S-90471A422 1/4"-20 x 1 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 demanding environments
- Exceptional holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable fastening in heavy-duty applications
- Precision thread engagement with Class 2A fit and UNC coarse threads ensuring consistent performance and easy installation
- Optimal flush mounting with standard 100° countersink angle and flat head design for seamless surface integration
- Enhanced drive stability with No. 3 Phillips drive providing secure torque transmission and reduced cam-out risk
- Full-thread coverage along the 1-1/2" length maximizes grip strength and load distribution across connected materials
- 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 deliver critical engineering solutions where surface-flush fastening and corrosion resistance are paramount. The combination of 60,000 psi tensile strength and UNC coarse threads provides exceptional vibration resistance in machinery assembly, automotive components, and structural frameworks. The 100° countersink angle ensures secure seating in tapered holes, preventing protrusion in precision equipment. With full threading along the entire 1-1/2" length, these Phillips drive screws maintain consistent clamping force across joined materials, making them ideal for industrial applications requiring reliable, long-term fastening performance under mechanical stress.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (1/4"-20) and standard flat head profile. Complies with ASME B18.6.3 manufacturing specifications for dimensional accuracy and performance. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, ensuring safe use in regulated industries.
