S-90273A544 1/4"-20 x 1 1/4" 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 demanding environments
- Exceptional 60,000 psi tensile strength ensures reliable fastening under high-stress industrial applications
- Precision Class 2A thread fit provides smooth installation and consistent engagement with mating components
- 82° countersink angle design enables flush mounting for clean, professional finishes
- Full threading along 1-1/4" length maximizes grip strength and load distribution across the entire fastener
- Phillips No. 3 drive compatibility offers widespread tool accessibility and efficient installation
- Comprehensive regulatory compliance meets ASME B18.6.3, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
These 1/4-20 UNC flat head screws deliver critical engineering solutions where flush surface mounting and high tensile strength are paramount. The zinc-plated steel construction provides essential corrosion protection for machinery, electrical enclosures, and structural assemblies exposed to industrial atmospheres. The coarse UNC thread profile ensures rapid installation and superior resistance to vibration loosening in equipment manufacturing and maintenance applications. With Rockwell B70 hardness and fully threaded design, these Phillips drive screws maintain structural integrity while the 82° countersink creates seamless transitions in metal fabrication, automotive, and construction projects where surface aesthetics matter.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance for consistent performance. The 1/4"-20 UNC coarse thread configuration ensures reliable engagement while the 1-1/4" length provides optimal fastening depth. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety and unrestricted use in international markets.
