S-90086A638 1/4"-20 x 3 1/2" 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 in materials like aluminum, brass, and cast iron.
• High-strength, reliable fastening using coarse UNC 1/4"-20 threading, providing excellent pull-out resistance and vibration resistance.
• Flush, professional finish with a standard flat head and 82° countersink angle, ensuring a smooth surface and reduced snagging risks.
• Optimized drive engagement with a No. 3 Phillips drive, allowing for secure torque application and reduced cam-out during installation.
• Full-length threading for maximum grip along the entire 3 1/2" length, enhancing holding power in thick materials and sheet metal.
• Regulatory compliance assurance meeting ASME B18.6.3 standards and RoHS 3, ensuring safety, quality, and environmental responsibility.

Professional Applications & Engineering Value

These 1/4"-20 zinc-plated steel tapping screws are engineered to solve common industrial fastening challenges, such as material fatigue and installation inefficiency. The Type F thread cutting design allows for easy penetration into tough substrates like aluminum, brass, cast iron, and sheet metal, reducing the risk of stripping and ensuring durable threads without additional tapping. Made from zinc-plated steel, they offer enhanced corrosion resistance, ideal for outdoor or humid environments. The coarse UNC threading and flat head with an 82° countersink provide a secure, flush fit, minimizing protrusions in assembly lines. By integrating ASME B18.6.3 compliance, these screws deliver consistent performance, lowering maintenance costs and boosting productivity in automotive, machinery, and metal fabrication applications.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including UNC coarse threads with a size of 1/4"-20 and a standard flat head profile for consistent fit. It meets ASME B18.6.3 specifications (referencing SAE J933) for quality assurance, ensuring reliable performance in thread cutting applications. Additionally, it is fully RoHS 3 (2015/863/EU) compliant, confirming the absence of hazardous substances for safe use in various industries.