Kennametal 3757594 Turning Insert CNMG643UN KCK20 Carbide

Product Description

The KENNAMETAL 3757594 is a CNMG-style solid carbide turning insert in the KENLOC series, designed for high-productivity metal removal in turning, facing, and boring operations. It carries a multilayer PVD coating - AlTiN and AlCrN - applied over a carbide substrate graded KCK20, targeting wear resistance and thermal stability at the cutting edge. The insert features a 3/4-inch (0.7500 inch) inscribed circle, a 3/64-inch (0.0469 inch) corner radius, and a 0.2500-inch thickness. With four cutting edges and a neutral hand orientation, it delivers consistent performance across a range of setups. Cutting edge preparation is chamfered and honed for edge integrity under interrupted and continuous cuts.

This insert is suited for machining steel and cast iron workpieces, covering ISO material codes P and K. The UN chip breaker geometry handles turning, facing, and boring applications in both production and job-shop environments. The 80-degree diamond (C) insert shape with a negative rake angle and zero-degree relief provides robust support at the cutting edge, making it appropriate for rigid setups on CNC lathes and turning centers. Maximum depth of cut is 1.25 mm (0.0492 inch). Licensed machinists and CNC operators working with ferrous materials will find this insert fits standard CNMG toolholders using clamp or pin holding methods.

Key Features

• Multilayer AlTiN and AlCrN PVD coating on KCK20 carbide substrate for wear and heat resistance
• Four usable cutting edges with neutral hand orientation for versatile setup
• Chamfered and honed cutting edge prep for improved edge toughness
• UN chip breaker geometry supports turning, facing, and boring operations
• 80-degree diamond insert shape with negative rake for strong edge support in ferrous machining
• Conforms to both ANSI and ISO standards; industry standard number CNMG643UN

Compatibility

Designed for use in CNMG-style toolholders accepting a 3/4-inch inscribed circle insert with clamp or pin holding. Compatible with steel and cast iron workpiece materials (ISO P and K). Fits standard KENLOC series tooling. Insert size code 643.

Installation Notes

This insert is installed and indexed by qualified machinists or CNC setup technicians. Power down and de-energize the machine before indexing or replacing inserts. Verify that the toolholder pocket and clamping hardware are clean and free of chips before seating the insert. Never exceed the maximum depth of cut specification for the insert geometry, and confirm toolholder compatibility before use.