S-90273A112 4-40 x 5/8" 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, extending service life in demanding industrial environments
- Exceptional holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable fastening in high-stress applications
- Precise flush mounting thanks to the 82° countersink angle and flat head design that sits perfectly flush with surfaces
- Quick and efficient installation with Phillips No. 1 drive that provides secure tool engagement and reduces slippage
- Wide compatibility with Class 2A UNC coarse threads ensuring easy engagement and reliable performance in various materials
- Full thread coverage along the entire 5/8" length for maximum grip strength and distribution of clamping force
- Regulatory compliance meeting ASME B18.6.3, RoHS 3, and REACH standards for quality assurance and environmental safety
Professional Applications & Engineering Value
These 4-40 UNC flat head Phillips screws deliver exceptional engineering value across industrial applications where flush surface mounting and high tensile strength are critical. The zinc-plated steel construction provides superior corrosion protection for machinery, electrical enclosures, and automotive assemblies exposed to harsh environments. The 82° countersink angle ensures perfect flush installation in precision equipment, while the coarse UNC threads and Class 2A thread fit enable quick assembly with reduced cross-threading risks. The fully threaded design maximizes engagement depth, making these screws ideal for sheet metal, plastic components, and electronic chassis where vibration resistance and reliable fastening are paramount for operational safety and longevity.
Specification Summary & Compliance
These screws maintain Class 2A thread fit tolerance per UNC standards with precise dimensional accuracy. Manufacturing complies with ASME B18.6.3 specifications for flat head screw geometry and performance requirements. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring they meet current environmental safety standards for industrial use.
