S-97870A195 M4 x 16 mm Sealing Tamper-Resistant Torx Flat Head Screws

Key Features & Benefits at a Glance

• Superior tamper resistance with the specialized T20 Torx drive, preventing unauthorized access in secure applications.
• Reliable pressure sealing up to 1500 psi thanks to the integrated Buna-N rubber O-ring, ideal for fluid and gas containment systems.
• Excellent corrosion resistance from 18-8 stainless steel with a passivated finish, ensuring long-term durability in harsh environments.
• High tensile strength of 70,000 psi provides a robust and dependable fastening solution for demanding mechanical assemblies.
• Precise Class 6g thread fit ensures smooth installation and secure engagement in metric coarse threaded holes.
• Undercut flat head design allows for a flush, low-profile finish that enhances aesthetics and prevents snagging.
• Compliance with RoHS 3 and REACH guarantees the screw meets stringent international environmental and safety regulations.

Professional Applications & Engineering Value

This M4 flat head screw is engineered to solve critical challenges in industrial and security-focused applications. The combination of 18-8 stainless steel and a passivated finish offers exceptional resistance to rust and chemical exposure, making it ideal for outdoor equipment, marine hardware, and chemical processing plants. The tamper-resistant Torx drive (T20) deters vandalism and unauthorized disassembly in public infrastructure, electronic enclosures, and access panels. Furthermore, the integrated Buna-N rubber O-ring provides a reliable seal against dust, moisture, and pressures up to 1500 psi, which is crucial for hydraulic systems, pneumatic devices, and automotive components. Its fully threaded metric coarse thread ensures maximum grip and vibration resistance, reducing maintenance needs and enhancing operational safety in dynamic environments.

Specification Summary & Compliance

This fastener features a M4 x 0.7 mm metric coarse thread with a Class 6g tolerance for precise fit, a length of 16 mm, and an undercut flat head with a 90° countersink angle. It is manufactured from 18-8 stainless steel with a passivated surface treatment and includes a Buna-N rubber O-ring rated for temperatures from -40° to 225° F. The screw is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for various industrial uses.