S-90484A539 1/4"-20 x 5/8" ASME B18.3, ASTM F835 Tamper-Resistant Hex-Drive Steel Button Head Screws
Tamper-Resistant Hex-Drive Steel Button Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior tamper resistance with specialized hex drive design to prevent unauthorized removal in high-security environments
- Exceptional corrosion protection through black-oxide coating that withstands harsh industrial conditions
- Maximum load-bearing capacity with 130,000 psi tensile strength for critical structural applications
- Precision thread engagement through Class 3A fit ensuring reliable fastening in vibration-prone settings
- Enhanced durability from Rockwell C39 hardness maintaining performance under repeated stress
- Quick installation efficiency with UNC coarse threading reducing assembly time and effort
- Full regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
These tamper-resistant hex screws provide engineered security solutions for demanding industrial applications where unauthorized access prevention is critical. The black-oxide alloy steel construction delivers superior corrosion resistance in challenging environments, while the Class 3A thread fit ensures precise engagement that withstands vibration in machinery, electrical enclosures, and public infrastructure. The rounded button head profile combines security with a low-profile design, making these fully threaded UNC fasteners ideal for security panels, access control systems, and industrial equipment requiring both high strength and tamper-proof characteristics. With 130,000 psi tensile strength, they maintain structural integrity in high-stress applications where standard fasteners would fail.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread tolerances with UNC coarse spacing (1/4"-20) and full threading along the 5/8" length. Complies with ASME B18.3 specifications where identified as ASTM F835, ensuring consistent quality and performance. Meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) standards for chemical safety, validated through the June 14, 2023 SVHC assessment. The black-oxide surface treatment enhances corrosion resistance while maintaining the alloy steel's inherent strength characteristics.
