S-90272A108 4-40 x 3/8" 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 with zinc-plated steel construction for longer service life in demanding environments
- Superior mechanical strength from Rockwell B70 hardness, ensuring reliable performance under load
- Efficient installation with Phillips No. 1 drive and rounded pan head design for secure tool engagement
- Wide compatibility through 4-40 UNC coarse threading and Class 2A fit for versatile industrial applications
- Full-thread engagement providing maximum holding power across the entire 3/8" length
- Regulatory compliance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
- Optimized head profile with standard rounded pan design for reduced surface protrusion and improved aesthetics
Professional Applications & Engineering Value
These zinc-plated steel rounded pan head screws deliver exceptional engineering value across multiple industrial sectors. The combination of 4-40 UNC coarse threading and Class 2A thread fit ensures rapid installation with minimal cross-threading risk in assembly line operations. The Rockwell B70 hardness provides necessary tensile strength for vibration-resistant fastening in machinery, electronics enclosures, and automotive components. The zinc plating offers critical corrosion protection for applications exposed to moisture or harsh operating conditions. The fully threaded design maximizes grip length in thin materials while the Phillips No. 1 drive enables efficient torque transfer without cam-out issues. These industrial screws solve common fastening challenges by balancing installation speed, mechanical reliability, and environmental durability.
Specification Summary & Compliance
This fastener maintains Class 2A thread fit tolerance per UNC standards with precise 4-40 thread size and coarse thread spacing. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring restricted substance adherence. The right-hand thread direction and fully threaded 3/8" length provide consistent engagement characteristics across production applications.
