S-91870A426 M4 x 30 mm ASTM F879M Tamper-Resistant Torx Stainless Steel Flat Head Screws
Tamper-Resistant Torx Stainless Steel Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Enhanced tamper resistance with T20 Torx drive prevents unauthorized access in security-sensitive installations
- Superior corrosion resistance through 18-8 stainless steel construction and passivated surface treatment
- Reliable fastening performance with 80,000 psi tensile strength and Rockwell B96 hardness for demanding applications
- Precision thread engagement through Class 6g fit and full threading ensures consistent clamping force
- Streamlined installation with standard flat head profile and coarse thread pitch for faster assembly
- Long-term durability in harsh environments thanks to stainless steel's inherent corrosion resistance
- Regulatory compliance meets international standards including ASTM F879M, RoHS 3, and REACH
Professional Applications & Engineering Value
Engineered for security-critical industrial applications, this M4 metric flat head screw addresses the dual challenges of unauthorized tampering and environmental degradation. The tamper-resistant T20 Torx drive provides superior anti-vandalism protection for public infrastructure, electrical enclosures, and machinery access panels. Manufactured from 18-8 stainless steel with a passivated finish, the screw delivers exceptional resistance to corrosion, moisture, and chemical exposure in outdoor or harsh industrial environments. The fully threaded design with Class 6g thread fit ensures maximum thread engagement and reliable fastening integrity across repeated maintenance cycles. These metric screws are particularly valuable in applications requiring both security and corrosion resistance, such as transportation equipment, telecommunications infrastructure, and industrial control systems.
Specification Summary & Compliance
This flat head screw features M4 x 0.7mm coarse metric thread with Class 6g thread fit precision and 30mm length. Manufacturing specifications comply with ASTM F879M standard for socket head cap screws. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring restricted substance compliance for international markets. The 90° countersink angle provides standard flush mounting capability in prepared surfaces.
