S-90471A405 1/4"-20 x 3/8" 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
- Exceptional holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable fastening performance
- Optimized flush mounting with standard flat head profile and 100° countersink angle for seamless surface integration
- Enhanced drive engagement through Phillips No. 3 drive design reducing cam-out during installation
- Quick assembly efficiency with UNC coarse threading and Class 2A thread fit for rapid installation in various materials
- Maximum thread engagement through fully threaded design ensuring consistent clamping force along entire length
- Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for quality and environmental safety
Professional Applications & Engineering Value
These zinc-plated steel flat head screws provide critical solutions for industrial applications requiring flush surface mounting and reliable fastening integrity. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures exceptional resistance to vibration loosening and mechanical stress in assembly operations. The UNC coarse threading with Class 2A fit enables rapid installation in metal, wood, and composite materials while maintaining precise alignment. The 100° countersink angle and standard flat head profile create seamless transitions in precision machinery, electrical enclosures, and structural components where protrusion-free surfaces are mandatory. The Phillips drive system with No. 3 size offers balanced torque transmission for consistent seating without damaging the drive recess.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit ensuring dimensional accuracy and interchangeability. Features 1/4"-20 UNC coarse threads with right-hand orientation and 3/8" length for standardized applications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming adherence to international safety and substance restriction standards for industrial components.
