S-90471A410 1/4"-20 x 1/2" 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 environments
- High-load bearing capability with 60,000 psi tensile strength for demanding structural applications
- Optimized drive engagement through Phillips No. 3 drive design preventing cam-out during installation
- Precise flush mounting with standard 100° countersink angle for seamless surface integration
- Reliable thread engagement through Class 2A fit UNC coarse threads ensuring vibration resistance
- Full-length fastening coverage with completely threaded 1/2" length for maximum holding power
- Consistent performance assurance meeting ASME B18.6.3 manufacturing standards
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these zinc-plated steel flat head screws provide exceptional value in construction, machinery assembly, and equipment manufacturing. The UNC coarse thread configuration ensures rapid installation and superior resistance to vibration loosening, while the fully threaded design maximizes load distribution across the entire fastener length. The 100° countersink angle creates a flush surface finish critical for applications requiring aerodynamic profiles or smooth operational surfaces. With Rockwell B70 hardness, these Phillips drive screws maintain structural integrity under repeated stress cycles, making them ideal for assembly lines where consistent performance and corrosion protection are paramount.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance for precise engagement. Features 1/4"-20 UNC coarse threads with standard flat head profile and Phillips No. 3 drive. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. The zinc-plated steel construction meets 60,000 psi tensile strength requirements for reliable performance in structural applications.
