CNMG433GS CA025P Grade CVD Carbide, Indexable Turning Insert For Boring, External Turning, Facing, Internal Facing

Product Overview

The CNMG433GS is a carbide-based indexable turning insert manufactured by Kyocera Precision Tools in Japan. Featuring Grade CA025P with CVD coating, this 80 degree diamond insert is engineered for boring, external turning, facing, internal facing operations. The CNMG433GS delivers superior surface finish, enhanced wear resistance, and excellent thermal stability in demanding CNC machining environments.

With 4 usable cutting edges, this insert maximizes cost-per-edge efficiency while maintaining consistent dimensional accuracy across high-volume production runs. The optimized substrate and coating combination ensures reliable performance in hard material machining applications.

ISO Designation Breakdown

Engineering Dimensions & Geometry

Grade Details – Key Grade Characteristics

Grade CA025P is a CVD-coated carbide composite specifically developed for machining hardened materials and cast iron at elevated cutting speeds. The grade combines aluminum oxide (Al₂O₃) and titanium carbide (TiC) in a thermally stable matrix, finished with a titanium nitride (TiN) PVD coating for enhanced wear recognition and reduced built-up edge formation.

• Substrate: Al₂O₃ + TiC ceramic composite with excellent thermal shock resistance
• Coating: TiN PVD multilayer for improved wear visibility and crater resistance
• Hardness: ~1800 HV, suitable for materials up to 65 HRC
• Operating Temperature: Up to 1200°C in the cutting zone
• Primary Advantage: Enhanced flank wear resistance in continuous cutting
• Edge Preparation: Precision-honed T-land for edge strength and finish quality

Grade Comparison Matrix

Chipbreaker Profile

The CNMG433GS features the Standard geometry. This chipbreaker design incorporates a precisely engineered groove and land configuration that optimizes chip formation and evacuation across the recommended feed range.

• Chip Control: Curved groove design directs chips away from the cutting zone and workpiece surface
• Feed Range: Optimized for 0.1-0.3 mm/rev feed rates
• Depth of Cut: Effective chip control up to 2.0 mm depth of cut
• Chip Form: Produces short, manageable 6-shaped or C-shaped chips in steels
• Surface Finish: Polished rake face reduces built-up edge and improves surface quality
• Edge Line: Smooth transition from rake face to flank minimizes stress concentration

Recommended Applications & Workpiece Materials

This insert is specifically recommended for the following material groups and hardness ranges:

Note: For optimal performance in hardened steels above 55 HRC, use the lower end of the recommended cutting speed range with continuous coolant application or dry cutting depending on machine capability.

Application Map by Operation

Recommended Cutting Conditions

Operating Guidelines

• Rigidity: Ensure maximum machine and workpiece rigidity. Minimize overhang and use tailstock support for slender workpieces.
• Edge Preparation: Inspect insert seating pocket for debris before indexing. Use a torque wrench for clamping screws to manufacturer specifications.
• Entry/Exit: Avoid interrupted cuts where possible. If unavoidable, reduce cutting speed by 30% to prevent thermal cracking.
• Coolant Strategy: Ceramic inserts perform best under dry cutting or minimum quantity lubrication (MQL). Flood coolant can induce thermal shock leading to premature insert fracture.
• Tool Overhang: Keep toolholder overhang to less than 1.5× the holder diameter to minimize vibration and chatter.
• Insert Indexing: Rotate to a fresh edge when flank wear reaches 0.3 mm or when surface finish begins to degrade.
• Workpiece Preparation: For hardened materials, ensure the surface is free from scale, decarburization, and prior machining defects.

Toolholder Compatibility

The CNMG433GS (CNMG120412GS) is compatible with standard ISO toolholders designed for 80 degree diamond inserts with 1/2" inscribed circle and 3/16" thickness. Recommended toolholder families include:

• Primary Holders: CCLNR, CCLNL, CCMNN series toolholders
• Clamping System: Lever-lock or screw-clamp mechanisms with precision V-seating
• Holder Material: Alloy steel body with hardened steel insert pocket (45-50 HRC)
• Coolant Through: Select holders with internal coolant channels for MQL applications
• Approach Angle: Match holder approach angle to insert included angle (80°) for optimal cutting geometry

Packaging & Ordering Information

Catalog Meta Data

Genuine Kyocera Product: This insert is an authentic Kyocera Precision Tools product backed by full manufacturer warranty. For technical support, application engineering, or volume pricing inquiries, contact our CNC tooling specialists.