S-90087A843 4-40 x 5/8" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Self-tapping efficiency - Cuts precise threads in aluminum, brass, cast iron, and sheet metal without pre-threading, reducing installation time and labor costs
• Superior corrosion resistance - Zinc-plated steel construction provides durable protection against rust and environmental degradation in industrial settings
• Enhanced driving stability - No. 1 Phillips drive design ensures secure tool engagement and reduces cam-out during high-torque applications
• Optimized thread engagement - Coarse UNC threading delivers superior holding power and vibration resistance in softer materials
• Streamlined installation - Blunt tip design with full threading allows for smooth entry and consistent thread formation throughout the fastener length
• Reliable performance standards - Manufactured to ASME B18.6.3 and SAE J933 specifications ensuring consistent quality and dimensional accuracy
• Versatile material compatibility - F-type thread cutting design performs effectively across multiple metal substrates with recommended No. 41 drill bit (0.096" diameter)

Professional Applications & Engineering Value

These 4-40 UNC thread cutting tapping screws solve critical fastening challenges in metal fabrication and assembly operations. The zinc-plated steel construction combined with the F-type thread cutting design eliminates the need for separate tapping operations, significantly reducing assembly time in aluminum, brass, cast iron, and sheet metal applications. The coarse UNC threading provides exceptional pull-out resistance in softer materials, while the pan head with No. 1 Phillips drive ensures reliable installation in confined spaces. Engineered for industrial reliability, these screws maintain thread integrity through repeated disassembly cycles, making them ideal for maintenance panels, electrical enclosures, and machinery components where vibration resistance is critical.

Specification Summary & Compliance

Manufactured to Class 2A thread tolerances with UNC coarse threading (4-40 size) and compliant with ASME B18.6.3 and SAE J933 specifications. Features standard pan head profile with 0.219" diameter and 5/8" fully threaded length. Designed for use with No. 41 drill bit (0.096" diameter) in thread cutting applications. Zinc-plated steel construction meets industrial corrosion resistance requirements while maintaining RoHS and REACH compliance for environmental safety standards.