S-90388A512 M4 x 20 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 for secure installations in high-security environments
• Superior corrosion protection from black-oxide coating on alloy steel, extending service life in demanding conditions
• High mechanical strength with 130,000 psi tensile strength and Rockwell C38 hardness for reliable load-bearing performance
• Optimized thread engagement through Class 6g metric coarse threading ensuring vibration-resistant fastening
• Streamlined installation with fully threaded design and rounded button head for flush mounting and reduced snagging
• Regulatory compliance assurance meeting international standards including ASME B18.3.4M and ISO 7380
• Environmental responsibility through RoHS 3 and REACH compliance for sustainable manufacturing practices

Professional Applications & Engineering Value

Engineered for critical industrial applications where security and durability are paramount, these M4 metric screws solve common fastening challenges in electronics enclosures, machinery guards, and public infrastructure. The black-oxide alloy steel construction provides essential corrosion resistance while maintaining high tensile strength under dynamic loads. The tamper-resistant Torx T15 drive prevents unauthorized access without compromising installation efficiency, making these rounded head screws ideal for maintenance-free assemblies. The metric coarse thread with Class 6g tolerance ensures rapid installation and reliable thread engagement in both metallic and composite materials, reducing assembly time while providing long-term vibration resistance in demanding environments.

Specification Summary & Compliance

Manufactured to precise metric dimensions (M4 x 0.7mm pitch x 20mm length) with Class 6g thread fit tolerance per ISO standards. Complies with ASME B18.3.4M and ISO 7380 mechanical specifications for dimensional accuracy and performance. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements, ensuring safe use in regulated industries. The fully threaded design with standard rounded head profile provides consistent fastening performance across applications.