S-91870A778 1/4"-20 x 1 1/4" ASME B18.3 Tamper-Resistant Torx Plus Steel Flat Head Screws
Tamper-Resistant Torx Plus 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 Security: Tamper-resistant Torx Plus drive prevents unauthorized removal, ideal for public or high-security applications
- Superior Strength: 160,000 psi tensile strength and Rockwell C38 hardness provide exceptional load-bearing capacity for demanding industrial use
- Optimal Fit & Engagement: Class 3A thread fit ensures precise, vibration-resistant connections in critical assemblies
- Maximum Holding Power: Fully threaded design distributes clamping force evenly across the entire 1 1/4" length
- Corrosion Resistance: Black oxide finish protects against rust and extends service life in harsh environments
- Streamlined Installation: 82° countersink angle and standard flat head profile sit flush with surfaces for clean, professional finishes
- Industry Compliance: Meets ASME B18.3 specifications and environmental standards (RoHS 3, REACH) for reliable, regulated performance
Professional Applications & Engineering Value
These 1/4"-20 UNC flat head screws with tamper-resistant Torx Plus drive address critical engineering challenges in industrial settings. The alloy steel construction and black oxide finish combine to resist corrosion and wear, making them ideal for machinery, electronic enclosures, and outdoor equipment where unauthorized access is a concern. The Class 3A thread fit and fully threaded design ensure maximum engagement and vibration resistance, preventing loosening in high-stress applications. With their 82° countersink angle, they provide a flush mount that eliminates protrusions, enhancing safety and aesthetics in finished products while maintaining 160,000 psi tensile strength for heavy-duty fastening requirements.
Specification Summary & Compliance
This fastener features 1/4"-20 UNC coarse threads with Class 3A fit for precision threading applications. Manufactured to ASME B18.3 specifications with Rockwell C38 hardness and 160,000 psi tensile strength. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards for safe industrial use.
