DCMT070204GP CA025P TMH00425

Product Overview

The DCMT070204GP CA025P TMH00425 is a precision-engineered indexable carbide insert manufactured by Kyocera in Japan. Designed for general purpose operations, this positive-relief insert delivers exceptional surface integrity, dimensional accuracy, and extended tool life in CNC turning centers and milling machines. The DCMT070204GP features general-purpose chipbreaker with open groove geometry for versatile machining. balanced rake and land width accommodate a wide range of feeds and depths in mixed production..

Suitable for steel, cast iron, this insert combines a robust carbide substrate with an advanced PVD coating to withstand high cutting temperatures and mechanical stresses. The 0.4 mm nose radius provides maximum edge sharpness for fine detail work, making it the preferred choice for precision manufacturing across aerospace, automotive, energy, and general engineering sectors.

ISO Designation Breakdown

The DCMT070204GP designation follows ISO 1832:2004 standard for indexable inserts. Each code element defines a critical geometric or application characteristic:

Engineering Dimensions & Geometry

Grade Details — Key Grade Characteristics

CA025P is a PVD-coated carbide grade from Kyocera's advanced turning portfolio, specifically engineered for steel and stainless steel machining. The substrate combines medium-grain tungsten carbide with a cobalt binder optimized for toughness and wear resistance.

• Coating: Multi-layer PVD TiAlN coating with nano-structured architecture providing thermal barrier properties up to 900°C
• Substrate: Medium-grain WC-Co with 10% cobalt content for optimal hardness-to-toughness ratio (HV 1,550)
• Color: Bronze-copper finish characteristic of TiAlN-based coatings
• ISO Application: P15–P35 (steel), M15–M25 (stainless steel)
• Cutting Speed Range: 150–350 m/min for steels, 100–250 m/min for stainless steels
• Primary Advantage: Exceptional crater wear resistance and built-up edge suppression in continuous cutting

Grade Comparison Matrix

Note: CA025P sits in the versatile middle range—offering better heat resistance than uncoated grades and superior toughness compared to ultra-hard finishing grades. Ideal for job shops requiring one grade across multiple steel applications.

Chipbreaker Profile

GP Chipbreaker — General Purpose Geometry

General-purpose chipbreaker with open groove geometry for versatile machining. Balanced rake and land width accommodate a wide range of feeds and depths in mixed production.

• Land Width: 0.15–0.25 mm (standard land)
• Rake Angle: +5° to +8° (moderate positive)
• Chip Groove Depth: Medium (0.25 mm) for balanced chip flow
• Edge Preparation: Slight hone (0.02–0.03 mm) for sharpness
• Chip Control Range: Optimal for f = 0.10–0.40 mm/rev

Recommended Applications & Workpiece Materials

The DCMT070204GP with grade CA025P is optimized for the following material groups and machining scenarios:

• Carbon Steels: C35, C45, C60 (1.0503, 1.1191) — excellent performance in normalized and quenched conditions
• Alloy Steels: 42CrMo4, 34CrNiMo6, 16MnCr5 — stable cutting across hardened and tempered states up to 40 HRC
• Stainless Steels: 304 (1.4301), 316 (1.4401), 321 (1.4541) — reduced built-up edge tendency due to coating lubricity
• Tool Steels: H13, D2, O1 — limited application in annealed condition; not recommended for >45 HRC
• Cast Irons: GJL-250 (GG25), GJS-500 (GGG50) — acceptable for grey and ductile iron in medium-speed range
• Free-Machining Steels: 11SMn30 (1.0715), 11SMnPb30 — superior chip breaking and extended tool life

Application Map by Operation

Recommended Cutting Conditions

Parameters are starting recommendations for stable setups with rigid workpieces and short overhangs. Adjust based on machine power, fixture stability, and surface finish requirements.

Operating Guidelines

• Toolholder Selection: Use positive toolholders with 7° relief (e.g., SDJCR/L07–M) and ensure insert seat is clean and undamaged
• Clamping Torque: Tighten lever or screw to manufacturer specification (typically 3.0–4.5 N·m); over-tightening causes micro-cracking
• Coolant Recommendation: Flood coolant at 6–8% concentration for steels; high-pressure coolant (70+ bar) improves chip evacuation in stainless steel
• Entry Strategy: Avoid plunging directly into solid material; use ramp entry or pre-drill center for face turning
• Tool Life Monitoring: Monitor flank wear (VB max 0.3 mm) and crater wear (KT max 0.2 mm); replace insert before catastrophic failure
• Surface Finish Tip: For best finish, use highest possible speed within range and lowest feed consistent with chip breaking; wiper inserts permit 1.5×–2× standard feed rates
• Vibration Control: If chatter occurs, reduce speed 10% and increase feed 15%; verify tool overhang <4× holder diameter

Toolholder Compatibility

The DCMT070204GP is a positive insert (7° relief) and requires compatible positive toolholders. Recommended Kyocera and industry-standard holders:

• Kyocera SDJCR/L07–M: Standard external turning holder, 93° entering angle, for 07 size inserts
• Kyocera SDJCR/L07–M: Standard holder for positive inserts with through-coolant option
• Kyocera PDJNR/L07: Lever-lock holder for high rigidity and quick insert change
• ISO Reference: DIN 4981 / ISO 5608 compliant holders with M-class insert seat tolerance
• Shank Size: Match holder shank to machine turret (16×16, 20×20, 25×25 mm); larger shanks improve stability
• Handedness: R = right-hand (standard), L = left-hand; verify against machine spindle rotation and part geometry

Packaging & Ordering Information

• Standard Pack Quantity: 10 inserts per sealed plastic container (industry standard)
• Labeling: Each insert laser-marked with Kyocera logo, grade CA025P, and batch traceability code
• MPN: TMH00425 (Kyocera global catalog number)
• Storage: Store in original packaging at 15–25°C, humidity <60% to preserve coating integrity
• Minimum Order: 1 pack (10 inserts); bulk pricing available for 50+ packs

Catalog Meta Data

• Product Series: Kyocera DCMT Positive Insert Series — Grade CA025P
• Catalog Page Reference: Kyocera General Catalog Vol. 2026, Turning Inserts Section E
• Replacement For: Compatible with all ISO-standard DCMT holders (SDJCR/L, PDJNR/L series)
• Cross-Reference: Comparable to Sandvik Coromant DCMT CA series, Iscar DCMT-IP series, Mitsubishi DCMT-MA series
• Update Cycle: Grade formulation last updated Q1 2025; coating process enhanced for 2026 production batch