S-93878A122 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 harsh industrial environments
- Excellent thread-forming capability creates strong, permanent threads in steel, aluminum, brass, cast iron and sheet metal without pre-tapping
- Reliable fastening performance with UNC coarse threads providing superior holding power and reduced cross-threading risk
- Easy installation and removal with standard No. 1 slotted drive compatible with common hand tools
- Optimal material engagement through fully threaded blunt tip design for maximum grip length and pull-out resistance
- Secure environmental compliance meeting RoHS 3 standards for safe use in regulated applications
- Versatile industrial application with pan head design offering good bearing surface and clean appearance
Professional Applications & Engineering Value
These 4-40 UNC thread forming tapping screws deliver exceptional engineering value by eliminating the need for pre-tapped holes, significantly reducing assembly time and labor costs in steel, aluminum, brass, cast iron, and sheet metal applications. The zinc-plated steel construction provides reliable corrosion protection while maintaining the strength required for demanding industrial environments. The thread forming design creates precise, strong threads that resist vibration loosening and maintain clamping force over time. With their pan head style and No. 1 slotted drive, these screws offer both practical installation benefits and a professional finished appearance, making them ideal for electrical enclosures, machinery assemblies, and metal fabrication projects where reliability and efficiency are paramount.
Specification Summary & Compliance
These screws feature precision UNC coarse threads (4-40) with Class 2A tolerance for consistent performance, a 0.219" head diameter pan head configuration, and 1/4" length with full threading. Manufactured to industry standards for thread forming screws, they require a #37 drill bit (0.104" diameter) for proper installation. The products are fully RoHS 3 (2015/863/EU) Compliant, ensuring environmental responsibility and regulatory compliance for global industrial applications.
