term durability
• 1/8" hex drive design enables quick installation and removal with standard tools
• Fine UNF thread spacing ensures superior holding power in metal-to-metal applications

Professional Applications & Engineering Value

These 10-32 UNF black-oxide alloy steel rounded head screws are engineered to address critical industrial fastening challenges where corrosion resistance and high tensile strength are paramount. The black-oxide surface treatment creates a protective barrier against moisture and chemical exposure, significantly extending service life in harsh environments. The Class 3A thread fit with fine UNF threading provides superior vibration resistance, making these rounded head screws ideal for precision machinery, automotive assemblies, and electronic enclosures where loosening under dynamic loads is a concern. The partial threading design allows for precise clamp load distribution, preventing damage to sensitive components while maintaining secure fastening in industrial applications requiring repeated maintenance access.

Specification Summary & Compliance

These screws feature precision Class 3A thread fit with 10-32 UNF fine thread spacing and partial threading up to 7/8" minimum thread length. Manufactured to exacting standards including ASME B18.3 and ASTM F835 specifications. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. The black-oxide alloy steel construction maintains dimensional stability with Rockwell C39 hardness and 120,000 psi tensile strength for consistent performance in critical applications.