S-90517A514 1/4"-20 x 1" ASME B18.3 Tamper-Resistant Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with specialized hex drive design prevents unauthorized removal in high-security environments
• Superior corrosion protection through 18-8 stainless steel construction and passivated finish for extended service life
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Precision thread engagement with Class 3A fit ensures reliable fastening performance and vibration resistance
• Optimized flush mounting with standard 82° countersink angle for seamless surface integration
• Industry-standard compliance meeting ASME B18.3 specifications for consistent quality and interchangeability
• Environmental regulation adherence with RoHS 3 and REACH compliance for global market acceptance

Professional Applications & Engineering Value

These 1/4-20 UNC flat head tamper-resistant hex screws provide critical security solutions for industrial equipment, public infrastructure, and access control systems where unauthorized tampering poses significant risks. The 18-8 stainless steel material combined with passivated finish delivers exceptional resistance to corrosion and chemical exposure, while the tamper-resistant hex drive design ensures only authorized personnel can perform maintenance or adjustments. The coarse thread spacing and Class 3A thread fit enable rapid installation with minimal cross-threading risk, making them ideal for production environments requiring both security and efficiency. These fully threaded screws maintain consistent engagement throughout the fastened materials, distributing load evenly across the entire length for enhanced structural integrity in vibration-prone applications.

Specification Summary & Compliance

This 1/4-20 UNC flat head screw features precision Class 3A thread fit with coarse thread spacing and right-hand threading, manufactured to exact ASME B18.3 dimensional standards. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial markets. Critical dimensions include 1" length, 0.531" head diameter, and 82° countersink angle for standardized installation across compatible applications.