S-90087A879 12-24 x 3/8" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Self-tapping efficiency: Cuts precise threads directly into materials, eliminating pre-tapping and reducing assembly time in aluminum, brass, cast iron, and sheet metal.
• Superior corrosion resistance: Zinc-plated steel construction provides reliable protection against rust, extending service life in demanding industrial environments.
• Optimized drive engagement: Phillips No. 3 drive ensures secure tool engagement and reduces cam-out risk for consistent, high-torque installation.
• Robust thread holding power: Coarse UNC threading and full threading along the 3/8" length deliver enhanced pull-out resistance in softer metals.
• Broad material compatibility: Type F thread cutting design is engineered for reliable performance across diverse substrates without stripping.
• Standardized dimensional accuracy: Manufactured to ASME B18.6.3 specifications for guaranteed interchangeability and fit in OEM and MRO applications.
• Streamlined inventory management: Combines multiple material applications (aluminum, brass, cast iron, sheet metal) into a single high-performance fastener solution.

Professional Applications & Engineering Value

These 12-24 UNC thread cutting tapping screws solve critical fastening challenges in metal fabrication and assembly operations. The zinc-plated steel construction provides essential corrosion protection for equipment exposed to industrial atmospheres, while the Type F thread cutting design with coarse threading creates durable, permanent threads in ductile materials without requiring pre-tapped holes. This eliminates tapping operations and reduces labor costs in high-volume production environments. The Phillips No. 3 drive offers familiar, efficient installation across manufacturing floors, and the fully threaded 3/8" length ensures maximum thread engagement in both thin sheet metal and thicker cast components. Engineered specifically for aluminum, brass, cast iron, and sheet metal applications, these screws prevent stripping and maintain clamping force in vibration-prone assemblies.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 dimensional standards with UNC coarse thread profile (12-24 size) and Class 2A thread tolerances for reliable interchangeability. Complies with SAE J933 specifications for thread cutting screws. The zinc-plated steel finish meets industrial corrosion protection requirements, and the screws are designed for use with No. 11 drill bit (0.191" diameter) for proper hole preparation. Suitable for RoHS and REACH compliant manufacturing environments.