S-90086A609 4-40 x 1/2" 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 demanding industrial environments
• Effortless installation in aluminum, brass, cast iron, and sheet metal without pre-tapping, thanks to the thread cutting (Type F) design
• Secure and reliable fastening with coarse UNC threading and full threading along the 1/2" length, providing maximum grip and pull-out resistance
• Wide compatibility with standard No. 41 drill bits (0.096" diameter) and 82° countersink angles, simplifying integration into existing assemblies
• Enhanced torque transmission via the Phillips No. 1 drive, reducing cam-out risks and ensuring consistent seating in the flat head profile
• Industry-standard compliance with ASME B18.6.3 specifications, guaranteeing dimensional accuracy and mechanical reliability
• Environmentally responsible manufacturing with RoHS 3 compliance, meeting global regulatory requirements for hazardous substance restrictions

Professional Applications & Engineering Value

These 4-40 UNC zinc-plated steel tapping screws are engineered to address common challenges in metalworking and assembly, such as stripped threads and material fatigue. The thread cutting (Type F) design allows for self-tapping in aluminum, brass, cast iron, and sheet metal, eliminating the need for separate tapping operations and reducing labor costs. The coarse thread spacing and fully threaded shank ensure rapid installation and superior holding power in soft or brittle materials, minimizing the risk of loosening under vibration. Combined with the Phillips flat head and standard 82° countersink, these screws provide a flush finish that enhances aesthetics and safety in automotive, HVAC, and machinery applications. Their robust construction supports high-stress environments, making them ideal for industrial fasteners in OEM and MRO settings.

Specification Summary & Compliance

This product adheres to UNC Class 2A thread tolerances with a 4-40 thread size, 1/2" length, and standard flat head profile. Manufacturing and dimensional accuracy comply with ASME B18.6.3 specifications (referencing SAE J933), ensuring consistent performance. The screws are RoHS 3 (2015/863/EU) Compliant, confirming the absence of restricted hazardous substances, and are suitable for use with recommended drill bit sizes (e.g., No. 41, 0.096" diameter) for optimal thread engagement.