S-90086A684 1/4"-20 x 1" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior material durability with Black-Oxide Steel providing excellent corrosion resistance and extended service life in harsh industrial environments.
• Effortless installation through the thread cutting design and Phillips No. 3 drive, reducing assembly time and tool wear in materials like aluminum and cast iron.
• Secure fastening in various substrates with coarse UNC threading and fully threaded shank ensuring strong, vibration-resistant connections in sheet metal and brass.
• Flush, professional finish thanks to the standard flat head with 82° countersink angle, ideal for applications requiring a smooth surface.
• Reliable performance compliance meeting ASME B18.6.3 standards, ensuring dimensional accuracy and interchangeability for consistent results.
• Environmental and safety assurance with RoHS 3 compliance, making these screws safe for use in regulated industries and global markets.
• Versatile application range designed for use in aluminum, brass, cast iron, and sheet metal, eliminating the need for multiple screw types.

Professional Applications & Engineering Value

These 1/4"-20 UNC thread cutting tapping screws are engineered to address common challenges in industrial assembly, such as material fatigue and installation inefficiency. The Black-Oxide Steel construction enhances corrosion resistance, while the thread cutting capability allows for easy tapping without pre-drilled holes in tough materials like cast iron and aluminum. The coarse UNC thread and fully threaded design provide superior holding power, reducing the risk of loosening under vibration in sheet metal applications. By integrating a Phillips drive and standard flat head, these screws streamline workflows, minimize tool slippage, and ensure a secure fit in demanding environments, from construction to machinery manufacturing.

Specification Summary & Compliance

These screws adhere to Class 2A thread tolerances under the UNC thread system, ensuring precise fit and interchangeability. They comply with ASME B18.6.3 manufacturing specifications and are RoHS 3 (2015/863/EU) compliant, confirming they are free from hazardous substances. The design includes a 1/4"-20 thread size with coarse spacing, fully threaded shank, and standard dimensions for reliable performance in industrial fastening applications.