S-90273A541 1/4"-20 x 7/8" 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 installation efficiency through UNC coarse threading and No. 3 Phillips drive for faster assembly
- Flush surface finishing with standard 82° countersink angle for seamless integration into materials
- Precision thread engagement with Class 2A thread fit ensuring consistent, reliable connections
- Full regulatory compliance meeting ASME B18.6.3 standards and environmental regulations for global applications
- Complete thread coverage along the 7/8" length for maximum grip and load distribution
Professional Applications & Engineering Value
These zinc-plated steel flat head Phillips screws deliver critical performance advantages for industrial assembly applications where corrosion resistance and structural integrity are paramount. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures reliable performance under vibration and load stress, while the UNC coarse threading provides superior pull-out resistance in various materials. The 82° countersink angle allows for flush mounting in machinery, electrical enclosures, and structural components, eliminating protrusions that could interfere with operation. The zinc plating offers essential protection against environmental factors, making these fully threaded screws ideal for outdoor equipment, manufacturing fixtures, and automotive applications where durability and regulatory compliance are essential.
Specification Summary & Compliance
This 1/4"-20 x 7/8" flat head Phillips screw features precision Class 2A thread fit with UNC coarse threading and right-hand thread direction. Manufactured to ASME B18.6.3 specifications with complete compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The product maintains dimensional accuracy with standard 82° countersink angle and No. 3 Phillips drive size for consistent performance across industrial applications.
