S-90087A842 4-40 x 7/16" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior Thread Cutting Performance: Type F thread cutting design ensures clean, secure threads in aluminum, brass, cast iron, and sheet metal without pre-tapping, reducing installation time and labor costs.
• Enhanced Corrosion Resistance: Zinc-plated steel construction provides a durable protective layer, extending service life in various industrial environments and minimizing rust-related failures.
• Optimized Drive Efficiency: Phillips No. 1 drive offers reliable torque transmission and reduced cam-out risk, enabling faster assembly with standard tools while maintaining screw integrity.
• Full Thread Engagement: Fully threaded UNC coarse design maximizes grip strength and load distribution, preventing loosening under vibration and ensuring long-term joint stability.
• Standardized Pan Head Profile: Rounded pan head with 0.219" diameter delivers a low-profile finish and even clamping force, suitable for applications where flush mounting is preferred.
• Precision Compatibility: Designed for use with No. 41 drill bit (0.096" diameter), ensuring accurate pilot holes and minimizing material stress during installation in metals.
• Industry Compliance Assurance: Meets ASME B18.6.3 and SAE J933 specifications, guaranteeing consistent dimensional accuracy, thread quality, and performance reliability for professional use.

Professional Applications & Engineering Value

These 4-40 UNC thread cutting screws are engineered to address common challenges in metal assembly, such as stripping, cross-threading, and corrosion-induced failure. The zinc-plated steel material combined with the Type F tapping method creates durable threads directly in materials like aluminum, brass, and cast iron, eliminating the need for separate tapping operations and reducing production steps. The coarse UNC threads and fully threaded design enhance pull-out resistance in soft metals and sheet metal, while the Phillips No. 1 drive ensures efficient installation with minimal tool slippage. Ideal for HVAC, automotive, and machinery applications, these screws provide a reliable, self-tapping solution that maintains integrity under dynamic loads and harsh conditions, streamlining assembly lines and lowering total cost of ownership.

Specification Summary & Compliance

This product adheres to UNC coarse thread standards with a size of 4-40 and full threading, ensuring Class 2A dimensional tolerances for consistent fit. Manufactured in compliance with ASME B18.6.3 and SAE J933 specifications, it guarantees precise thread form, head dimensions, and mechanical properties. The zinc-plated finish meets general industry requirements for corrosion protection, and the design is suitable for use with standard No. 41 drill bits (0.096" diameter). While not explicitly stated for all regulations, typical industrial RoHS and REACH compliance can be expected for material safety in most applications.