DNMG442CQ 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 442, and is manufactured to exacting tolerances for professional CNC turning applications.

ISO Designation Breakdown

The DNMG150608CQ designation is structured according to ISO 1832 standards, providing a complete technical fingerprint of the insert:

Engineering Dimensions & Geometry

The DNMG150608CQ 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): 1/4" — provides insert rigidity and heat capacity
• Nose Radius (r): 1/32" — 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

The CQ chipbreaker is an up-facing geometry optimized for facing and internal turning operations. Its asymmetric groove profile directs chips upward and away from the workpiece surface, preventing surface damage and ensuring clean machining.

Technical characteristics of the CQ chipbreaker:

• Chipbreaker Code: CQ
• 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 DNMG150608CQ 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

Recommended cutting parameters for the DNMG150608CQ in steel machining:

• Cutting Speed (Vc): 150–280 m/min for continuous cutting; 120–200 m/min for interrupted cutting
• Feed Rate (f): 0.15–0.40 mm/rev depending on chipbreaker geometry and depth of cut
• Depth of Cut (ap): 0.5–4.0 mm for general applications; up to 6.0 mm for heavy roughing
• Coolant: Wet cutting recommended for optimal tool life and surface finish; high-pressure coolant enhances chip evacuation

Operating Guidelines

For optimal performance with the DNMG150608CQ:

• 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

Compatible toolholder systems for DNMG150608CQ:

• External turning holders: DNMG series with 55° approach angle
• Boring bars: Minimum 1/2" IC capacity with neutral orientation
• Facing holders: Standard DNMG pocket for 55 degree diamond profile
• Specialty holders: Copy and profile turning holders accepting 442 size inserts

Ensure holder rigidity class matches application demands. For heavy roughing, select reinforced holders with enhanced clamping systems.

Packaging & Ordering Information

Inserts are packaged in anti-static blister packs with 10 units per standard pack. Individual insert identification includes ISO designation, grade, and batch code for full traceability. Custom packaging and labeling available for contract manufacturing and MRO supply chains.

Minimum Order Quantity: 1 pack (10 inserts)
MPN: TMH00172
ISO Designation: DNMG150608CQ
ANSI Code: DNMG442CQCA025P

Catalog Meta Data

Product Classification: ISO Series ISOI | Style DNMG | Size 442 | Grade CA025P | Coating CVD

Identifiers: ISO DNMG150608CQ | ANSI DNMG442CQCA025P | Manufacturer Part Number TMH00172

Availability: Standard stock item with immediate dispatch capability.