S-90096A535 1/4"-20 x 3/8" 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 harsh industrial environments.
• Enhanced installation efficiency through UNC coarse thread spacing and thread cutting design, reducing tapping time in materials like aluminum and cast iron.
• Secure, vibration-resistant fastening with a flanged head and external hex drive, providing excellent grip and preventing loosening under dynamic loads.
• Versatile material compatibility engineered for reliable performance in aluminum, brass, cast iron, and sheet metal without pre-threading.
• Optimized for high-strength applications with fully threaded shank and blunt tip, ensuring maximum holding power in heavy-duty assemblies.
• Streamlined procurement and compliance by meeting ASME B18.6.3 specifications and RoHS 3 standards, ensuring regulatory adherence.
• Reduced assembly errors with precise No. 2 drill bit pairing (0.221" diameter), facilitating accurate hole preparation.

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these zinc-plated steel hex flange tapping screws address common challenges in metal fabrication and assembly. The thread cutting design (Type F) and UNC coarse threads enable self-tapping in aluminum, brass, cast iron, and sheet metal, eliminating the need for separate tapping operations and reducing labor costs. The external hex drive with flange distributes clamping force evenly, minimizing surface damage and providing vibration resistance in machinery, automotive, and structural applications. By combining corrosion-resistant zinc plating with full threading, these screws ensure long-term reliability in outdoor or high-moisture settings, making them ideal for HVAC systems, enclosure assemblies, and heavy equipment manufacturing where durability and compliance with ASME B18.6.3 are critical.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with Class 2A dimensional tolerances, fully threaded shank, and blunt tip for consistent performance. Manufacturing adheres to ASME B18.6.3 specifications (referencing SAE J933), ensuring interchangeability and mechanical reliability. The product is RoHS 3 (2015/863/EU) compliant, confirming the absence of restricted hazardous substances, and is designed for use with a No. 2 drill bit (0.221" diameter) for precise hole alignment in applicable materials.