S-90087A108 4-40 x 1/2" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Self-tapping efficiency – Cuts precise threads in materials like aluminum, brass, and cast iron without pre-threading, reducing assembly time and labor costs.
• Superior corrosion resistance – Zinc-plated steel construction provides reliable protection against rust, extending service life in demanding industrial environments.
• Optimized drive engagement – Phillips No. 1 drive ensures secure tool engagement and minimizes cam-out, enhancing installation speed and reducing fastener damage.
• High-strength coarse threading – UNC coarse thread spacing delivers excellent holding power and vibration resistance in sheet metal and softer materials.
• Full-thread design for maximum grip – Fully threaded shank distributes clamping force evenly, ensuring a secure, reliable connection across the entire fastener length.
• Industry-standard compliance – Manufactured to ASME B18.6.3 specifications, guaranteeing dimensional accuracy, performance reliability, and interchangeability.
• Environmental and safety adherence – RoHS 3 compliant, ensuring safe use in regulated applications without hazardous substances.

Professional Applications & Engineering Value

These 4-40 UNC thread cutting tapping screws are engineered to solve common fastening challenges in metalworking and assembly. The zinc-plated steel material offers durability and corrosion resistance, while the thread cutting (Type F) design allows for direct installation into aluminum, brass, cast iron, and sheet metal without pre-tapped holes—eliminating the need for additional threading operations. The coarse thread spacing and blunt tip enhance chip clearance and reduce material stress, preventing stripping in softer substrates. With a Phillips drive and standardized dimensions per ASME B18.6.3, these screws ensure consistent performance in HVAC, automotive, and machinery applications, streamlining production and reducing total cost of ownership.

Specification Summary & Compliance

This product features a 4-40 UNC coarse thread with Class 2A tolerance, ensuring precise fit and reliable performance. The screws are fully threaded, have a pan head style, and are designed for use with a No. 41 drill bit (0.096" diameter). Manufacturing and quality adhere to ASME B18.6.3 standards, and the product is RoHS 3 (2015/863/EU) Compliant, meeting environmental and safety regulations for industrial use.