S-96075A104 4-40 x 3/8" ASME B18.3 Tamper-Resistant Torx Steel Button Head Screws

Key Features & Benefits at a Glance

• Superior tamper resistance with T8 Torx drive design to prevent unauthorized access in secure environments
• Exceptional corrosion protection through black-oxide coating that withstands harsh industrial conditions
• High-reliability fastening with 130,000 psi tensile strength and Rockwell C38 hardness for demanding applications
• Precise thread engagement with Class 3A thread fit ensuring consistent performance and vibration resistance
• Enhanced installation efficiency through coarse UNC threading and fully threaded design for faster assembly
• Comprehensive compliance assurance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH
• Optimized head design with rounded button profile providing smooth surface finish and reduced snagging

Professional Applications & Engineering Value

These 4-40 UNC black-oxide alloy steel screws deliver critical performance advantages in industrial settings where security, durability, and precision are paramount. The tamper-resistant T8 Torx drive addresses security concerns in public infrastructure, electronic enclosures, and machinery requiring controlled access. The black-oxide surface treatment provides essential corrosion resistance without compromising dimensional accuracy, making these rounded head screws ideal for outdoor equipment, automotive assemblies, and electronic cabinets exposed to environmental challenges. With Class 3A thread fit and coarse threading, installation time is reduced while maintaining vibration resistance in high-stress applications. The combination of 130,000 psi tensile strength and fully threaded design ensures maximum holding power across the entire fastener length, solving common failure points in mechanical assemblies.

Specification Summary & Compliance

These screws feature precision 4-40 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy and consistent performance. Manufacturing complies with ASME B18.3 specifications for dimensional standards and quality assurance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring restricted substance compliance for global industrial applications. The right-hand thread direction and fully threaded configuration provide standardized installation across various assembly requirements.