S-96669A199 4-40 x 1/4" ASME B18.3 Sealing Tamper-Resistant Torx Flat Head Screws
Sealing Tamper-Resistant Torx Flat Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
Installation & Application
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Enhanced security and tamper resistance with specialized Torx T8 drive that deters unauthorized access
- Reliable pressure sealing up to 1500 psi using integrated Buna-N rubber O-ring for leak-proof performance
- Superior corrosion resistance from 18-8 stainless steel construction with passivated surface treatment
- Wide temperature compatibility with O-ring functionality maintained from -40°F to 225°F
- Precise thread engagement with UNC coarse threads and Class 2A fit for secure fastening
- Optimized flush mounting through undercut flat head design with 82° countersink angle
- High tensile strength of 70,000 psi for demanding industrial applications
Professional Applications & Engineering Value
This 4-40 UNC flat head screw delivers critical engineering solutions where security and sealing integrity are paramount. The combination of tamper-resistant Torx drive and Buna-N rubber O-ring addresses two common industrial challenges: unauthorized tampering and fluid/gas leakage under pressure. Manufactured from 18-8 stainless steel with passivated finish, these screws resist corrosion in harsh environments while maintaining sealing performance across wide temperature fluctuations. The undercut flat head profile ensures proper seating in countersunk applications, making these security screws ideal for access panels, fluid systems, and equipment housings requiring both protection and environmental sealing.
Specification Summary & Compliance
This fastener features 4-40 UNC coarse threads with Class 2A fit for standard industrial applications. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industries. Thread direction is right-hand with full threading along the 1/4" length, designed for maximum hole diameter of 0.127".
