S-96669A203 4-40 x 1/2" ASME B18.3 Sealing Tamper-Resistant Torx Flat Head Screws
Sealing Tamper-Resistant Torx Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
Installation & Application
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Key Features & Benefits at a Glance
- Superior Sealing Performance: Buna-N rubber O-ring provides reliable sealing up to 1500 psi, preventing leaks in high-pressure industrial environments.
- Enhanced Tamper Resistance: Tamper-resistant Torx T8 drive deters unauthorized access, ideal for secure applications in public or restricted areas.
- Excellent Corrosion Resistance: 18-8 stainless steel construction with passivated finish ensures long-term durability in harsh, corrosive conditions.
- Optimized Head Design: Undercut flat head allows for flush mounting, reducing protrusion and improving aesthetics in finished assemblies.
- Consistent Thread Engagement: Class 2A thread fit with coarse UNC threading ensures easy installation and reliable holding power.
- Wide Temperature Tolerance: O-ring functions effectively from -40 to 225°F, maintaining seal integrity across diverse operating environments.
- High Tensile Strength: 70000 psi tensile strength provides robust mechanical performance for demanding applications.
Professional Applications & Engineering Value
These 4-40 UNC flat head screws with integrated Buna-N rubber O-rings solve critical sealing challenges in industrial equipment, electronic enclosures, and fluid systems. The tamper-resistant Torx T8 drive prevents unauthorized disassembly while the undercut flat head design ensures smooth, flush surfaces. Manufactured from 18-8 stainless steel with passivated finish, these screws resist corrosion in humid or chemical-exposed environments. The coarse thread configuration and Class 2A thread fit enable quick installation with consistent torque performance, reducing assembly time while maintaining pressure integrity up to 1500 psi - making them ideal for pneumatic systems, hydraulic components, and outdoor machinery requiring reliable, long-term sealing solutions.
Specification Summary & Compliance
These fully threaded screws feature 4-40 UNC coarse threads with Class 2A thread fit for precision engagement. Manufacturing complies with ASME B18.3 specifications, ensuring dimensional accuracy and performance reliability. The products are RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety standards for industrial use.
