S-93878A106 4-40 x 1/4" Tapping Screws
Tapping 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
- Excellent thread-forming capability creates strong, permanent threads in steel, aluminum, brass and cast iron without pre-tapping
- Optimized drive efficiency with No. 1 Phillips head providing secure tool engagement and reduced cam-out risk
- Enhanced holding power through coarse UNC threading that maintains strong grip in various materials
- Full-length threading ensures maximum contact surface for superior fastening strength
- Versatile material compatibility specifically engineered for steel, aluminum, brass, cast iron and sheet metal applications
- Regulatory compliance meets RoHS 3 and REACH standards for global industrial use
Professional Applications & Engineering Value
These 4-40 UNC thread forming screws deliver exceptional engineering value by solving critical fastening challenges in industrial assembly. The zinc-plated steel construction provides reliable corrosion protection while maintaining high tensile strength. As SW-type tapping screws, they eliminate the need for pre-tapped holes, significantly reducing installation time and labor costs in steel, aluminum, brass, and cast iron components. The coarse thread spacing ensures superior resistance to vibration loosening, making them ideal for machinery, electrical enclosures, and automotive assemblies where reliability is paramount. The combination of No. 1 Phillips drive and pan head design offers both installation efficiency and a clean finished appearance.
Specification Summary & Compliance
These thread forming screws feature precision 4-40 UNC coarse threads with Class 2A tolerance for consistent performance. The fully threaded design and 1/4" length provide complete fastening coverage. Manufactured to industry standards for tapping screws, they comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in global industrial applications. The blunt tip design facilitates proper alignment during installation in prepared pilot holes.
