S-90087A888 1/4"-20 x 2 1/2" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in harsh industrial environments
• Effortless installation through thread-cutting design that eliminates pre-tapping requirements in aluminum, brass, and cast iron
• Enhanced driving stability with Phillips No. 3 drive that minimizes cam-out and ensures secure fastening
• Reliable thread engagement with coarse UNC 1/4-20 threading that provides strong holding power in sheet metal applications
• Optimized head design featuring standard pan head profile for balanced clamping force and surface contact
• Full-threaded construction delivering maximum thread contact and pull-out resistance across the entire 2-1/2" length
• Industry-standard compliance meeting ASME B18.6.3 specifications for consistent quality and performance reliability

Professional Applications & Engineering Value

These 1/4-20 zinc-plated steel tapping screws deliver exceptional engineering value by solving common fastening challenges in aluminum, brass, cast iron, and sheet metal assemblies. The thread-cutting design eliminates the need for separate tapping operations, significantly reducing installation time and labor costs in high-volume manufacturing. The coarse UNC threading provides superior resistance to vibration loosening while the zinc-plated steel construction ensures durability against environmental exposure. With Phillips No. 3 drive compatibility, these F-type tapping screws offer reliable driving performance that prevents damage to both the fastener and application materials, making them ideal for industrial assembly lines where consistency and reliability are paramount.

Specification Summary & Compliance

These thread cutting screws feature precise UNC 1/4-20 coarse threading with standard Class 2A thread tolerances for consistent performance. The 2-1/2" fully threaded design ensures maximum engagement strength, while the 0.492" pan head diameter provides optimal clamping surface. Manufactured in compliance with ASME B18.6.3 and SAE J933 specifications, these fasteners deliver reliable dimensional accuracy and mechanical properties. The zinc-plated steel material meets industry standards for corrosion protection, and the recommended No. 2 drill bit (0.221" diameter) ensures proper hole preparation for efficient thread cutting in various metal substrates.