S-90471A448 5/16"-18 x 3/4" 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 harsh industrial environments
- Exceptional mechanical strength with 60,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
- Reliable thread engagement through Class 2A thread fit and UNC coarse threading for secure fastening
- Efficient installation with Phillips No. 4 drive and standard 100° countersink angle for flush mounting
- Full-thread design provides maximum grip length and load distribution across the entire fastener
- Industry-standard compliance ensures consistent quality and interchangeability in professional applications
- Environmental responsibility with RoHS 3 and REACH compliance for sustainable manufacturing practices
Professional Applications & Engineering Value
These 5/16"-18 UNC flat head screws deliver critical performance advantages for industrial assembly applications where flush mounting and high-strength fastening are essential. The zinc-plated steel construction provides superior corrosion protection, extending service life in demanding environments while maintaining 60,000 psi tensile strength for structural integrity. The UNC coarse threading with Class 2A fit ensures reliable engagement in various materials, reducing installation time and preventing cross-threading issues. The standard 100° countersink angle and Phillips No. 4 drive facilitate quick, secure installation in metal fabrication, machinery assembly, and construction applications where vibration resistance and long-term reliability are paramount.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerance for precision engagement. Features UNC coarse threading (5/16"-18) with right-hand direction and fully threaded design. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in industrial applications worldwide. The flat head profile maintains standard dimensions for consistent performance across compatible applications.
