S-90086A603 2-56 x 1/4" 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 materials like aluminum, brass, and cast iron.
• Zinc-plated steel construction provides excellent corrosion resistance, ensuring long-term durability in demanding industrial environments.
• Type F thread cutting profile with coarse UNC threads creates strong, secure threads for maximum holding power and vibration resistance.
• Phillips flat head with standard 82° countersink allows for a flush, clean finish that minimizes snagging and improves safety.
• Fully threaded shank maximizes grip length and distributes load evenly, enhancing joint integrity across the entire fastened area.
• Compliance with ASME B18.6.3 specifications guarantees consistent quality, dimensional accuracy, and reliable performance in professional applications.
• RoHS 3 compliance ensures the screws are free from hazardous substances, making them suitable for use in regulated industries and global markets.

Professional Applications & Engineering Value

These 2-56 UNC zinc-plated steel tapping screws are engineered to solve common fastening challenges in metalworking and assembly. The thread cutting design (Type F) allows them to form precise mating threads in ductile materials like aluminum, brass, cast iron, and sheet metal, eliminating the risk of stripped threads and ensuring a tight, secure fit. The Phillips flat head with an 82° countersink angle sits flush with the surface, providing a smooth finish that is ideal for applications where protrusion is a concern. Made from robust zinc-plated steel, these screws offer superior resistance to rust and corrosion, extending the service life of assemblies in harsh conditions. Their coarse thread spacing and fully threaded body enhance grip and load distribution, making them a reliable choice for high-vibration environments and repetitive stress applications in industrial machinery, automotive components, and electronic enclosures.

Specification Summary & Compliance

This product features a 2-56 UNC thread size with coarse spacing and a Class 2A fit for standard industrial use. The screws are manufactured to meet ASME B18.6.3 specifications, ensuring dimensional accuracy and performance reliability. They are fully compliant with RoHS 3 (2015/863/EU) regulations, confirming they are free from restricted hazardous substances. The zinc-plated steel material and thread cutting (Type F) design adhere to industry standards for use in non-ferrous metals and sheet metal, with a recommended drill bit size of No. 49 (0.073" diameter) for optimal thread formation.