Kennametal 3648474 Indexable Drill Insert Dftmd KC7140

Product Description

The KENNAMETAL 3648474 is a solid carbide indexable drill insert designed for use in indexable drilling tool bodies that accept DFT-style inserts. It features the KC7140 manufacturer grade with a PVD-applied TiCN and TiN dual-layer coating, delivering wear resistance and heat control during high-feed drilling operations. The insert carries an 84-degree trigon shape with a neutral hand orientation, a 0.4724 inch (12 mm) inscribed circle, and a 0.0313 inch (0.79 mm) corner radius. A 9-degree relief angle and the MD chipbreaker geometry help control chip flow and reduce cutting forces. This insert is installed and serviced by machinists and tooling technicians in production and job-shop environments.

This insert is suited for use in metal-cutting drilling operations on CNC machining centers, lathes with live tooling, and manual drilling setups where indexable carbide tooling is specified. It is appropriate for applications in steel, cast iron, and similar materials where PVD-coated carbide grades are commonly selected. The MD chipbreaker designation is intended for medium-duty drilling conditions. Insert size designation is 070408, with a length of 0.3126 inches (7.94 mm) and a hole diameter of 0.1732 inches (4.4 mm), making it compatible with tool bodies specifying those dimensions.

Key Features

• KC7140 grade with PVD TiCN and TiN dual-layer coating for wear and thermal resistance
• 84-degree trigon (triangular) insert shape with neutral hand orientation
• MD chipbreaker geometry for medium-duty drilling chip control
• 12 mm (0.4724 inch) inscribed circle with 0.79 mm (0.0313 inch) corner radius
• 9-degree relief angle to reduce flank wear during drilling
• Insert size 070408 for direct cross-reference in compatible DFT-style tool bodies

Compatibility

Designed as an OEM-style replacement insert for indexable drill tool bodies that accept DFT insert style, 070408 insert size, with a 4.4 mm mounting hole diameter. Verify tool body specifications before ordering.

Installation Notes

Installation is performed by qualified machinists or tooling technicians. Power down and lock out the machine before indexing or replacing inserts. Use the correct torx or hex key specified by the tool body manufacturer when seating the insert and tighten only to the tool body manufacturer's specified procedure. Inspect the insert pocket and clamping screw for wear or damage before installing a new insert.