S-90086A605 2-56 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 for extended service life in demanding industrial environments
• Excellent material compatibility with thread-cutting design that creates strong, permanent threads in aluminum, brass, cast iron, and sheet metal
• Enhanced driving efficiency with Phillips No. 1 drive that provides reliable torque transfer and reduces cam-out during installation
• Optimal flush mounting with standard flat head profile and 82° countersink angle for smooth, secure surface finishes
• Maximum holding power through fully threaded UNC coarse thread design that ensures superior grip and vibration resistance
• Industry-standard compliance meeting ASME B18.6.3 specifications for consistent quality and performance reliability
• Environmental responsibility with RoHS 3 compliance, ensuring safe use in regulated applications

Professional Applications & Engineering Value

These 2-56 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 pre-tapped holes, significantly reducing installation time and labor costs while creating durable, permanent threads in various materials. The Phillips flat head configuration ensures flush mounting in countersunk applications, preventing snagging and providing clean aesthetic finishes. Particularly valuable in sheet metal, aluminum, brass, and cast iron applications, these screws maintain structural integrity under vibration and load stress. The coarse UNC thread pattern combined with full threading delivers superior pull-out resistance, making them ideal for high-stress industrial fastening where reliability is paramount. Their zinc-plated surface treatment provides essential corrosion protection in challenging environments, extending service life and reducing maintenance requirements.

Specification Summary & Compliance

These tapping screws feature precise 2-56 UNC coarse threads with standard Class 2A tolerances for consistent fit and performance. The 3/8" length and 0.086" thread diameter provide optimal fastening dimensions for various material thicknesses. Manufactured to meet ASME B18.6.3 specifications (SAE J933) for dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) regulations for environmental safety. The standard flat head profile with 82° countersink angle ensures proper seating in prepared holes, while the No. 49 drill bit size (0.073" diameter) is recommended for optimal thread engagement in the specified materials.