S-95635A811 M4 x 20 mm ASTM F879M Tamper-Resistant Hex-Drive Stainless Steel Button Head Screws
Tamper-Resistant Hex-Drive Stainless Steel Button 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
- Tamper-resistant hex drive prevents unauthorized removal, enhancing security in public or controlled-access environments.
- 18-8 stainless steel construction offers excellent corrosion resistance and durability for long service life in demanding conditions.
- Passivated finish further improves corrosion protection, ensuring reliability in humid or chemically aggressive settings.
- High tensile strength of 80,000 psi provides reliable clamping force and resistance to mechanical stress in industrial assemblies.
- Rockwell B96 hardness ensures the screw maintains its form and thread integrity under load, reducing wear and failure risk.
- Class 6g thread fit with coarse pitch allows for quick, secure installation and robust engagement in various materials.
- Fully threaded design maximizes grip and load distribution along the entire length for consistent fastening performance.
Professional Applications & Engineering Value
This M4 metric screw with a 0.7mm coarse thread pitch and 20mm length is engineered to address critical fastening challenges in security-conscious and high-stress applications. The rounded button head and tamper-resistant hex drive make it ideal for public infrastructure, electronic enclosures, and machinery where vandalism or tampering is a concern. Manufactured from 18-8 stainless steel with a passivated finish, it resists rust and chemical exposure, ensuring longevity in outdoor or industrial environments. The combination of high tensile strength and Rockwell B96 hardness provides reliable performance in assemblies subject to vibration and dynamic loads, reducing maintenance needs and downtime.
Specification Summary & Compliance
This screw adheres to precise dimensional standards with a Class 6g thread fit and metric coarse threading for consistent compatibility. It meets ASTM F879M specifications for quality and performance, and is REACH compliant (EC 1907/2006), ensuring it is free from hazardous substances as of the latest update. The product is fully threaded and designed for reliable use in industrial fastening applications.
