S-90273A417 5-40 x 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 for extended service life in demanding environments
- High-strength performance with 60,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing capabilities
- Precision thread engagement with Class 2A fit and UNC coarse threads ensuring secure fastening and vibration resistance
- Efficient installation with Phillips No. 2 drive and standard 82° countersink angle for flush mounting and reduced assembly time
- Full threading coverage along the 1/4" length provides maximum grip and holding power in various materials
- Regulatory compliance with ASME B18.6.3 standards and environmental regulations (RoHS 3, REACH) for global industrial acceptance
- Right-hand thread design with coarse spacing enables quick assembly and disassembly in maintenance operations
Professional Applications & Engineering Value
These 5-40 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 moisture or harsh conditions. With their 82° countersink angle and Phillips drive, they eliminate protrusions in precision equipment while enabling efficient installation in confined spaces. The coarse UNC threads and Class 2A fit ensure reliable performance in soft metals and plastics, preventing stripping and maintaining joint integrity under vibration. Fully compliant with ASME B18.6.3 specifications, these screws meet rigorous industrial standards for dimensional accuracy and mechanical properties.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 standards with Class 2A thread fit tolerance for consistent engagement. Inch system measurements include 5-40 UNC coarse threads, 1/4" length, and 0.125" thread diameter. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in industrial applications worldwide.
