S-91900A572 1/4"-28 x 1" 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 tamper resistance with T27 Torx drive prevents unauthorized removal in high-security environments
- Superior corrosion resistance through 18-8 stainless steel construction and passivated finish for extended service life
- Precise Class 3A thread fit ensures reliable engagement and vibration resistance in critical assemblies
- High tensile strength (70,000 psi) provides exceptional load-bearing capacity for demanding applications
- Rounded button head design offers a low-profile, finished appearance while minimizing snag hazards
- Full threading along 1" length delivers maximum grip and holding power throughout the fastener
- Regulatory compliance with ASME B18.3, RoHS, and REACH standards ensures quality and environmental safety
Professional Applications & Engineering Value
This 1/4"-28 UNF rounded head tamper-resistant Torx screw addresses critical industrial challenges where security, corrosion resistance, and reliability are paramount. The 18-8 stainless steel material combined with passivated finish provides exceptional protection against harsh environments, making it ideal for outdoor equipment, marine applications, and chemical processing facilities. The tamper-resistant T27 drive system prevents unauthorized access in public infrastructure, transportation, and security systems. With its Class 3A fine thread spacing and fully threaded design, this fastener maintains consistent clamping force in vibration-prone assemblies while the rounded button head profile reduces stress concentration points for improved fatigue resistance.
Specification Summary & Compliance
Manufactured to precise Class 3A thread fit standards with 1/4"-28 UNF fine thread spacing and right-hand threading. The fastener meets ASME B18.3 dimensional specifications and demonstrates 70,000 psi tensile strength with Rockwell B70 hardness. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and restricted substance management for global industrial applications.
