S-90517A111 6-32 x 3/8" ASME B18.3 Tamper-Resistant Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with specialized hex drive design to prevent unauthorized access in sensitive equipment and public installations
• Superior corrosion resistance through 18-8 stainless steel construction and passivated surface treatment for extended service life in harsh environments
• High-load bearing capability with 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under mechanical stress
• Precision thread engagement with Class 3A fit and UNC coarse threading ensuring secure fastening and vibration resistance
• Optimal flush mounting featuring standard 82° countersink angle and flat head design for smooth surface finishes
• Full-thread coverage along the 3/8" length providing maximum grip strength and load distribution
• Regulatory compliance meeting ASME B18.3 specifications and international environmental standards for global project acceptance

Professional Applications & Engineering Value

These 6-32 UNC flat head tamper-resistant hex screws address critical security and durability challenges in industrial settings. The 18-8 stainless steel material combined with passivated finish creates a robust barrier against corrosion, making them ideal for outdoor equipment, marine components, and chemical processing facilities where environmental resistance is paramount. The tamper-resistant hex drive design provides essential security for public infrastructure, electrical enclosures, and access panels while maintaining the installation efficiency of standard hex drives. With Class 3A thread fit and coarse thread spacing, these screws deliver reliable performance in vibration-prone applications, preventing loosening in machinery, transportation equipment, and assembly line systems. The 82° countersink angle ensures flush mounting for safety-critical applications where protruding fasteners could cause injury or interference.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit and UNC thread form ensuring interchangeability and reliable performance. These flat head screws comply with ASME B18.3 specifications for dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming they contain no restricted substances. The combination of 70,000 psi tensile strength and Rockwell B55 hardness provides verified mechanical performance for demanding industrial applications.