S-95635A671 M4 x 8 mm ASTM F879M Tamper-Resistant Hex-Drive Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced Security: Tamper-resistant hex drive prevents unauthorized removal, ideal for public or high-security installations.
• Superior Corrosion Resistance: Made from 18-8 Stainless Steel with a passivated finish for excellent durability in harsh or outdoor environments.
• High Mechanical Strength: With a tensile strength of 80,000 psi and a hardness of Rockwell B96, it ensures reliable performance under significant load and stress.
• Precision Threading: Features a Class 6g thread fit and coarse M4 x 0.7mm pitch for easy, secure installation and vibration resistance.
• Streamlined Assembly: The rounded button head provides a low-profile, finished appearance and reduces snagging risks.
• Full Thread Engagement: Being fully threaded along the 8mm length maximizes grip and holding power in various materials.
• Regulatory Assurance: Compliant with ASTM F879M, RoHS 3, and REACH standards, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This M4 metric screw is engineered to address critical challenges in industrial and commercial settings where security, corrosion resistance, and mechanical integrity are paramount. The 18-8 Stainless Steel construction, enhanced by a passivated finish, provides long-term protection against rust and chemical exposure, making it suitable for outdoor equipment, marine applications, and food processing machinery. The tamper-resistant hex drive is a key security feature, deterring vandalism and unauthorized access in public infrastructure, electronic enclosures, and transportation systems. Its fully threaded design with a coarse thread pitch ensures rapid installation and high pull-out strength in metals and plastics, reducing assembly time while maintaining 80,000 psi tensile strength for demanding mechanical fastening tasks.

Specification Summary & Compliance

This screw features precise M4 x 0.7mm coarse threads with a Class 6g thread fit per metric standards, ensuring dimensional accuracy and compatibility. It is manufactured in compliance with ASTM F879M specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming it is free from hazardous substances and safe for various industrial and consumer applications.