S-90273A115 4-40 x 1" 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 from 60,000 PSI tensile strength and full threading for maximum engagement and reliability
- Precise flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
- Optimized drive performance through Phillips No. 1 drive system ensuring secure installation and reduced cam-out risk
- Reliable thread engagement with UNC coarse threads and Class 2A fit providing consistent fastening in various materials
- Enhanced durability from Rockwell B70 hardness maintaining structural integrity under repeated stress
- Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for quality and environmental safety
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical engineering advantages in industrial fastening applications where reliability and precision are paramount. The zinc-plated steel construction provides essential corrosion protection for machinery, electrical enclosures, and assembly lines exposed to harsh conditions. With fully threaded design and coarse UNC threads, these screws offer superior pull-out resistance in metal, plastic, and composite materials, preventing loosening from vibration. The standard 82° countersink ensures flush mounting in precision equipment while the Phillips drive facilitates efficient installation in confined spaces. These flat head machine screws solve common industrial challenges including material fatigue, corrosion-induced failure, and inconsistent clamping force.
Specification Summary & Compliance
Manufactured to exacting standards with Class 2A thread fit tolerance and UNC coarse thread specifications ensuring consistent performance. Complies with ASME B18.6.3 manufacturing standards for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming hazardous substance restriction compliance. Thread specifications include right-hand direction, 4-40 UNC thread size, and coarse thread spacing optimized for industrial applications requiring reliable, high-strength fastening solutions.
