S-90484A162 4-40 x 3/8" ASME B18.3, ASTM F835 Tamper-Resistant Hex-Drive Steel Button Head Screws
Tamper-Resistant Hex-Drive 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 security with specialized hex drive design prevents unauthorized access in sensitive installations
- Exceptional 130,000 psi tensile strength ensures reliable performance under high-stress industrial conditions
- Black-oxide alloy steel construction provides superior corrosion resistance and durability
- Precision Class 3A thread fit delivers secure fastening with minimal vibration loosening
- Rockwell C39 hardness rating maintains structural integrity through repeated installation cycles
- Coarse UNC threading enables quick assembly and reduced cross-threading risks
- Rounded button head profile offers smooth surface finish while maintaining driving torque capability
Professional Applications & Engineering Value
Engineered for critical security applications where tamper-resistance and reliability are paramount, these 4-40 UNC thread screws solve common industrial challenges. The black-oxide alloy steel construction combined with 130,000 psi tensile strength ensures long-term performance in demanding environments including electronic enclosures, machinery guards, and public access equipment. The tamper-resistant hex drive system provides an essential security layer while maintaining the installation efficiency of standard hex drives. With coarse thread spacing and Class 3A fit, these screws deliver vibration-resistant fastening in thin materials and sheet metal assemblies where precise thread engagement is critical for structural integrity.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 and ASTM F835 specifications, these screws feature precision Class 3A thread fit with 4-40 UNC coarse threading and right-hand thread direction. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures safe use across global markets. The 3/8" length and 3/32" tamper-resistant hex drive provide standardized dimensions for consistent performance in industrial fastening systems.
