OSG Screw Thread Insert STI Tap: Spiral Fute, 9/16"-18 UNF, H3 / 2B-3B, 4 Flute

The OSG 0148008 is a spiral-flute STI tap designed for cutting internal threads in steel and stainless steel before installing screw thread inserts. Its bottoming chamfer and 4-flute geometry allow threading to the bottom of blind holes, making it ideal for aerospace, automotive, and general manufacturing applications.

This OSG STI tap has a thread size of 9/16"-18 UNF, a ground thread tolerance of H3 / 2B-3B, 4 flutes, and a bottoming chamfer. It is a spiral-flute type for steel and stainless steel. The manufacturer part number is 0148008. These specs ensure precise thread fit for STI inserts.

3G Electric supplies OSG taps like the 0148008 to customers worldwide. As a global industrial distributor, we handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time. We source and deliver genuine OSG tooling for your manufacturing needs.

Select an STI tap that matches the insert's thread size and pitch, such as 9/16"-18 UNF for this OSG tap. Use a bottoming chamfer for blind holes and spiral flutes for chip evacuation in steel. Ensure the tap tolerance (H3 / 2B-3B) aligns with the required thread class. Always follow the insert manufacturer's recommendations.