S-91900A858 M5 x 20 mm ASTM F879M, ISO 7380 Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced Security: Tamper-resistant T25 Torx drive prevents unauthorized removal, ideal for public or high-security installations.
• Superior Corrosion Resistance: Passivated 18-8 stainless steel finish ensures long-term durability in harsh environments, reducing maintenance costs.
• High Tensile Strength: 80,000 psi tensile strength and Rockwell B96 hardness provide reliable performance under heavy loads and vibration.
• Precision Threading: Fully threaded M5 x 0.8 mm coarse pitch with Class 6g fit ensures easy installation and secure fastening in metric applications.
• Low-Profile Design: Rounded button head with 9.5 mm diameter and 2.74 mm height offers a sleek appearance while minimizing snagging risks.
• Broad Compliance: Meets ASTM F879M and ISO 7380 standards, ensuring consistent quality and interchangeability in global industrial projects.
• Environmental Safety: RoHS 3 and REACH compliant, supporting sustainable and safe manufacturing practices.

Professional Applications & Engineering Value

This M5 metric screw with a tamper-resistant Torx drive and 18-8 stainless steel construction addresses critical needs in industrial and security-focused settings. The passivated finish significantly enhances corrosion resistance, making it suitable for outdoor machinery, marine equipment, and chemical processing plants where moisture and corrosive agents are prevalent. Its fully threaded design and Class 6g thread fit ensure rapid, vibration-resistant assembly in metal, plastic, or composite materials, reducing installation time and improving joint integrity. Engineers value the rounded head profile for applications requiring a smooth surface to prevent injury or interference, such as in consumer electronics, automotive panels, and public infrastructure. By combining security features with high tensile strength, this screw mitigates theft, tampering, and mechanical failure, delivering long-term reliability in demanding industrial fasteners applications.

Specification Summary & Compliance

This product features precise metric threading with M5 x 0.8 mm coarse pitch and Class 6g thread fit for consistent engagement. It adheres to ASTM F879M and ISO 7380 manufacturing specifications, ensuring dimensional accuracy and performance reliability. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms the absence of hazardous substances, supporting environmental and safety standards in global supply chains.