Kyocera CNMA431/CNMA120404 KW10 Grade Uncoated Carbide Indexable Turning Insert

Product Overview

The Kyocera CNMA120404 KW10 Grade Uncoated Carbide Indexable Turning Insert is a precision-engineered cutting tool manufactured by Kyocera in Japan. provides stable cutting action with minimal burr formation, making it ideal for CNC turning centers performing external turning, facing, boring operations. The CNMA120404 features a 80° Diamond geometry with 4 usable cutting edges, engineered to deliver versatile machining capability across multiple operations. minimizes downtime and reduces cost-per-part.

ISO Designation Breakdown

Engineering Dimensions & Geometry

Grade Details - Key Grade Characteristics

KW10 is a premium uncoated fine-grain tungsten carbide grade engineered by Kyocera for general-purpose turning and multi-operation machining. The micro-grain structure (sub-micron particle size) provides an optimal balance of hardness and toughness, delivering a sharp, stable cutting edge that maintains dimensional accuracy over extended machining cycles.

• Substrate: Ultra-fine WC-Co carbide (ISO K10 equivalent classification)
• Hardness: ~91.5 HRA, providing excellent wear resistance at moderate speeds
• Coating: Uncoated (bare substrate) to preserve edge sharpness for fine finishing
• Edge Preparation: Precision-honed T-land for burr-free surface formation
• Thermal Stability: Stable performance up to 400°C without oxidation degradation
• Primary Advantage: Mirror-finish surface quality on turned faces and diameters

Grade Comparison Matrix

Chipbreaker Profile

The CNMA120404 features a flat top (no chipbreaker) geometry optimized for external turning, facing, boring. The flat top surface provides maximum edge strength for heavy roughing and interrupted cuts, while the sharp cutting edge ensures clean surface finishes on continuous cuts.

• Chipbreaker Type: N/A (Flat Top (No Chipbreaker))
• Rake Angle: Neutral to slightly negative for strength in cast iron
• Flank Relief: Standard 7° clearance for general turning
• Chip Flow: Unrestricted flow for heavy chip loads
• Edge Condition: Precision ground for sharpness and strength

Recommended Applications & Workpiece Materials

The KW10 substrate and uncoated edge make the CNMA120404 particularly effective on materials where edge sharpness and stability are critical. Recommended workpiece materials include:

• Carbon & Alloy Steels (up to 35 HRC) — Excellent surface finish and predictable tool life
• Stainless Steels (304, 316, 430 series) — Reduced work-hardening tendency due to sharp edge
• Cast Iron (Gray, Ductile) — Stable cutting with excellent wear resistance
• Non-Ferrous Metals (Aluminum, Brass, Copper) — Mirror finish achievable without built-up edge
• Titanium Alloys (Ti-6Al-4V) — Suitable for low-speed precision turning with adequate coolant

Application Map by Operation

Recommended Cutting Conditions

Note: Values are starting recommendations. Optimize based on machine rigidity, coolant delivery, and workpiece setup. For finishing operations, reduce depth of cut and feed by 30–50%.

Operating Guidelines

• Toolholder Selection: Use CNMA-compatible turning holders with precise pocket tolerances (±0.01 mm) to maintain cutting edge alignment.
• Insert Seating: Ensure the insert sits fully in the pocket without debris. Torque clamping screw to 2.5–3.0 N·m; do not overtighten.
• Coolant Recommendation: Flood coolant with 5–8% soluble oil emulsion is recommended for steel and stainless steel. For cast iron and aluminum, dry machining or minimum quantity lubrication (MQL) is acceptable.
• Depth of Cut Strategy: For roughing, use 1.5–2.0× corner radius for optimal chip formation. For finishing, reduce to 0.5–1.0× radius.
• Indexing: When flank wear exceeds 0.10 mm or surface finish degrades, index to a fresh cutting edge. Discard insert when all edges are exhausted.
• Workpiece Runout: Maintain workpiece runout below 0.02 mm to prevent uneven tool wear and chatter marks.

Toolholder Compatibility

The CNMA120404 is designed to seat in standard CNMA series turning toolholders. Compatible holder families include:

• Kyocera CNMA-E External Turning Holders (matching IC size)
• Kyocera CNMA-I Internal Boring Bars (minimum bore Ø16 mm)
• ISO 1832 Type C compliant pockets
• Clamp systems: Lever-lock or top-screw clamp depending on holder series

Verify holder pocket geometry (IC, thickness, and seat angle) matches insert specifications before mounting. Incompatible holders may cause vibration, poor surface finish, and insert fracture.

Packaging & Ordering Information

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