S-90086A663 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 aluminum, brass, cast iron, and sheet metal applications.
• Black-oxide steel construction provides enhanced corrosion resistance, ensuring long-term durability in demanding industrial environments.
• Coarse UNC threads offer superior grip and faster installation in softer materials, minimizing the risk of stripping.
• Phillips flat head with 82° countersink allows for a flush, clean finish that improves safety and aesthetics in assembled products.
• Fully threaded shank maximizes thread engagement along the entire length, providing a more secure and reliable fastening connection.
• Compliance with ASME B18.6.3 standards guarantees consistent quality, dimensional accuracy (Class 2A), and reliable performance for critical assemblies.
• RoHS 3 compliance ensures the product meets stringent environmental regulations, making it suitable for global markets and eco-conscious manufacturing.

Professional Applications & Engineering Value

This 2-56 UNC thread cutting screw is engineered to solve common fastening challenges in metal fabrication and assembly. Its thread-cutting (Type F) design and coarse thread spacing enable it to form precise, strong threads in materials like aluminum, brass, cast iron, and sheet metal without pre-tapping, significantly reducing production steps and potential for cross-threading. The black-oxide steel material provides a protective layer that resists rust, extending the screw's service life in humid or corrosive conditions. The Phillips drive and flat head profile with an 82° countersink angle ensure easy installation and a smooth surface finish, which is critical in applications where protrusions are not permissible. Compatible with a No. 49 drill bit, this screw offers a streamlined process for creating durable, high-strength joints in industrial equipment, enclosures, and metal frameworks.

Specification Summary & Compliance

This screw adheres to UNC thread standards with a size of 2-56 and features a Class 2A fit for standard tolerance applications. It is manufactured in compliance with the ASME B18.6.3 specification, ensuring dimensional accuracy and performance reliability. The product is RoHS 3 (2015/863/EU) Compliant, confirming it is free from hazardous substances, and meets relevant industry regulations for safe use in various engineering and manufacturing sectors.