S-90273A433 5/16"-18 x 7/8" 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 for extended service life in demanding environments
- High tensile strength (60,000 psi) ensures reliable performance under heavy loads and vibration
- Class 2A thread fit provides consistent, reliable engagement while maintaining easy assembly
- Standard 82° countersink angle allows for flush mounting and clean aesthetic finish
- Fully threaded design maximizes grip length and load distribution across the entire fastener
- Rockwell B70 hardness maintains thread integrity and prevents stripping during installation
- Coarse UNC threading enables quick assembly and reduced cross-threading risks
Professional Applications & Engineering Value
These 5/16"-18 UNC flat head screws deliver exceptional engineering value in industrial applications where flush mounting and high strength are critical. The zinc-plated steel construction provides essential corrosion protection for machinery, equipment frames, and structural assemblies exposed to environmental elements. The fully threaded coarse UNC design ensures rapid installation in wood, metal, and composite materials while maintaining superior pull-out resistance. The standard 82° countersink angle creates seamless surface transitions in countersunk holes, eliminating protrusions that could interfere with moving parts or create safety hazards. These flat head Phillips screws are engineered to withstand vibration and dynamic loads in construction, manufacturing, and heavy equipment applications where fastener failure is not an option.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent performance. Complies with ASME B18.6.3 specifications for mechanical fasteners, ensuring dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards for restricted substances. Features UNC coarse threads with right-hand threading direction and standard flat head profile for universal compatibility across industrial applications.
