S-90096A301 4-40 x 1/4" 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.
• Efficient thread-cutting action in pre-drilled holes eliminates the need for separate tapping, saving assembly time and labor costs.
• Enhanced load distribution from the integrated flange, reducing the risk of surface damage and providing a more secure, vibration-resistant fastening.
• High-torque capability with the external hex drive and coarse UNC threads, ensuring a tight, reliable installation in materials like aluminum and cast iron.
• Versatile material compatibility for use in aluminum, brass, cast iron, and sheet metal, making it a multi-purpose solution for various assemblies.
• Guaranteed dimensional accuracy and performance consistency, manufactured to meet the stringent ASME B18.6.3 standard.
• Environmental and safety compliance with RoHS 3 regulations, ensuring safe use in regulated markets.

Professional Applications & Engineering Value

This 4-40 UNC tapping screw is engineered to solve common fastening challenges in metalworking and assembly. The zinc-plated steel material provides a protective barrier against rust and corrosion, crucial for maintaining integrity in humid or outdoor settings. Its thread-cutting design with coarse UNC threads allows for easy, self-tapping installation into ductile materials like aluminum, brass, and cast iron, eliminating the need for pre-formed threads and reducing the risk of strip-out. The flanged hex head combines the high torque transmission of an external hex drive with the stability of a built-in washer, distributing clamp load effectively to prevent loosening under vibration. Ideal for sheet metal fabrication and machinery assembly, this screw ensures reliable, long-lasting connections while streamlining the production process.

Specification Summary & Compliance

This screw features a No. 4-40 UNC coarse thread with a 1/4" length and is fully threaded for maximum grip. It is designed to be used with a No. 41 drill bit (0.096" diameter) for optimal thread engagement. Manufactured in compliance with ASME B18.6.3 specifications, ensuring consistent dimensional accuracy and performance. The product is also RoHS 3 (2015/863/EU) Compliant, meeting environmental standards for hazardous substance restrictions.