S-97870A192 M4 x 8 mm Sealing Tamper-Resistant Torx Flat Head Screws

Key Features & Benefits at a Glance

• Superior Sealing Performance: Integrated Buna-N rubber O-ring creates a reliable seal, preventing leaks in pressurized systems up to 1500 psi.
• Enhanced Tamper Resistance: Tamper-resistant Torx T20 drive deters unauthorized access, ideal for public or high-security installations.
• Excellent Corrosion Resistance: Made from 18-8 stainless steel with a passivated finish for long-lasting durability in harsh environments.
• Optimized for Flush Mounting: Flat head with undercut profile allows for a smooth, countersunk finish that minimizes protrusion.
• Broad Temperature Tolerance: Buna-N O-ring maintains sealing integrity across a wide range from -40° to 225° F.
• High Tensile Strength: Withstands up to 70,000 psi, ensuring a secure, vibration-resistant hold in demanding applications.
• Precision Thread Fit: Class 6g coarse threading ensures easy installation and reliable engagement in metric tapped holes.

Professional Applications & Engineering Value

This M4 flat head screw is engineered for industrial applications where both security and sealing are critical. The combination of 18-8 stainless steel and a passivated finish provides excellent resistance to corrosion, making it suitable for outdoor, marine, or chemical-exposed environments. The integrated Buna-N rubber O-ring effectively seals against dust, moisture, and fluids, preventing system failures in machinery, electrical enclosures, and fluid handling systems. The tamper-resistant Torx drive (T20) adds a layer of security, deterring tampering in public infrastructure, transportation, or sensitive equipment. Its undercut flat head design ensures a flush fit, reducing snagging risks and improving aesthetic integration. Fully threaded for maximum grip, this metric sealing fastener delivers reliable performance under pressures up to 1500 psi, solving common leakage and unauthorized access issues in professional settings.

Specification Summary & Compliance

This fastener features a metric M4 x 0.7mm coarse thread with a Class 6g tolerance for precise fit, and is fully threaded for consistent holding power. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated industries. The screw is manufactured to exact specifications, including a 90° countersink angle and an 8mm length, providing reliable performance in standard metric applications.