S-90273A418 5-40 x 3/8" ASME B18.6.3 Steel Phillips Flat Head Screws
Steel 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 corrosion resistance with zinc-plated steel construction, ensuring long-term reliability in demanding industrial environments
- Exceptional tensile strength rated at 60,000 psi for secure fastening in high-stress applications
- Precision Class 2A thread fit provides consistent engagement and reduces cross-threading risks during installation
- Optimized Phillips No. 2 drive delivers efficient torque transfer while minimizing cam-out incidents
- Standard 82° countersink angle enables flush mounting for clean, professional finishes
- Full threading along 3/8" length ensures maximum grip strength across the entire fastener engagement
- Rockwell B70 hardness maintains structural integrity under repeated assembly and disassembly cycles
Professional Applications & Engineering Value
These 5-40 UNC flat head Phillips screws deliver critical performance advantages for industrial assembly applications where flush mounting and high-strength fastening are paramount. The zinc-plated steel construction provides essential corrosion protection for equipment exposed to moderate environmental conditions, while the coarse UNC threading ensures rapid installation and superior resistance to vibration loosening. The combination of 60,000 psi tensile strength and Rockwell B70 hardness makes these fasteners ideal for machinery, electronic enclosures, and automotive components where dimensional stability under load is critical. The fully threaded design maximizes surface contact area, distributing stress evenly across the entire engagement length for enhanced joint integrity.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerances ensuring consistent performance. These 3/8" flat head screws feature standard 82° countersink angles and right-hand UNC coarse threads for universal compatibility. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe use across global industrial markets.
