S-90484A135 8-32 x 1/4" ASME B18.3, ASTM F835 Tamper-Resistant Hex-Drive Steel Button Head Screws

Key Features & Benefits at a Glance

• Superior tamper resistance with specialized hex drive requiring matching tools, enhancing security in public or restricted-access installations
• Exceptional durability and corrosion resistance from black-oxide coated alloy steel, ideal for harsh industrial environments
• High-load bearing capacity with 130,000 psi tensile strength and Rockwell C39 hardness for demanding mechanical applications
• Precise thread engagement with Class 3A fit ensuring reliable fastening and vibration resistance in machinery assemblies
• Optimized installation efficiency through fully threaded coarse UNC design for faster driving and reduced cross-threading risks
• Low-profile rounded head design providing smooth finished appearance while minimizing snagging hazards
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global quality and environmental requirements

Professional Applications & Engineering Value

Engineered for critical industrial applications, these 8-32 UNC thread rounded head screws deliver exceptional performance where vibration resistance and tamper-proof security are paramount. The black-oxide alloy steel construction provides superior corrosion protection without compromising the 130,000 psi tensile strength, making them ideal for machinery assemblies, electronic enclosures, and automotive components exposed to demanding operating conditions. The tamper-resistant hex drive prevents unauthorized access in public infrastructure or sensitive equipment, while the fully threaded coarse spacing design ensures rapid installation and reliable holding power in both metallic and composite materials. These Class 3A thread fit fasteners maintain precise tolerances throughout their service life, reducing maintenance frequency and downtime in production environments.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread fit tolerances with UNC coarse thread spacing and right-hand threading. Complies with ASME B18.3 dimensional specifications (ASTM F835) and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features include: 8-32 thread size, 1/4" length, 5/32" tamper-resistant hex drive, and 0.312" head diameter with standard button profile.