Kennametal 5591973 CNMG643RN KCP40B Turning Insert

Product Description

The KENNAMETAL 5591973 is a solid carbide turning insert in the KENLOC series, designated by ANSI code CNMG643RN and ISO code CNMG190612RN. It features a multilayer CVD coating — TiN, TiCN, and Al2O3 — applied via MTCVD process, giving it strong wear resistance and toughness across a range of cutting conditions. The insert carries an 80-degree diamond (rhombic) shape with a neutral hand orientation and a negative rake and side clearance. With four usable cutting edges and a chamfered and honed edge style, this insert is suited for roughing and medium machining operations on steel and stainless steel workpieces. Machinists and CNC operators working in production turning environments will find this a practical workhorse insert for general turning, facing, and boring.

This insert is designed for turning, facing, and boring applications on steel (ISO P) and stainless steel (ISO M) workpieces. Its KCP40B grade provides high toughness for steel and moderate wear resistance and toughness for stainless steel, making it appropriate for a range of stock removal passes where interrupted cuts or variable surface conditions are a factor. It fits KENLOC-compatible toolholders that accept CNMG-style inserts held by clamp or pin methods. Typical applications are found in production machine shops and industrial maintenance environments where consistent, repeatable material removal is required.

Key Features

• ANSI code CNMG643RN / ISO code CNMG190612RN — dual-standard identification for global toolholder compatibility
• KCP40B grade with multilayer CVD coating (TiN / TiCN / Al2O3) for toughness on steel and stainless steel
• 80-degree diamond insert shape provides a strong cutting edge geometry for roughing and medium machining
• Four cutting edges maximize insert utilization and reduce per-edge tooling cost
• Neutral hand orientation with negative rake and negative side clearance for use in standard CNMG toolholders
• Chamfered and honed cutting edge style reduces chipping risk during entry and interrupted cuts

Compatibility

Designed for use in KENLOC-series toolholders and other compatible CNMG-style clamping systems that accept clamp or pin insert holding methods. Conforms to ANSI and ISO standards for CNMG insert geometry.

Installation Notes

Insert replacement should be performed by a qualified machinist or toolroom technician with the machine fully stopped and all moving components secured. Use the appropriate torque wrench and seating tool specified for the KENLOC clamp or pin system to avoid cracking the carbide substrate. Inspect the insert pocket and clamp for wear or debris before seating a new insert. Follow the toolholder manufacturer's clamping procedure to ensure correct edge presentation and prevent premature insert failure.