S-90086A636 1/4"-20 x 1 3/4" 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 with Type F design, creating precise threads in aluminum, brass, cast iron, and sheet metal without pre-tapping
• Optimized drive efficiency through Phillips No. 3 drive style, providing secure torque transfer and reducing cam-out risks
• Enhanced flush mounting capability with standard 82° flat head profile, ensuring smooth surface finishes in countersunk applications
• Reliable fastening strength with UNC coarse 1/4"-20 threading and full-length threads, delivering maximum grip in various materials
• Industry-standard compliance meeting ASME B18.6.3 specifications, ensuring consistent quality and interchangeability
• Environmental responsibility with RoHS 3 compliance, supporting sustainable manufacturing practices

Professional Applications & Engineering Value

These zinc-plated steel tapping screws with Type F thread cutting design solve critical assembly challenges in metalworking applications. The UNC coarse thread spacing combined with the thread-cutting tapping method eliminates the need for separate tapping operations, significantly reducing installation time and labor costs in aluminum, brass, cast iron, and sheet metal components. The fully threaded 1 3/4" length ensures maximum thread engagement and pull-out resistance, while the 82° flat head provides seamless countersinking for aerodynamic and aesthetic surfaces. Engineered for heavy-duty industrial fastening, these screws maintain structural integrity under vibration and load stress, making them ideal for automotive, machinery, and metal fabrication applications where reliability and efficiency are paramount.

Specification Summary & Compliance

This 1/4"-20 tapping screw features UNC coarse thread spacing with standard Class 2A thread tolerances for consistent fit and performance. Manufacturing and dimensional specifications strictly comply with ASME B18.6.3 standards (SAE J933), ensuring mechanical reliability and interchangeability. The product is RoHS 3 (2015/863/EU) Compliant, meeting environmental regulations for hazardous substance restrictions. The zinc-plated steel material provides corrosion protection while maintaining the mechanical strength required for thread cutting applications in various metal substrates.