S-91099A479 1/4"-20 x 1 1/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless 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 passivated 18-8 stainless steel construction, ideal for harsh industrial environments and outdoor applications.
- Exceptional tensile strength rated at 80,000 psi ensures reliable, long-lasting fastening under high-stress conditions.
- Optimized flush mounting through the undercut flat head design prevents protrusion and provides a clean, secure finish.
- Enhanced driving efficiency with Phillips No. 3 drive, reducing cam-out and allowing for quick, stable installation.
- Precision thread engagement with Class 2A UNC coarse threads ensures consistent, vibration-resistant connections.
- Full threading along the 1-1/4" length offers maximum grip and adjustability in various material thicknesses.
- Comprehensive compliance with ASME B18.6.3, RoHS 3, and REACH standards guarantees safety and environmental responsibility.
Professional Applications & Engineering Value
These 1/4"-20 UNC flat head screws are engineered to address common industrial challenges such as material fatigue and corrosion-induced failure. The passivated 18-8 stainless steel provides excellent resistance to rust and chemicals, making them suitable for demanding sectors like marine equipment, food processing machinery, and structural assemblies. The undercut head profile ensures a flush fit, minimizing snagging and improving aerodynamic or aesthetic surfaces. Combined with the coarse UNC thread and Phillips drive, these screws deliver quick, secure fastening in wood, metal, and composite materials, reducing installation time and maintenance costs in industrial fastening applications.
Specification Summary & Compliance
This product adheres to precise dimensional standards, including Class 2A thread fit for consistent engagement and 82° countersink angle for proper seating. It meets ASME B18.6.3 specifications for mechanical and dimensional integrity. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), these screws are free from hazardous substances, ensuring safety and environmental responsibility in global supply chains.
