S-90275A579 1/4"-20 x 5 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 demanding environments
- Exceptional holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable heavy-duty applications
- Optimized flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
- Quick installation and removal through slotted drive compatibility with standard tools
- Reliable thread engagement with UNC coarse threading and Class 2A fit ensuring consistent performance
- Full-length fastening capability with completely threaded shank for maximum grip along the entire length
- Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for quality and safety
Professional Applications & Engineering Value
This zinc-plated steel flat head screw delivers critical engineering solutions for industrial assembly challenges. The combination of 60,000 psi tensile strength and Rockwell B70 hardness provides exceptional load-bearing capacity in structural applications, while the zinc plating offers essential corrosion protection for machinery, outdoor equipment, and manufacturing environments. The UNC coarse thread design ensures rapid installation and superior resistance to vibration loosening, making it ideal for automotive, construction, and heavy equipment applications. The 82° countersink angle and flat head profile create flush surface finishes critical for safety and aesthetics in consumer products and industrial machinery.
Specification Summary & Compliance
This 1/4"-20 UNC flat head screw features precise Class 2A thread fit tolerances and fully threaded design with 5 1/2" length for consistent performance. Manufactured in compliance with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.
