S-90087A106 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, reducing installation time and labor costs
• Enhanced corrosion resistance with zinc-plated steel construction, ensuring long-term reliability in demanding industrial environments
• Optimized drive engagement with Phillips No. 1 drive style for secure tool grip and reduced cam-out during high-torque applications
• Maximum holding power through fully threaded design and coarse UNC threads, providing excellent pull-out resistance in various metal substrates
• Streamlined installation process with blunt tip and standard pan head profile, allowing for consistent seating and flush surface finish
• Precision compatibility with No. 41 drill bit (0.096" diameter), ensuring accurate pilot holes and reduced material stress during tapping
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and RoHS 3 directives for quality consistency and environmental safety

Professional Applications & Engineering Value

These 4-40 UNC thread cutting tapping screws deliver exceptional engineering value by addressing common fastening challenges in metal fabrication and assembly. The zinc-plated steel construction combined with coarse thread spacing enables reliable performance in soft metals like aluminum and brass, where strip-out prevention is critical. The thread cutting design (Type F) creates precise mating threads in cast iron and sheet metal applications, eliminating the need for separate tapping operations and reducing production costs. With fully threaded coverage and right-hand thread direction, these screws maintain consistent clamping force across HVAC systems, electrical enclosures, and machinery components where vibration resistance is paramount. The Phillips drive and pan head style provide optimal torque transmission while maintaining a low-profile installation suitable for space-constrained industrial environments.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 specifications (SAE J933) with UNC coarse threads in 4-40 size, ensuring dimensional accuracy and interchangeability. Features include Class 2A thread tolerances, 1/4" length, and 0.112" thread diameter for precise fitment. Compliant with RoHS 3 (2015/863/EU) environmental standards, confirming absence of restricted hazardous substances. Designed for use with No. 41 drill bit (0.096" diameter) to achieve proper thread engagement in specified materials including aluminum, brass, cast iron, and sheet metal applications.