S-90086A540 1/4"-20 x 3/4" 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 self-tapping installation with Type F thread cutting design, eliminating the need for pre-tapped holes and reducing assembly time.
• Excellent material compatibility for use in aluminum, brass, cast iron, and sheet metal, providing versatile fastening solutions.
• Secure and flush mounting with a standard flat head and 82° countersink angle, ensuring a smooth surface finish.
• Reliable drive engagement featuring a Phillips No. 3 drive style, minimizing cam-out and enhancing torque application.
• Robust holding power from UNC coarse threads and full threading, delivering strong, vibration-resistant connections.
• Guaranteed quality and safety through compliance with ASME B18.6.3 and RoHS 3 standards, ensuring consistent performance and environmental responsibility.

Professional Applications & Engineering Value

These 1/4"-20 zinc-plated steel tapping screws are engineered to address common challenges in metal assembly, such as stripping threads and corrosion-induced failure. The Type F thread cutting design allows for easy installation in tough materials like aluminum, brass, cast iron, and sheet metal, creating precise threads without pre-tapping. This reduces labor costs and equipment wear. The zinc plating offers a protective barrier against rust, ideal for outdoor or humid conditions. With a Phillips flat head and standard profile, these screws sit flush to prevent snagging, making them perfect for applications in automotive, machinery, and construction where reliability and a clean finish are critical.

Specification Summary & Compliance

This product features a 1/4"-20 UNC coarse thread with a thread diameter of 0.25" and a length of 3/4", ensuring dimensional accuracy per standard tolerances. It is fully threaded with a blunt tip and round shank cross-section for consistent performance. Manufactured to meet ASME B18.6.3 specifications (referencing SAE J933) for quality assurance, and is RoHS 3 (2015/863/EU) Compliant, adhering to environmental regulations for hazardous substance restrictions.