S-92178A167 M4 x 25 mm ASTM F879M, ISO 7380 Sealing Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ensuring long-term reliability in harsh environments.
• Enhanced tamper-proof security through the Torx T15 drive, preventing unauthorized access in sensitive applications.
• Reliable high-pressure sealing up to 1500 psi with the integrated Buna-N rubber O-ring, minimizing fluid or gas leakage risks.
• Broad temperature adaptability from -40° to 225° F, maintaining performance in extreme thermal conditions.
• High mechanical strength with 100,000 psi tensile strength and Rockwell B96 hardness, reducing failure risks under heavy loads.
• Precise thread engagement via Class 6g metric coarse threading, ensuring consistent fastening and vibration resistance.
• Streamlined installation with a fully threaded design and rounded button head, allowing for flush mounting and reduced assembly time.

Professional Applications & Engineering Value

This M4 metric screw is engineered to address critical sealing and durability challenges in industrial settings. The passivated 18-8 stainless steel material provides excellent corrosion resistance, ideal for outdoor, chemical, or marine applications where moisture and contaminants are prevalent. The Buna-N rubber O-ring creates a robust seal against fluids and gases, supporting systems operating at up to 1500 psi, such as hydraulic assemblies, pneumatic controls, or pressurized enclosures. The tamper-resistant Torx T15 drive enhances security in public infrastructure or machinery requiring restricted access. With a fully threaded design and Class 6g thread fit, it ensures reliable engagement in pre-tapped holes, reducing loosening from vibrations in automotive, electronics, or heavy equipment. This combination of sealing capability, material integrity, and secure drive makes it a versatile solution for engineers prioritizing leak prevention and long-term fastener performance.

Specification Summary & Compliance

This screw adheres to metric threading standards with M4 x 0.7 mm coarse pitch and Class 6g thread fit for precise dimensional accuracy. It meets ASTM F879M and ISO 7380 specifications, ensuring consistent manufacturing quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances for safe use in global markets.