Kennametal 1799390 Threading Insert KC5025 Carbide 12 Tpi

Product Description

The KENNAMETAL 1799390 is a carbide threading insert from the Top Notch series, designed for cutting internal UN threads in machining applications. Manufactured to the NTC3L12I geometry, this left-hand insert carries the KC5025 grade with a PVD-applied TiAlN finish coating. It cuts at 12 threads per inch (TPI) with a 60-degree included angle and a corner radius of 0.0039 inches (0.1 mm). The insert measures 0.1949 inches thick and sits at a tip-to-top height of 0.1480 inches. It is suited for use in CNC lathes and turning centers by machinists and tool-and-die professionals running internal thread operations.

This insert is intended for internal threading on UN-standard thread forms at 12 TPI. The left-hand configuration makes it appropriate for reverse-thread or left-hand-thread applications on workpieces where standard right-hand geometry is not suitable. The KC5025 carbide grade with TiAlN PVD coating provides wear resistance for threading steel and similar materials in production turning environments. Insert size is 3, consistent with Top Notch toolholder pockets designed for that insert class.

Key Features

• KC5025 carbide grade with PVD TiAlN finish for wear resistance in threading operations
• NTC3L12I geometry: left-hand, internal thread, 12 TPI, 60-degree included angle
• Corner radius of 0.0039 inches (0.1 mm) for precise thread root form
• UN thread standard compatibility for unified inch thread profiles
• Top Notch series insert size 3 for use in compatible Top Notch toolholders
• Material grades C2 and C6 classification

Compatibility

Designed for use in Top Notch series toolholders that accept size 3 NTC-style inserts. Specific compatible toolholder model numbers were not provided in available product data; verify pocket size and insert style against your toolholder documentation before ordering.

Installation Notes

Threading inserts of this type are seated and clamped by a licensed machinist or qualified shop technician; ensure the machine spindle is fully stopped and the tool turret is locked before changing inserts. Use the appropriate Top Notch clamping screw and torque per toolholder manufacturer guidelines. Inspect the insert pocket for chips or debris before seating a new insert to prevent improper seating or premature edge failure. Left-hand inserts require confirmation of spindle rotation direction and toolholder orientation before initiating a threading pass.