S-91900A303 M4 x 25 mm ASTM F879M, ISO 7380 Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with specialized Torx T15 drive prevents unauthorized access in high-security environments
• Superior corrosion protection through 18-8 stainless steel construction and passivated surface treatment
• Reliable mechanical performance with 80,000 psi tensile strength and Rockwell B96 hardness for demanding applications
• Optimized thread engagement through Class 6g thread fit and full threading ensures consistent clamping force
• Streamlined installation with rounded button head design reduces snagging and provides clean aesthetic finish
• Broad regulatory compliance meeting ASTM F879M, RoHS 3, and REACH standards for global industrial use
• Precision metric sizing with M4×0.7mm×25mm dimensions ensures compatibility with standard metric equipment

Professional Applications & Engineering Value

These 18-8 stainless steel tamper-resistant Torx screws address critical challenges in industrial security and environmental durability. The passivated finish significantly enhances corrosion resistance in harsh operating conditions, while the T15 tamper-resistant drive prevents unauthorized tampering in public infrastructure, electrical enclosures, and machinery access panels. The fully threaded M4 metric design with Class 6g thread fit ensures maximum thread engagement and vibration resistance, maintaining secure fastening in dynamic environments. The rounded button head profile combines aesthetic appeal with functional benefits, eliminating sharp edges that could damage equipment or wiring. Engineered to meet rigorous ASTM F879M specifications, these security screws deliver reliable performance in manufacturing, telecommunications, transportation, and public facility applications where both security and corrosion resistance are paramount.

Specification Summary & Compliance

This metric screw features precise M4×0.7mm coarse threading with Class 6g thread fit tolerance according to ISO standards. Manufacturing complies with ASTM F879M specifications for dimensional accuracy and mechanical properties. The product is fully RoHS 3 (2015/863/EU) compliant and meets REACH (EC 1907/2006) requirements regarding substance restrictions, ensuring environmental regulatory compliance for international industrial markets.