S-90279A110 4-40 x 1/2" 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, extending service life in demanding industrial environments
- Exceptional holding power from 60,000 psi tensile strength and Rockwell B69 hardness, preventing fastener failure under stress
- Quick installation and removal with Phillips No. 1 drive and rounded head design, reducing assembly time and labor costs
- Reliable thread engagement through fully threaded UNC coarse pattern and Class 2A fit, minimizing cross-threading risks
- Broad compatibility with standard 4-40 UNC components, ensuring easy replacement and inventory standardization
- Regulatory compliance meeting ASME B18.6.3, RoHS 3, and REACH standards, guaranteeing safety and environmental responsibility
- Optimized load distribution from rounded head profile, reducing surface damage and maintaining structural integrity
Professional Applications & Engineering Value
These zinc-plated steel screws with 4-40 UNC coarse threading deliver critical performance where vibration resistance and corrosion protection are paramount. The fully threaded design maximizes surface contact for superior grip in sheet metal assemblies, electrical enclosures, and machinery panels. Engineers specify these Phillips drive screws for their consistent Class 2A thread fit, which prevents jamming while maintaining precise alignment in high-volume production. The rounded head profile distributes clamping force evenly, protecting sensitive materials from indentation. Ideal for industrial maintenance and OEM equipment, these fasteners solve common challenges of environmental exposure and mechanical stress through their compliant ASME B18.6.3 manufacturing standards.
Specification Summary & Compliance
Manufactured to exact Class 2A thread fit tolerances with unified UNC coarse threads (4-40 size). Complies with ASME B18.6.3 dimensional standards for screw manufacturing. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for hazardous substance restrictions. Features consistent 1/2" length with full threading and standardized Phillips No. 1 drive configuration.
