S-90272A109 4-40 x 7/16" ASME B18.6.3 Steel Pan Head Phillips Screws
Steel Pan Head Phillips 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 corrosion resistance through zinc plating, extending service life in demanding industrial environments
- Superior driving efficiency with Phillips No. 1 drive design, reducing installation time and tool slippage
- Optimized load distribution from the rounded pan head profile, minimizing surface damage during tightening
- Maximum thread engagement with fully threaded construction, ensuring consistent clamping force across applications
- Reliable mechanical performance backed by Rockwell B70 hardness, providing excellent resistance to deformation
- Broad compatibility with 4-40 UNC coarse threads and Class 2A fit, facilitating easy assembly with standard components
- Regulatory confidence through compliance with ASME B18.6.3, RoHS 3, and REACH standards
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel screws deliver critical advantages in precision assembly applications where corrosion resistance and consistent performance are paramount. The coarse thread design enables rapid installation in machinery, electronic enclosures, and automotive components while resisting vibration-induced loosening. With fully threaded construction and Class 2A thread fit, these rounded head Phillips screws maintain uniform pressure distribution across joined materials, preventing stress concentration points. The zinc-plated steel composition provides essential protection against environmental degradation in industrial settings, while the Rockwell B70 hardness ensures the pan head profile maintains integrity under repeated torque applications. This combination addresses common fastener failure modes including corrosion, stripping, and fatigue.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance for consistent mating with standard components. The 4-40 UNC coarse thread configuration ensures reliable engagement while the 7/16" length provides versatile fastening capabilities. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe usage across regulated industries.
