S-91870A767 1/4"-20 x 1/2" ASME B18.3 Tamper-Resistant Torx Steel Flat Head Screws
Tamper-Resistant Torx Steel Flat 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
- Enhanced tamper resistance with specialized Torx T27 drive for superior security in high-risk environments
- Exceptional 160,000 psi tensile strength from alloy steel construction for heavy-duty industrial applications
- Corrosion-resistant black oxide finish extends service life in demanding operating conditions
- Precise Class 2A thread fit ensures reliable engagement and vibration resistance in UNC coarse threading
- Optimized 82° countersink angle with undercut head profile provides flush mounting without protrusion
- Full threading along 1/2" length delivers maximum grip strength across the entire fastener
- Rockwell C38 hardness rating maintains structural integrity under repeated stress and load
Professional Applications & Engineering Value
Engineered for critical industrial security applications, these flat head screws address common maintenance and vandalism concerns through their tamper-resistant Torx drive system. The alloy steel construction combined with black oxide surface treatment creates a durable fastener capable of withstanding harsh environmental conditions while maintaining 160,000 psi tensile strength. The undercut flat head design with 82° countersink ensures seamless flush installation in machinery, electronic enclosures, and public infrastructure where protrusion poses safety or operational hazards. The UNC coarse threading with Class 2A fit provides rapid installation and reliable performance in vibration-prone assemblies, making these security screws ideal for manufacturing equipment, transportation systems, and access control panels.
Specification Summary & Compliance
This 1/4"-20 x 1/2" flat head screw features precise Class 2A thread fit according to UNC standards with complete threading throughout its length. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance requirements. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations regarding chemical safety, ensuring environmental responsibility in industrial supply chains.
