S-90273A551 1/4"-20 x 2 1/4" 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 mechanical strength with Rockwell B70 hardness rating to withstand high-torque applications without stripping
- Optimal flush mounting with standard 82° countersink angle that seats perfectly in tapered holes for smooth surface finishes
- Reliable thread engagement through fully threaded design ensuring maximum holding power across the entire fastener length
- Precise Class 2A thread fit providing consistent assembly performance and interchangeability in UNC coarse thread applications
- Enhanced drive stability with Phillips No. 3 drive that reduces cam-out during installation
- Regulatory compliance assurance meeting both RoHS 3 and REACH environmental standards for global industrial use
Professional Applications & Engineering Value
This 1/4-20 UNC flat head screw delivers critical engineering solutions where surface flushness and structural integrity are paramount. The zinc-plated steel construction provides essential corrosion protection for machinery, electrical enclosures, and outdoor equipment. The coarse thread design ensures rapid installation in soft materials and prevents cross-threading in high-volume assembly operations. With its fully threaded configuration and Class 2A thread fit, this fastener maintains consistent clamping force across wood, metal, and composite applications. The 82° countersink angle creates seamless transitions in tapered holes, eliminating protrusions that could interfere with moving components or create safety hazards in industrial settings.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance for reliable performance in inch-system applications. The UNC coarse thread pattern (1/4"-20) ensures compatibility with standard components. This flat head Phillips screw features complete regulatory compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, making it suitable for global industrial distribution and use in regulated industries.
