S-90388A115 M4 x 8 mm ASME B18.3.4M, ISO 7380 Tamper-Resistant Torx Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with specialized Torx T15 drive that deters unauthorized access in public or high-security installations
• Superior corrosion protection from black-oxide surface treatment, extending service life in demanding industrial environments
• Exceptional mechanical strength with 130,000 psi tensile strength and Rockwell C38 hardness for reliable performance under heavy loads
• Optimized thread engagement through Class 6g thread fit and coarse pitch design, ensuring faster assembly and reduced cross-threading risks
• Streamlined installation profile with low-profile rounded button head that minimizes protrusion while maintaining high clamp force
• Full-threaded design providing consistent holding power across the entire 8mm length for maximum joint integrity
• Global compliance assurance meeting both ASME B18.3.4M and ISO 7380 standards for international project compatibility

Professional Applications & Engineering Value

These M4 metric screws with tamper-resistant Torx drive address critical security and reliability challenges in industrial assembly. The black-oxide alloy steel construction provides essential corrosion resistance for machinery, electrical enclosures, and outdoor equipment where environmental factors degrade ordinary fasteners. The coarse thread pitch (0.7mm) enables quicker installation in production environments while maintaining Class 6g thread fit precision for vibration-resistant connections. The rounded button head profile offers a flush mounting solution for applications where protruding fastener heads pose safety or clearance issues. These screws deliver 130,000 psi tensile strength performance for critical joints in automotive, aerospace, and industrial machinery where failure is not an option.

Specification Summary & Compliance

Manufactured to ASME B18.3.4M and ISO 7380 specifications with Class 6g thread tolerance ensuring dimensional accuracy. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The metric coarse thread (M4 x 0.7mm) provides optimal performance in most materials, while the 8mm length and fully threaded design deliver consistent clamping force. Rockwell C38 hardness maintains thread integrity through repeated installation cycles.