S-91900A551 1/4"-20 x 2 1/2" ASME B18.3 Tamper-Resistant Torx Stainless Steel Button Head Screws
Tamper-Resistant Torx Stainless 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
- Enhanced Security with tamper-resistant Torx T27 drive to prevent unauthorized access in public or high-risk environments
- Superior Corrosion Resistance from 18-8 stainless steel construction and passivated finish for long-term reliability in harsh conditions
- High Mechanical Strength delivering 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
- Precision Thread Engagement with Class 3A UNC coarse threads ensuring secure fastening and vibration resistance
- Full Thread Coverage along the 2-1/2" length for maximum grip strength and load distribution
- Low-Profile Installation with rounded button head design that minimizes protrusion while maintaining structural integrity
- Regulatory Compliance meeting ASME B18.3 standards with RoHS 3 and REACH environmental directives
Professional Applications & Engineering Value
These tamper-resistant Torx rounded head screws provide critical security solutions for industrial equipment, public infrastructure, and access panels where unauthorized tampering poses safety risks. The 18-8 stainless steel material combined with passivated finish creates exceptional corrosion resistance, making them ideal for outdoor applications, marine environments, and chemical processing facilities. The Class 3A thread fit and UNC coarse threading ensure rapid installation with superior vibration resistance, while the T27 security drive system deters tampering without compromising torque transmission. These fully threaded screws maintain consistent clamping force across the entire 2-1/2" length, providing reliable performance in structural assemblies, machinery guards, and security enclosures where durability and access control are paramount.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 3A thread fit tolerance and UNC 1/4"-20 coarse threading. Complies with ASME B18.3 mechanical specifications, RoHS 3 (2015/863/EU) hazardous substances restriction, and REACH (EC 1907/2006) chemical registration requirements. The passivated finish on 18-8 stainless steel provides enhanced corrosion protection while maintaining the material's inherent strength characteristics.
