DNMG431GP CA025P Grade CVD Carbide, Indexable Turning Insert For Boring, Copying, External Turning

Product Overview

This insert is part of Kyocera's ISO ISOI series, style DNMG, size 431, and is manufactured to exacting tolerances for professional CNC turning applications.

ISO Designation Breakdown

Understanding the ISO code DNMG150404GP is essential for correct tool selection. Each segment of this designation encodes specific geometric and application parameters:

Engineering Dimensions & Geometry

The DNMG150404GP features precision-ground geometry optimized for boring, copying, external turning. Key dimensional specifications include:

• Shape: 55 Degree Diamond with 55° included angle
• Inscribed Circle (IC): 1/2" — determines holder pocket size and tool reach
• Thickness (S): 3/16" — provides insert rigidity and heat capacity
• Nose Radius (r): 1/64" — influences surface finish and edge strength
• Hand: Neutral — compatible with corresponding toolholder orientation
• Cutting Edges: Multiple usable edges per insert for cost efficiency

The geometric tolerances meet ISO 1832 Class H standards, ensuring interchangeability across qualified toolholders and consistent cutting edge positioning.

Grade Details — Key Grade Characteristics

Grade CA025P is engineered for general to interrupted machining of steel. The CVD coating architecture includes an optimized alumina layer that delivers exceptional thermal resistance and a specialized surface treatment that minimizes chip adhesion, extending tool life significantly.

Key performance characteristics of grade CA025P:

• Substrate: Fine-grained carbide with high cobalt content for toughness
• Coating Architecture: Multi-layer CVD with TiN/TiCN/Al₂O₃ layers
• Hardness: Optimized balance between hardness and fracture resistance
• Thermal Resistance: Superior oxidation resistance up to 900°C cutting temperatures
• Application Range: General to interrupted machining of carbon steel, alloy steel, and cast steel
• Post-Coating Treatment: Specialized surface finish to reduce built-up edge and adhesion

Grade Comparison Matrix

Note: Grade CA025P is positioned as a versatile, high-reliability grade for general steel machining with excellent interruption tolerance due to its thickened alumina coating and specialized post-treatment.

Chipbreaker Profile

GP general-purpose chipbreaker delivers consistent performance in varied applications. The medium-depth groove ensures stable chip formation while maintaining adequate edge strength for interrupted cuts and varying depths of cut.

Technical characteristics of the GP chipbreaker:

• Chipbreaker Code: GP
• Intended Application: Boring, Copying, External Turning
• Chip Control Range: Optimized for standard feed rates in steel
• Surface Finish Capability: Good to excellent depending on feed and speed selection
• Edge Strength: Balanced for reliability in continuous and light interrupted cuts

Recommended Applications & Workpiece Materials

The DNMG150404GP with grade CA025P is specifically recommended for the following applications and materials:

• Primary Operations: Boring, Copying, External Turning
• Workpiece Materials: Carbon steel (C45, C50), alloy steel (4140, 4340), tool steel, cast steel, and general structural steels
• Material Hardness Range: Up to 350 HB (ideal range 150–280 HB)
• Operation Type: Continuous cutting, light interrupted cutting, and high-speed finishing
• Industry Sectors: Automotive, aerospace, general engineering, energy, and metal fabrication

Application Map by Operation

Recommended Cutting Conditions

Machining parameters for DNMG150404GP:

• Cutting Speed (Vc): 160–260 m/min for carbon and alloy steels
• Feed Rate (f): 0.10–0.45 mm/rev — adjust based on required surface finish
• Depth of Cut (ap): 0.5–3.5 mm standard; up to 6.0 mm for heavy-duty holders
• Coolant: Emulsion or synthetic coolant at 6–8% concentration; minimum 3 bar pressure for chip evacuation

Operating Guidelines

For optimal performance with the DNMG150404GP:

• Ensure toolholder rigidity and minimal overhang to reduce vibration
• Use precision insert seating to maintain consistent cutting edge height
• Verify chipbreaker orientation matches cutting direction
• Monitor flank wear (VB) and replace insert when reaching 0.3 mm wear land
• Maintain coolant flow to cutting zone to prevent thermal cracking
• Store inserts in original packaging to protect cutting edges from damage

Toolholder Compatibility

The DNMG150404GP is compatible with standard ISO toolholders designed for 55 degree diamond inserts with neutral hand orientation. Recommended holder styles include:

• DNMG-type turning holders for external turning and facing
• Boring bars with 1/2" inscribed circle capacity for internal machining
• Copy turning holders with appropriate insert pocket angle (55°)
• Toolholders with precision-ground pockets and adequate clamping force

Verify holder pocket dimensions match insert thickness (3/16") and inscribed circle (1/2") for secure seating.

Packaging & Ordering Information

The DNMG150404GP is supplied in Kyocera's original industrial packaging, with each insert protected in a precision-formed plastic tray. Standard order quantity is 10 pieces per pack. OEM and bulk packaging options are available for institutional buyers. Every shipment includes material and dimensional conformance documentation.

Minimum Order Quantity: 1 pack (10 inserts)
MPN: TMH00158
ISO Designation: DNMG150404GP
ANSI Code: DNMG431GPCA025P

Catalog Meta Data

Catalog Data: Series ISOI, Style DNMG, Size 431, Grade CA025P, Coating CVD, Material Carbide, Chipbreaker GP, Hand Neutral, Type Turning

Cross-Reference: ANSI DNMG431GPCA025P, MPN TMH00158

Status: Active production item — available from stock with standard lead times.