S-90275A575 1/4"-20 x 4 1/2" ASME B18.6.3 Steel Slotted Flat Head Screws
Steel Slotted 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
- Exceptional holding power with 60,000 PSI tensile strength to withstand heavy loads and vibration
- Optimized flush installation with standard 82° countersink angle for smooth, professional surface finishes
- Reliable thread engagement with Class 2A UNC coarse threads ensuring consistent fastening performance
- Full-length threading provides maximum grip along the entire 4-1/2" length for superior load distribution
- Enhanced durability with Rockwell B70 hardness maintaining structural integrity under repeated stress
- Industry-standard compliance meeting ASME B18.6.3 specifications for guaranteed dimensional accuracy
Professional Applications & Engineering Value
This zinc-plated steel flat head screw delivers critical engineering solutions where surface flushness and high tensile strength are paramount. The 1/4"-20 UNC coarse thread configuration ensures rapid installation and superior resistance to vibration loosening in heavy machinery, structural frameworks, and industrial equipment. The 82° countersink angle provides seamless surface integration while the full threading maximizes load-bearing capacity across the entire fastener length. Engineered for demanding applications in manufacturing, construction, and automotive sectors, this screw's 60,000 PSI tensile strength and corrosion-resistant plating address common failure points in high-stress environments, ensuring long-term reliability and reduced maintenance cycles.
Specification Summary & Compliance
Manufactured to exact ASME B18.6.3 standards with Class 2A thread fit tolerances for precision mating with corresponding nuts and threaded components. The UNC coarse thread profile (1/4"-20) ensures reliable performance in industrial applications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe usage across global markets. Dimensional specifications include 4-1/2" length, 0.477" head diameter, and standard flat head profile for consistent installation performance.
