S-91900A304 M4 x 30 mm ASTM F879M, ISO 7380 Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with T15 Torx drive design, preventing unauthorized access in sensitive equipment installations
• Superior corrosion protection through 18-8 stainless steel construction and passivated surface treatment for extended service life
• High mechanical reliability with 80,000 psi tensile strength and Rockwell B96 hardness for demanding industrial applications
• Precision thread engagement with Class 6g coarse threads ensuring secure fastening and vibration resistance
• Streamlined installation through fully threaded design and rounded button head profile for flush mounting
• Regulatory compliance assurance meeting ASTM F879M, ISO 7380, RoHS 3, and REACH standards for global market acceptance
• Optimized security performance combining tamper-resistant drive with metric M4 x 0.7mm coarse threading for critical fastening applications

Professional Applications & Engineering Value

These M4 metric screws with tamper-resistant Torx drive address critical security and durability challenges in industrial environments. The 18-8 stainless steel composition, enhanced by passivated finish, provides exceptional resistance to corrosion and chemical exposure, making them ideal for electronics enclosures, machinery guards, and outdoor equipment where environmental factors compromise fastener integrity. The rounded button head design offers a low-profile installation while the T15 drive system prevents unauthorized tampering in public access equipment, security panels, and regulated industrial machinery. With fully threaded construction and Class 6g thread fit, these screws maintain consistent clamping force in vibration-prone applications, ensuring long-term fastening reliability without loosening or failure.

Specification Summary & Compliance

These rounded head screws feature precise M4 x 0.7mm coarse thread with Class 6g tolerance according to metric standards. Manufacturing specifications comply with ASTM F879M and ISO 7380 standards, ensuring dimensional accuracy and performance consistency. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming they are free from restricted substances for global industrial use. The 30mm length and right-hand thread direction provide standardized installation compatibility across metric fastening systems.