S-90273A117 4-40 x 1 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, extending service life in demanding industrial environments
- Exceptional holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable, vibration-resistant fastening
- Optimized installation efficiency through fully threaded design and standard 82° countersink angle for flush mounting
- Precise thread engagement with Class 2A thread fit ensuring consistent performance and reduced cross-threading risks
- Broad compatibility with UNC coarse threading and No. 1 Phillips drive for versatile application across industrial equipment
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards (RoHS 3, REACH)
- Enhanced driving torque transmission through flat head design and Phillips drive, minimizing cam-out during installation
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical engineering solutions where flush surface mounting and high tensile strength are paramount. The zinc-plated steel construction provides essential corrosion protection for machinery, electrical enclosures, and automotive assemblies exposed to moderate environmental conditions. With coarse UNC threading and Class 2A thread fit, these fasteners prevent loosening under vibration while enabling rapid installation in various substrates. The fully threaded design maximizes pull-out resistance, making them ideal for securing components where access is limited. Engineers specify these Phillips drive screws for applications requiring reliable fastening that maintains structural integrity without protruding hardware.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance ensuring precise dimensional accuracy. The UNC coarse thread profile (4-40) provides optimal engagement in most materials. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features standard 82° countersink angle and right-hand threading with 1-1/4" length in inch system measurements.
