OSG Screw Thread Insert STI Tap: Spiral Fute, 7/16"-20 UNF, H4 / 2B-3B

This OSG spiral-flute STI tap is designed for cutting internal threads in aluminum and non-ferrous materials before installing screw thread inserts. It is commonly used in aerospace, automotive, and general manufacturing where strong, wear-resistant threads are required in softer base materials.

The OSG STI tap has a thread size of 7/16"-20 UNF, a ground thread tolerance of H4 / 2B-3B, and a 2-flute spiral-flute design for efficient chip evacuation. The manufacturer part number is 1303901208. It is optimized for tapping aluminum and other non-ferrous metals.

3G Electric supplies OSG STI taps worldwide. As a global industrial distributor, we handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time on the OSG 1303901208 spiral-flute tap. We source and deliver to meet your production needs.

Select an STI tap with the same thread size and pitch as the insert you will install. For aluminum, use a spiral-flute design like this OSG 2-flute tap to clear chips. The H4 / 2B-3B tolerance ensures proper fit for the insert. Always match the tap to the material and thread class required.