S-90471A445 1/4"-20 x 5/8" 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, extending service life in demanding industrial environments
- High tensile strength of 60,000 psi ensures reliable fastening performance under significant mechanical stress
- Precision Class 2A thread fit provides consistent engagement and reduces cross-threading risks during installation
- 100° countersink angle with standard flat head profile enables flush mounting for clean, professional finishes
- Phillips No. 3 drive design offers efficient torque transfer and reduces driver slippage during assembly
- Full threading along 5/8" length maximizes grip strength and distribution across the entire fastener
- Rockwell B70 hardness rating maintains structural integrity through repeated installation cycles
Professional Applications & Engineering Value
These 1/4-20 UNC flat head screws deliver exceptional engineering value through their zinc-plated steel composition and coarse thread design. The combination provides superior resistance to vibration loosening in machinery, automotive assemblies, and electrical enclosures where right-hand threading facilitates standard installation practices. The 100° countersink angle ensures seamless integration into angled surfaces while maintaining structural integrity. With 60,000 psi tensile strength and Rockwell B70 hardness, these industrial fasteners withstand dynamic loads and repeated stress cycles, making them ideal for production lines, metal fabrication, and equipment maintenance where reliability is paramount.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with UNC coarse threading (1/4"-20) for consistent performance. Fully compliant with ASME B18.6.3 manufacturing specifications, ensuring dimensional accuracy and interchangeability. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming restricted substance-free composition for global industrial applications.
