S-97124A125 4-40 x 3/16" ASME B18.6.3 Aluminum Phillips Flat Head Screws
Aluminum Phillips 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
- Superior strength-to-weight ratio with 2024 aluminum construction and 50,000 psi tensile strength for reliable performance in demanding applications
- Precise flush installation enabled by the 82° countersink angle and undercut flat head profile for clean, professional finishes
- Excellent thread engagement with Class 2A thread fit and UNC coarse threading ensuring secure fastening and vibration resistance
- Enhanced durability with Rockwell B55 hardness providing superior wear resistance and long service life
- Comprehensive compliance with ASME B18.6.3 manufacturing standards and environmental regulations including RoHS 3 and REACH
- Optimized drive performance through Phillips No. 1 drive design for efficient installation and reduced cam-out risk
- Full-thread coverage along the 3/16" length maximizes grip strength and distributes load evenly
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver exceptional engineering value for precision applications where weight reduction, corrosion resistance, and reliable fastening are critical. The 2024 aluminum construction provides an optimal balance of strength and lightweight properties, making them ideal for aerospace components, electronic enclosures, and precision instrumentation. The undercut flat head profile with 82° countersink angle ensures flush mounting in thin materials while preventing surface protrusion. With Class 2A thread fit and coarse UNC threading, these screws offer superior resistance to vibration loosening and ensure consistent performance in high-stress industrial environments. The fully threaded design maximizes contact surface area, distributing mechanical loads evenly across the fastener for enhanced joint integrity.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerance for precision assembly. Features UNC coarse threading (4-40) with right-hand direction and complete compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The screws maintain dimensional accuracy with 0.215" head diameter, 0.067" head height, and 3/16" length, ensuring consistent performance across industrial applications.
