S-90096A335 1/4"-20 x 7/8" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, ensuring long-lasting performance in harsh industrial environments.
• Effortless installation and high torque capability thanks to the external hex drive and flange design, which eliminates the need for separate washers and speeds up assembly.
• Reliable thread cutting in tough materials such as aluminum, brass, cast iron, and sheet metal without pre-tapped holes, reducing preparation time and labor costs.
• Consistent, secure fastening with fully threaded UNC coarse thread design, providing excellent grip and vibration resistance in coarse-grained materials.
• Enhanced durability and load distribution from the flanged head, which increases bearing surface and prevents loosening under stress.
• Compliance with industry standards including ASME B18.6.3 and RoHS 3, ensuring product reliability and environmental safety for global supply chains.
• Optimized for use with standard No. 2 drill bits (0.221" diameter), simplifying hole preparation and minimizing tooling requirements.

Professional Applications & Engineering Value

This heavy-duty zinc-plated steel hex flange tapping screw is engineered to address common challenges in metalworking and assembly, such as material fatigue and time-consuming installations. The Type F thread cutting design and UNC coarse threads allow it to form precise, durable threads directly in aluminum, brass, cast iron, and sheet metal, eliminating the need for pre-tapped holes and reducing assembly steps. The external hex drive ensures maximum torque application without slippage, while the integrated flange provides a wider clamping area to distribute load and resist vibration loosening. Ideal for automotive, machinery, and construction applications, this screw enhances structural integrity and operational efficiency in demanding environments.

Specification Summary & Compliance

This screw adheres to precise dimensional standards with UNC coarse thread (1/4"-20) and is fully threaded for consistent engagement. It meets ASME B18.6.3 specifications (referencing SAE J933) for quality and performance, and is RoHS 3 (2015/863/EU) compliant, ensuring it is free from hazardous substances. Manufactured with a blunt tip and round shank cross-section, it supports reliable, repeatable use in industrial fastening applications.