S-90273A426 1/4"-20 x 1 1/8" 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 heavy-duty applications
- Optimized installation efficiency with standard 82° countersink angle providing flush mounting and No. 3 Phillips drive for secure tool engagement
- Enhanced thread engagement through full threading and Class 2A coarse UNC threads ensuring consistent fastening performance
- Broad compatibility with standard 1/4"-20 UNC threading for seamless integration into existing industrial assemblies
- Regulatory confidence with full compliance to ASME B18.6.3 mechanical standards and environmental regulations including RoHS 3 and REACH
Professional Applications & Engineering Value
These zinc-plated steel flat head screws deliver critical engineering solutions where surface flushness and corrosion resistance are paramount. The 1/4"-20 UNC coarse threading combined with full threading provides maximum thread contact in softer materials and faster installation in production environments. The standard 82° countersink angle ensures proper seating in chamfered holes, preventing protrusion in machinery, automotive, and electrical enclosure applications. With 60,000 psi tensile strength and Rockwell B70 hardness, these Phillips drive screws maintain structural integrity under vibration and load stresses, making them ideal for assembly lines requiring both speed and reliability in industrial fastening operations.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 1/4"-20 UNC coarse threads and right-hand threading orientation. These flat head screws conform to ASME B18.6.3 mechanical specifications for dimensional accuracy and performance. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring restricted substance-free components for global industrial supply chains.
