S-91870A776 1/4"-20 x 3/4" 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 tamper resistance with Torx Plus IPR27 drive for superior security in restricted-access environments
- Exceptional durability from alloy steel construction with 160,000 psi tensile strength for heavy-duty applications
- Reliable corrosion protection through black oxide finish extending service life in industrial conditions
- Precision thread engagement with Class 2A UNC coarse threads ensuring consistent fastening performance
- Optimized flush mounting through standard 82° flat head profile for seamless surface integration
- Consistent mechanical properties with Rockwell C38 hardness maintaining structural integrity under stress
- Full-threaded design providing maximum grip length and load distribution across the entire fastener
Professional Applications & Engineering Value
This tamper-resistant flat head screw delivers critical security and performance advantages for industrial applications where unauthorized access prevention is paramount. The alloy steel construction combined with black oxide finish provides exceptional resistance to corrosion and wear in demanding environments such as public infrastructure, machinery guarding, and electronic enclosures. The Torx Plus IPR27 drive system ensures reliable installation torque transfer while deterring tampering attempts. With fully threaded UNC coarse threads and Class 2A fit, these security fasteners maintain consistent clamping force in vibration-prone applications, making them ideal for manufacturing equipment, transportation systems, and secure facility installations where both performance and protection are engineering priorities.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse threading (1/4"-20) ensuring interchangeability and proper engagement. Complies with ASME B18.3 specifications for dimensional accuracy and mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance for restricted substance control. The 82° countersink angle conforms to standard flat head profiles for proper seating in chamfered holes.
