S-90517A516 1/4"-20 x 1 1/2" ASME B18.3 Tamper-Resistant Hex Drive Flat Head Screws
Tamper-Resistant Hex Drive Flat 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
- Enhanced tamper resistance with specialized hex drive design to prevent unauthorized access in high-security applications.
- Superior corrosion resistance from 18-8 Stainless Steel construction and passivated finish, ensuring longevity in harsh environments.
- Reliable high-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding industrial loads.
- Precise thread engagement with Class 3A fit and UNC coarse threads for secure, vibration-resistant fastening.
- Flush mounting capability thanks to standard flat head profile and 82° countersink angle for smooth surface finishes.
- Broad compliance assurance meeting ASME B18.3 specifications and environmental standards like RoHS 3 and REACH.
- Optimized for inch-system applications with 1/4"-20 thread size and 1½" length for versatile industrial use.
Professional Applications & Engineering Value
These 1/4"-20 flat head screws deliver critical security and durability in demanding environments. The 18-8 Stainless Steel material combined with a passivated finish provides exceptional resistance to corrosion, making them ideal for outdoor equipment, marine hardware, and chemical processing facilities. The tamper-resistant hex drive prevents vandalism in public infrastructure, while the Class 3A thread fit ensures tight tolerances for vibration-prone machinery. With UNC coarse threads and partial threading, they offer quick assembly and reduced risk of cross-threading in production lines. These ASME B18.3 compliant fasteners solve installation efficiency and long-term reliability challenges across security systems, industrial enclosures, and transportation equipment.
Specification Summary & Compliance
This product features precision Class 3A thread fit with UNC coarse threading (1/4"-20 size) and inch-system dimensions. Manufacturing adheres to ASME B18.3 standards for consistent quality. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe use in regulated industries.
