OSG Screw Thread Insert STI Tap: Spiral Fute, 9/16"-18 UNF, H4 / 2B-3B, 4 Flute

An OSG spiral-flute STI tap is used to cut internal threads for screw thread inserts in metalwork. It is designed for bottoming chamfer applications, producing threads that accept helical coil inserts in materials such as steel and aluminum. The spiral flute helps evacuate chips upward, making it suitable for through-hole and blind-hole threading.

The OSG 10801100 is a spiral-flute STI tap with a 9/16"-18 UNF thread size, H4 / 2B-3B tolerance, and 4 flutes. It has a bottoming chamfer for threading near the bottom of blind holes. The tap is designed for use with screw thread inserts and is made by OSG, a leading cutting tool manufacturer.

You can source OSG STI taps worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead times. 3G Electric supplies genuine OSG cutting tools for manufacturing and maintenance applications.

To select the correct OSG STI tap, match the tap thread size and pitch to the insert's requirements. For a 9/16"-18 UNF thread, use an STI tap with H4 / 2B-3B tolerance. Choose a spiral-flute design for chip evacuation in blind holes. Verify the chamfer type—bottoming for threads near hole bottoms—and ensure the tap is for the correct material.