S-95635A262 4-40 x 3/8" ASME B18.3 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
- Superior tamper resistance with specialized hex drive that deters unauthorized access in high-security environments
- Exceptional corrosion resistance through 18-8 stainless steel construction and passivated surface treatment
- High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
- Precise thread engagement with Class 3A thread fit ensuring reliable fastening in coarse UNC threading
- Enhanced durability through fully threaded design and rounded button head profile that resists stripping
- Regulatory compliance meeting both industry standards and environmental regulations for global deployment
- Optimized drive performance with 3/32" tamper-resistant hex drive providing secure installation while preventing vandalism
Professional Applications & Engineering Value
These 4-40 UNC thread security screws deliver critical protection for industrial equipment, public infrastructure, and electronic enclosures where tampering poses significant risks. The 18-8 stainless steel core provides inherent corrosion resistance, while the passivated finish enhances surface durability against chemicals and environmental exposure. The tamper-resistant hex drive design prevents standard tools from engaging, making these rounded head screws ideal for securing access panels, control systems, and machinery in unsupervised locations. With coarse thread spacing and Class 3A thread fit, installation remains efficient while maintaining vibration resistance in high-stress applications where reliability is paramount.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 specifications with Class 3A thread fit precision for superior engagement. The 4-40 UNC coarse thread configuration ensures reliable performance in various materials. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming these security screws meet international standards for restricted substances. The combination of 70,000 psi tensile strength and Rockwell B70 hardness validates mechanical performance for critical fastening applications requiring both security and durability.
