S-91900A611 5/16"-18 x 1 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
- Superior tamper resistance with specialized Torx T40 drive to prevent unauthorized access in secure environments
- Exceptional corrosion protection through 18-8 stainless steel construction and passivated surface treatment
- Reliable high-strength performance with 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
- Precision thread engagement with Class 3A thread fit ensuring secure fastening and vibration resistance
- Optimized installation efficiency through UNC coarse threading and fully threaded design for faster assembly
- Enhanced durability with rounded button head profile that resists snagging and provides a finished appearance
- Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH
Professional Applications & Engineering Value
This tamper-resistant Torx screw delivers critical security and performance in industrial settings where unauthorized access prevention is paramount. The 18-8 stainless steel composition combined with passivated finish creates a robust barrier against corrosive elements, making it ideal for outdoor equipment, marine applications, and harsh manufacturing environments. The Class 3A thread fit with UNC coarse spacing ensures rapid installation while maintaining superior holding power in materials where vibration resistance is essential. Engineering teams specify this T40 drive security screw for access panels, public infrastructure, electrical enclosures, and machinery where both tamper-proof characteristics and corrosion resistance are required for long-term reliability.
Specification Summary & Compliance
This fastener features precision 5/16"-18 UNC coarse threads with Class 3A thread fit for optimal engagement and meets ASME B18.3 dimensional specifications. Manufacturing compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The fully threaded design with 1-1/4" length provides consistent fastening performance across the entire shank, while the rounded button head profile with 0.547" diameter offers both aesthetic appeal and functional clearance.
