OSG Screw Thread Insert STI Tap: Straight Fute, 1/2"-13 UNC, H4 / 2B-3B, 4 Flute

The OSG Screw Thread Insert STI Tap is used to cut internal threads in metal or plastic for installing helical screw thread inserts. It is commonly applied in aerospace, automotive, and general manufacturing where thread repair or reinforcement is needed. The bottoming chamfer allows threading close to the bottom of a blind hole.

This OSG STI Tap has a 1/2"-13 UNC thread size, H4 / 2B-3B tolerance, 4 flutes, and a bottoming chamfer. It is designed for general-purpose tapping of screw thread insert holes. The straight flute geometry provides good chip evacuation in through-hole applications. The manufacturer part number is 12601200.

You can source the OSG STI Tap 12601200 through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time. We supply genuine OSG tooling for manufacturing and repair operations.

Select an STI tap that matches the thread insert size and class of fit. For a 1/2"-13 UNC insert, use a tap with the same thread designation and an H4 tolerance for 2B-3B fit. The bottoming chamfer is ideal for blind holes. Always verify the tap's flute count and material compatibility with your workpiece.