Kennametal 3753996 CNMG642RN KCP40 Carbide Turning Insert

Product Description

The KENNAMETAL 3753996 is a CNMG642RN indexable turning insert in the KCP40 carbide grade, designed for general turning, facing, and boring operations on steel and stainless steel workpieces. It features a multilayer CVD coating of TiN, TiCN, and Al2O3 applied via MTCVD process, which provides high toughness against steel (P-class) and moderate wear resistance with toughness for stainless steel (M-class). The insert measures 19.34 mm (0.7616 inches) in length with a 3/4 inch inscribed circle and a 1/32 inch corner radius. It carries four usable cutting edges and is rated for both roughing and medium machining chip-breaking conditions under the RN chip breaker designation.

This insert is suited for use in KENLOC-series toolholders in production turning environments handling steel and stainless steel components. Typical applications include external turning, face turning, and boring on lathes and turning centers in both job-shop and higher-volume manufacturing settings. The neutral hand orientation and 80-degree diamond (rhombic) insert shape make it versatile across a range of approach angles and workpiece geometries. Licensed machinists and CNC turning technicians installing this insert should reference holder documentation to confirm clamp or pin retention compatibility.

Key Features

• KCP40 carbide grade with multilayer CVD TiN/TiCN/Al2O3 coating for steel and stainless steel cutting
• RN chip breaker geometry rated for roughing and medium machining operations
• 80-degree diamond (C-shape) insert with negative rake and negative side clearance for rigid, stable cutting
• Four cutting edges per insert, neutral hand orientation
• Compatible with clamp and pin insert holding methods
• Maximum depth of cut: 0.0492 inches (1.25 mm)

Compatibility

Designed for use in KENLOC-series turning toolholders accepting CNMG-style inserts with clamp or pin retention. Conforms to ANSI insert code CNMG642 and ISO insert code CNMG190608. Suitable for primary workpiece materials classified as Steel (P) and Stainless Steel (M).

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Ensure the machine spindle is fully stopped and the turret or tool post is locked before indexing or replacing inserts. Seat the insert fully against the pocket locating surfaces before engaging the clamp or pin; an improperly seated insert can fracture under load. Verify that the toolholder, insert pocket, and shim are free of chips and debris prior to installation.