S-90279A106 4-40 x 1/4" ASME B18.6.3 Steel Round Head Phillips Screws
Steel Round Head Phillips 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 industrial environments
- Exceptional tensile strength rated at 60,000 psi ensures reliable performance under high-stress applications
- Optimized thread engagement with Class 2A fit and coarse UNC threading provides secure fastening with reduced cross-threading risk
- Enhanced driving efficiency through Phillips No. 1 drive design enables consistent torque application and quick installation
- Full-threaded design maximizes grip length and load distribution across the entire fastener
- Standard rounded head profile offers smooth surface finish and reduced snagging in assembled applications
- 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 zinc-plated steel screws deliver critical performance advantages for industrial assembly applications where corrosion resistance and mechanical reliability are paramount. The combination of Rockwell B69 hardness and 60,000 psi tensile strength ensures these rounded head Phillips screws maintain structural integrity in vibration-prone environments. The coarse thread design provides superior holding power in softer materials while the Class 2A thread fit guarantees consistent engagement without binding. Ideal for electrical enclosures, machinery guards, and equipment panels, these fully threaded fasteners offer engineers a compliant solution that meets rigorous ASME B18.6.3 standards while providing dependable, long-term fastening performance.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse threading (4-40 thread size). These 1/4" length screws feature a standard rounded head profile with Phillips No. 1 drive. Full compliance with ASME B18.6.3 manufacturing specifications, RoHS 3 (2015/863/EU) environmental directives, and REACH (EC 1907/2006) chemical safety regulations ensures product quality and regulatory adherence for industrial applications.
