Kennametal 1157971 Indexable Drill Insert KC720 Carbide

Product Description

The KENNAMETAL 1157971 is a solid carbide indexable drill insert designed for high-performance drilling applications in metal cutting operations. Manufactured to the KC720 grade with a PVD-applied TiN coating, this insert delivers wear resistance and edge retention under demanding cutting conditions. It features an 84-degree trigon shape with an MD chipbreaker geometry, a 0.3937-inch (10 mm) inscribed circle, and a corner radius of 0.0315 inches (0.80 mm). The insert thickness is 0.1476 inches and the overall length is 0.2606 inches. Licensed machinists and CNC operators working with indexable drill tooling systems install this insert as part of a modular drilling setup.

This insert is suited for use in indexable drill bodies that accept the DFT insert style with an 06T308 insert size designation. Typical applications include roughing and through-hole drilling in ferrous and non-ferrous materials across production machining environments, both in job shops and manufacturing facilities. The MD chipbreaker is optimized for chip control in materials classified under material grades C1 through C5, making it a versatile choice across a range of workpiece materials.

Key Features

• KC720 grade solid carbide construction with PVD TiN coating for extended tool life
• MD chipbreaker geometry for reliable chip control during drilling
• 84-degree trigon insert shape for compatibility with DFT-style indexable drill bodies
• 0.3937-inch (10 mm) inscribed circle and 0.0315-inch (0.80 mm) corner radius for precise cutting geometry
• 8-degree relief angle reduces friction and heat buildup at the cutting edge
• Insert size 06T308 for straightforward replacement and tooling standardization

Compatibility

Designed for use in indexable drill bodies that accept the DFT insert style, insert size 06T308, with a 0.1732-inch hole diameter. Suitable for material grades C1 through C5 as specified by the manufacturer.

Installation Notes

This insert is installed and indexed by qualified machinists or CNC tooling technicians. Before replacing inserts, power down the machine and follow lockout/tagout procedures per applicable safety standards. Use the correct torque wrench and manufacturer-recommended clamping hardware to seat the insert properly in the pocket. Inspect the insert pocket and clamping components for wear or damage before installing a new insert.