S-90087A886 1/4"-20 x 3/8" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments
• Excellent thread-cutting performance in multiple materials including aluminum, brass, cast iron, and sheet metal without requiring pre-tapped holes
• Reliable fastening power with UNC coarse threading that provides stronger holding strength and reduced cross-threading risk
• Optimized drive efficiency through Phillips No. 3 drive design ensuring secure tool engagement and reduced cam-out
• Maximum thread engagement with fully threaded design for consistent holding power along the entire fastener length
• Industry-standard compliance meeting ASME B18.6.3/SAE J933 specifications for guaranteed dimensional accuracy and performance
• Simplified installation with compatible No. 2 drill bit size (0.221") for precise hole preparation and reduced assembly time

Professional Applications & Engineering Value

These 1/4"-20 zinc-plated steel tapping screws deliver exceptional engineering value in metal fabrication and assembly operations. The thread cutting design (Type F) eliminates the need for separate tapping operations, significantly reducing labor costs and installation time in aluminum, brass, cast iron, and sheet metal applications. The zinc-plated steel construction provides essential corrosion protection for industrial environments, while the UNC coarse thread profile ensures rapid installation and superior resistance to vibration loosening. The Phillips No. 3 drive offers reliable torque transmission, and the fully threaded configuration maximizes pull-out strength across the entire engagement length, making these self-tapping screws ideal for high-volume production environments where reliability and efficiency are critical.

Specification Summary & Compliance

These tapping screws feature precision 1/4"-20 UNC coarse threads with standard Class 2A thread tolerances for consistent performance. The fasteners maintain 0.25" thread diameter with 0.492" pan head diameter and 3/8" length for standardized applications. Manufacturing and dimensional compliance strictly adheres to ASME B18.6.3 and SAE J933 specifications, ensuring interchangeability and reliability across industrial applications. The right-hand thread direction and blunt tip design provide controlled thread formation, while the construction meets industry standards for material quality and performance consistency.