OSG Screw Thread Insert STI Tap: Spiral Fute, 7/8"-9 UNC, H3 / 2B-3B

The OSG Screw Thread Insert STI Tap is used to cut internal threads in multiple materials for installing screw thread inserts. It is commonly applied in aerospace, automotive, and general manufacturing where strong, wear-resistant threads are required in softer base materials.

The OSG 31503601 is a spiral-flute STI tap with a 7/8"-9 UNC thread size, H3 / 2B-3B tolerance, and 4 flutes. It is designed for threading holes that will accept screw thread inserts, suitable for multiple materials. The spiral flute design aids chip evacuation in blind-hole applications.

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 time on the OSG 31503601 or other OSG threading tools.

Select the OSG STI tap based on the screw thread insert's required internal thread size and pitch. For the 31503601, use it for 7/8"-9 UNC inserts. Ensure the tap tolerance (H3 / 2B-3B) matches the desired thread class. Always verify the insert manufacturer's specifications for proper fit.