OSG Screw Thread Insert STI Tap: Straight Fute, 7/16"-20 UNF, H4 / 2B-3B, 4 Flute

The OSG Screw Thread Insert STI Tap is used to cut internal threads in pre-drilled holes for installing helical screw thread inserts. It is commonly applied in aerospace, automotive, and general manufacturing where thread repair or reinforcement is needed in softer materials like aluminum or cast iron.

The OSG STI Tap has a UNF thread size of 7/16"-20, a thread tolerance of H4 / 2B-3B, 4 flutes, and a bottoming chamfer. It is a straight flute, general purpose tap designed for screw thread insert applications. The manufacturer part number is 12601000.

You can source the OSG STI Tap 12601000 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 thread insert tapping.

Select an OSG STI tap that matches the thread insert's size and class. For a 7/16"-20 UNF insert, use the tap with the same thread designation and a tolerance of H4 / 2B-3B. Choose a bottoming chamfer for blind holes or a plug chamfer for through holes. Always verify the tap's flute count and coating for the workpiece material.