S-91900A921 1/4"-20 x 2 1/4" 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, preventing unauthorized removal in public or high-security environments
- Superior corrosion resistance from 18-8 stainless steel construction and passivated finish, ideal for harsh industrial conditions
- High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing applications
- Precise thread engagement ensured by Class 3A fit and UNC coarse threading, reducing cross-threading risks
- Full-threaded design maximizes grip length and distribution of clamping force across the entire 2-1/4" length
- Low-profile rounded button head provides a finished appearance while minimizing snagging hazards
- Regulatory compliance with ASME B18.3, RoHS 3, and REACH for global industrial acceptance
Professional Applications & Engineering Value
Engineered for high-security industrial applications, these tamper-resistant Torx rounded head screws address critical needs in public infrastructure, machinery guarding, and access panels where unauthorized tampering poses safety risks. The 18-8 stainless steel material combined with a passivated finish delivers exceptional corrosion resistance in humid, chemical, or outdoor environments, reducing maintenance frequency. The fully threaded UNC coarse design ensures rapid installation and high vibration resistance, while the Class 3A thread fit maintains precise tolerances for consistent performance in heavy-duty assembly scenarios requiring reliable fastening under dynamic loads.
Specification Summary & Compliance
This 1/4"-20 x 2-1/4" screw features UNC coarse threads with Class 3A tolerance for superior thread engagement. Manufacturing adheres to ASME B18.3 specifications, ensuring dimensional accuracy and mechanical reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances for safe use in regulated industries.
