S-90086A606 4-40 x 1/4" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior thread cutting performance in aluminum, brass, cast iron, and sheet metal without pre-tapped holes
• Enhanced corrosion resistance with zinc-plated steel construction for extended service life in industrial environments
• Maximum holding power achieved through fully threaded design and coarse UNC thread pattern
• Secure installation with Phillips No. 1 drive and flat undercut head that sits flush with material surfaces
• Precision compatibility with No. 41 drill bit (0.096") and 82° countersink for professional installation
• Reliable compliance with ASME B18.6.3 specifications ensuring consistent quality and performance
• Environmental responsibility through RoHS 3 compliance for safe use in regulated applications

Professional Applications & Engineering Value

These 4-40 UNC zinc-plated steel tapping screws deliver exceptional engineering value in metal fabrication and assembly operations. The thread cutting Type F design eliminates the need for separate tapping operations, significantly reducing installation time and labor costs in aluminum, brass, cast iron, and sheet metal applications. The coarse UNC thread pattern provides superior pull-out resistance while the zinc-plated steel construction offers reliable corrosion protection in demanding industrial environments. The flat undercut head with 82° countersink ensures flush mounting without surface protrusions, making these self-tapping screws ideal for applications where smooth finishes and secure fastening are critical. The combination of Phillips No. 1 drive and full threading ensures consistent installation torque and maximum thread engagement for long-term reliability.

Specification Summary & Compliance

These 4-40 UNC coarse thread tapping screws maintain precise dimensional accuracy with Class 2A thread tolerances and feature a blunt tip design for controlled thread cutting. Manufactured to meet ASME B18.6.3 specifications (SAE J933) for consistent performance in industrial applications. The screws are RoHS 3 (2015/863/EU) Compliant and designed for use with No. 41 drill bit (0.096" diameter) and 82° countersink angles. The zinc-plated steel material and Type F thread cutting design ensure reliable performance in various metal substrates while maintaining compliance with industry standards for quality and safety.