S-90087A892 1/4"-20 x 4" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, ensuring long-term reliability in harsh industrial environments
• Excellent thread-cutting performance with Type F tapping design that creates strong, secure threads in aluminum, brass, cast iron, and sheet metal without pre-tapping
• Optimized drive efficiency featuring Phillips No. 3 drive for secure tool engagement and reduced cam-out during installation
• Enhanced material compatibility with coarse UNC 1/4"-20 threads designed specifically for softer materials and sheet metal applications
• Maximum holding power through fully threaded design that provides complete engagement along the entire 4" length
• Industry-standard compliance meeting ASME B18.6.3 specifications for consistent quality and performance in demanding applications
• Versatile pan head design with 0.492" diameter providing excellent bearing surface and professional finished appearance

Professional Applications & Engineering Value

These 1/4-20 zinc-plated steel tapping screws deliver exceptional engineering value by solving critical fastening challenges in aluminum, brass, cast iron, and sheet metal assemblies. The thread cutting design (Type F) eliminates the need for pre-tapped holes, significantly reducing installation time and labor costs while creating strong, permanent threads in base materials. The coarse UNC thread pattern provides superior pull-out resistance in softer materials, while the zinc plating offers reliable corrosion protection for extended service life in industrial environments. The Phillips No. 3 drive ensures efficient power transmission during installation, making these tapping screws ideal for high-volume production applications where reliability and speed are paramount.

Specification Summary & Compliance

These industrial-grade tapping screws feature precise 1/4"-20 UNC coarse threads with standard Class 2A tolerance for consistent fit and performance. The fully threaded 4" length with blunt tip and round shank cross-section ensures maximum material engagement. Manufactured to meet ASME B18.6.3 specifications and SAE J933 standards, these screws deliver reliable performance in demanding applications. The 0.492" pan head diameter with standard profile provides optimal clamping force distribution. Recommended drill bit size is No. 2 (0.221" diameter) for proper thread formation in various metals.