Walter-prototyp 7569497 Spiral Flute Sti Tap 6-32 Unc

Product Description

The WALTER-PROTOTYP 7569497 is a spiral flute STI (Screw Thread Insert) tap designed to cut 6-32 UNC internal threads in materials that will receive helical wire inserts. Built from high-speed steel, this two-flute tap features a semi-bottoming chamfer for threading close to the bottom of a blind hole. The H9 thread limit ensures the oversized relief needed so a standard thread insert seats correctly after installation. At 70 millimeters overall length with an 8 millimeter thread length, it fits standard tap handles and machine tool chucks used in precision tapping operations.

This tap is used in applications where a worn or damaged 6-32 UNC thread must be restored using a helical coil insert. Common install scenarios include aerospace, automotive, and general machine shop work where parent material is too thin or soft to hold a standard thread reliably. The right-hand flute direction matches standard right-hand threading practice. It is appropriate for use in drill presses, CNC machining centers, and hand tapping operations. Machinists, tool-and-die technicians, and maintenance mechanics are the primary users of this tap.

Key Features

• Spiral flute geometry evacuates chips upward, reducing clogging in blind holes
• Semi-bottoming chamfer allows threading close to the bottom of a blind hole with minimal unthreaded material remaining
• H9 thread limit provides the oversized tolerance required for STI insert installation
• High-speed steel construction offers good wear resistance across a range of workpiece materials
• Two-flute design in 6-32 UNC suits small-diameter precision tapping
• Right-hand flute direction compatible with standard tapping equipment and toolholders

Compatibility

Designed for use as an STI tap producing 6-32 UNC threads sized to accept standard helical coil screw thread inserts. Fits tap handles and machine chucks accepting a 4.93 millimeter shank diameter.

Installation Notes

A licensed machinist or qualified maintenance technician should install this tap following standard tapping procedures. Ensure the workpiece is securely fixtured and the spindle or tap handle is properly aligned before cutting begins. Use appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality. Follow the insert manufacturer's drill and tap size chart to confirm correct drill diameter before tapping.