S-90484A139 8-32 x 1/2" 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 design that prevents unauthorized removal in secure environments
• Exceptional corrosion protection through black-oxide coating that extends service life in demanding industrial conditions
• High-strength performance with 130,000 psi tensile strength and Rockwell C39 hardness for reliable fastening under heavy loads
• Precision thread engagement with Class 3A fit ensuring consistent, vibration-resistant connections in critical assemblies
• Optimized head design featuring rounded button profile that provides smooth surface finish and reduced snagging
• Full regulatory compliance meeting ASME B18.3 specifications and environmental standards for global industrial applications
• Complete threading coverage along the 1/2" length enables maximum grip and uniform stress distribution

Professional Applications & Engineering Value

These 8-32 UNC thread screws with tamper-resistant hex drive address critical security and reliability challenges in industrial settings. The black-oxide alloy steel construction provides superior corrosion resistance while maintaining the high tensile strength required for vibration-prone applications. The Class 3A thread fit ensures precise engagement in machinery, electronic enclosures, and public infrastructure where unauthorized access prevention is paramount. The rounded button head design minimizes protrusion risks while the specialized drive system deters tampering in security-sensitive installations. These screws deliver engineering confidence for applications requiring both mechanical performance and access control.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 standards with Class 3A thread fit for superior precision. Features 8-32 UNC coarse threads with right-hand direction and full threading along the 1/2" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The black-oxide surface treatment on alloy steel substrate provides consistent performance within specified hardness (Rockwell C39) and tensile strength (130,000 psi) parameters for industrial applications.