S-90273A105 4-40 x 3/16" 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
- Optimized flush mounting with 82° countersink angle and undercut flat head design for seamless surface integration
- High-strength performance with 60,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing applications
- Precision thread engagement through Class 2A UNC coarse threads ensuring consistent fastening and vibration resistance
- Enhanced installation efficiency with Phillips No. 1 drive design providing secure tool engagement and reduced cam-out
- Full-thread coverage along the 3/16" length maximizes grip strength and distribution of clamping force
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver exceptional engineering value through their zinc-plated steel composition and precision coarse thread design. The combination of 60,000 psi tensile strength and Rockwell B70 hardness addresses critical industrial challenges where fastener failure is not an option. The fully threaded configuration ensures maximum thread engagement in thin materials and tight spaces, while the 82° countersink angle with undercut profile prevents surface protrusion in precision assemblies. Particularly valuable in electronics, machinery, and automotive applications, these Phillips drive screws provide reliable fastening solutions that withstand vibration, corrosion, and mechanical stress while maintaining consistent performance across production cycles.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 standards with Class 2A thread fit tolerance for precision assembly. The inch-system specifications include 4-40 UNC coarse threads, 3/16" length, and 0.212" head diameter. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures safe usage across global markets. Thread direction is right-hand with fully threaded design for maximum fastening efficiency.
