S-91900A851 M4 x 10 mm ASTM F879M, ISO 7380 Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced security protection with tamper-resistant T15 Torx drive that prevents unauthorized access in public or high-risk environments
• Superior corrosion resistance through 18-8 stainless steel construction and passivated surface treatment for extended service life in harsh conditions
• High mechanical reliability with 80,000 PSI tensile strength and Rockwell B96 hardness to withstand substantial loads and vibrations
• Optimized thread engagement featuring Class 6g coarse threads for faster installation and reduced cross-threading risks
• Low-profile rounded button head design provides smooth finished appearance while maintaining adequate drive torque capability
• Full threading along 10mm length ensures maximum grip strength and uniform stress distribution across fastened components
• Comprehensive regulatory compliance meeting international standards including ASTM F879M and ISO 7380 for guaranteed quality and performance

Professional Applications & Engineering Value

This M4 metric screw delivers exceptional engineering value through its specialized combination of 18-8 stainless steel material and tamper-resistant Torx drive. The passivated finish creates a protective oxide layer that significantly enhances corrosion resistance, making these rounded head screws ideal for industrial equipment, electronic enclosures, and outdoor applications where environmental exposure is a concern. The fully threaded design with Class 6g coarse threads ensures rapid installation and reliable clamping force in automated assembly processes. For security-conscious applications, the T15 tamper-resistant drive provides vital protection against vandalism and unauthorized disassembly while maintaining the high torque capability needed for critical connections in machinery, transportation, and public infrastructure projects.

Specification Summary & Compliance

This M4 x 0.7mm pitch x 10mm length fastener features precision metric thread manufacturing with Class 6g tolerance for consistent fit and performance. The screw conforms to ASTM F879M and ISO 7380 specifications governing dimensional accuracy and mechanical properties. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, ensuring restricted substance compliance for global markets. The fully threaded coarse spacing design maintains proper thread engagement while the right-hand thread direction follows standard industrial conventions for simplified installation.