S-91870A759 5/16"-18 x 2 1/4" ASME B18.3 Tamper-Resistant Torx Stainless Steel Flat Head Screws
Tamper-Resistant Torx Stainless 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 T40 Torx drive prevents unauthorized removal, ideal for public or high-security installations.
- Superior Corrosion Resistance: 18-8 stainless steel construction with passivated finish ensures long-term durability in harsh or outdoor environments.
- High Mechanical Strength: 70,000 psi tensile strength and Rockwell B70 hardness provide reliable performance under heavy loads and vibration.
- Precision Thread Fit: Class 3A UNC coarse threads ensure secure, tight fastening with reduced risk of cross-threading in industrial assemblies.
- Optimal Flush Mounting: Standard 82° countersink angle allows the flat head to sit seamlessly flush with surfaces for a clean, professional finish.
- Full Thread Engagement: Fully threaded design maximizes grip length and distributes stress evenly for stronger, more durable connections.
- Regulatory Compliance: Meets ASME B18.3 specifications and is RoHS 3/REACH compliant, ensuring safety and environmental standards are upheld.
Professional Applications & Engineering Value
Engineered for demanding industrial and commercial settings, these 18-8 stainless steel flat head screws combine robust tamper-resistant Torx drive security with exceptional corrosion resistance from the passivated finish. The Class 3A thread fit and coarse UNC threading provide quick, reliable installation in metal, wood, or composite materials, reducing assembly time while preventing tampering in public fixtures, machinery guards, or transportation equipment. With a high tensile strength of 70,000 psi, they withstand dynamic loads and vibrations, making them ideal for security panels, industrial enclosures, and outdoor structures where durability and unauthorized access prevention are critical.
Specification Summary & Compliance
This screw features a 5/16"-18 UNC coarse thread with Class 3A precision tolerance for secure fit, and is fully threaded for maximum holding power. It complies with ASME B18.3 dimensional standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it is free of hazardous substances and suitable for global industrial use.
