S-90086A601 2-56 x 1/8" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Self-tapping design eliminates the need for pre-tapped holes, reducing installation time and labor costs in aluminum, brass, cast iron, and sheet metal applications.
• Zinc-plated steel construction provides excellent corrosion resistance, ensuring long-term durability and reliability in various industrial environments.
• Coarse UNC thread spacing enables faster driving and superior holding power in softer materials, minimizing the risk of stripping.
• Phillips No. 1 drive with flat undercut head offers secure tool engagement and a flush, low-profile finish for streamlined assemblies.
• Fully threaded shank ensures maximum thread engagement along the entire length, delivering consistent clamping force and vibration resistance.
• 82° countersink angle and blunt tip facilitate precise alignment and easy starting, reducing installation errors and material damage.
• Compliance with ASME B18.6.3 and RoHS 3 guarantees consistent quality, dimensional accuracy, and environmental safety for regulated industries.

Professional Applications & Engineering Value

These 2-56 UNC zinc-plated steel tapping screws are engineered to address common fastening challenges in metalworking and assembly. The thread cutting design (Type F) and coarse thread spacing allow the screw to form its own mating threads in ductile materials like aluminum, brass, and cast iron, eliminating the need for costly tapping operations. The flat undercut head sits flush with the surface, preventing snagging and providing a clean aesthetic in finished products. Made from robust zinc-plated steel, these screws resist corrosion in demanding environments, while the Phillips No. 1 drive ensures efficient installation with standard tools. Ideal for securing sheet metal components, electrical enclosures, and machinery parts, they enhance assembly speed and reliability while reducing total cost of ownership.

Specification Summary & Compliance

This product features a 2-56 UNC thread size with coarse spacing and a Class 2A fit for reliable performance. The screw is fully threaded with a round shank and blunt tip, measuring 1/8" in length with a 0.162" head diameter. It is designed for use with a No. 49 drill bit (0.073" diameter) and an 82° countersink angle. Manufactured in compliance with ASME B18.6.3 (referencing SAE J933) for dimensional consistency and mechanical properties, and RoHS 3 (2015/863/EU) Compliant for environmental safety.