Kyocera CNMM434PX CA025P TMH00136 Turning Insert - Boring
- Stock: In Stock
- Model: CNMM
- Weight: 0.10kg
- Manufactured: In Japan
- Ships: Worldwide
- Item Code: TMH00136
CNMM434PX CA025P Grade CVD Carbide, Indexable Turning Insert For Boring, External Turning, Facing, Internal Facing
Product Overview
The CNMM120416PX is a premium-grade rhombic 80° insert from Kyocera Precision Tools, manufactured in Japan to exacting ISO standards. Featuring the advanced CA025P CVD multi-layer coating and the PX chipbreaker geometry, this insert is engineered for boring, external turning, facing, internal facing operations on steel workpieces. With 2 usable cutting edges, it delivers exceptional cost-per-edge efficiency while maintaining consistent dimensional accuracy and surface finish across high-volume production runs.
ISO Designation Breakdown
The complete ISO designation CNMM120416PX encodes critical dimensional and geometric data:
| ISO Designation Element | Value | Meaning |
|---|---|---|
| Shape | C | 80 Degree Diamond |
| Clearance | N | N (0° clearance) |
| Tolerance Class | M | ±0.005" inscribed circle, ±0.001" thickness |
| Hole / Fixing | G | With cylindrical hole and countersink |
| Size | 434 | 1/2" inscribed circle, 3/16" thickness |
| Corner Radius | 1/16" | Nose radius for edge strength and finish |
| Chipbreaker | PX | The PX chipbreaker geometry is optimized for reliable chip control and stable cutting performance across a range of machining parameters |
Engineering Dimensions & Geometry
| Dimensions & Geometry | |
|---|---|
| Inscribed Circle (IC) | 1/2" |
| Insert Thickness (S) | 3/16" |
| Nose Radius (rε) | 1/16" |
| Included Angle | 80° |
| Clearance Angle | 0° (N-type, neutral hand) |
| Cutting Edges | 2 |
| Hand | Neutral |
Grade Details – Key Grade Characteristics
The CA025P grade represents Kyocera's advanced CVD-coated carbide technology, specifically formulated for steel machining:
- Substrate: Ultra-fine grain tungsten carbide with high cobalt content for superior toughness and crack resistance.
- Coating Architecture: Multi-layer CVD coating featuring a thick alumina (Al₂O₃) top layer—twice the thickness of conventional coatings—providing exceptional thermal barrier properties and oxidation resistance at elevated cutting temperatures.
- Post-Coating Treatment: Specialized surface smoothing process eliminates coating droplets and micro-defects, significantly reducing built-up edge (BUE) and improving chip flow.
- Thermal Performance: The thickened alumina layer maintains coating integrity at cutting edge temperatures exceeding 800°C, enabling higher cutting speeds without premature flank wear.
- Application Range: Ideal for general turning through interrupted cutting of carbon steel, alloy steel, and bearing steel (ISO P10–P30 range).
Grade Comparison Matrix
Select the optimal grade for your specific machining environment:
| Grade | Coating | Primary Use | Best For |
|---|---|---|---|
| CA025P | CVD Multi-Layer | General to Interrupted Steel | High-speed finishing, reliable tool life |
| CA530 | CVD Thick Coat | Heavy-Duty Roughing | Maximum edge strength, deep cuts |
| PR1535 | PVD | Stainless Steel | Corrosion-resistant materials |
| PV720 | PVD | Hardened Steel >45 HRC | Hard turning, dimensional stability |
Chipbreaker Profile
The PX chipbreaker geometry is optimized for reliable chip control and stable cutting performance across a range of machining parameters.
Key Benefits:
- Controlled chip curl radius prevents bird-nesting and protects finished surfaces
- Optimized rake angle reduces cutting force by up to 15% compared to standard geometries
- Reinforced cutting edge land improves micro-chipping resistance in scale-covered or forged surfaces
- Compatible with both dry machining and emulsion coolant systems
Recommended Applications & Workpiece Materials
The CNMM120416PX with CA025P grade is specifically recommended for the following material groups:
- Carbon Steels: C35, C45, C60 (ISO 1.0503, 1.0501, 1.0601) – Excellent balance of wear resistance and edge toughness
- Alloy Steels: 4140, 4340, 42CrMo4 (ISO 1.7225) – Stable performance in normalized and quenched conditions
- Bearing Steels: 100Cr6, 52100 – Reliable finishing with minimal white-layer formation
- Tool Steels: O1, D2 (annealed condition) – Cost-effective alternative to grinding for rough shaping
- Cast Steels: GS-45, GS-60 – Effective scale cutting with reduced edge chipping
Application Map by Operation
| Operation | Suitability | Notes |
|---|---|---|
| External Turning | ★★★★★ Excellent | Primary application; use recommended parameters |
| Facing | ★★★★★ Excellent | Maintain constant surface speed at center approach |
| Boring | ★★★★☆ Very Good | Ensure holder overhang <4× diameter for stability |
| Chamfering | ★★★★☆ Very Good | Reduce feed by 30% for crisp edge definition |
| Copying / Contouring | ★★★★☆ Very Good | Use constant surface speed (CSS) mode on CNC lathes |
| Undercutting | ★★★☆☆ Good | Verify holder clearance angle to avoid rubbing |
| Internal Facing | ★★★★☆ Very Good | Use rigid boring bar with minimum overhang |
Recommended Cutting Conditions
Starting parameters for continuous turning of carbon steel (C45 / 1.0501) with emulsion coolant:
| Parameter | Range | Recommended | Unit |
|---|---|---|---|
| Cutting Speed (Vc) | 120 – 220 | 170 | m/min |
| Feed Rate (f) | 0.25 – 0.60 | 0.42 | mm/rev |
| Depth of Cut (ap) | 2.0 – 8.0 | 5.0 | mm |
Note: Aggressive parameters for heavy roughing and high-material-removal applications. Adjust values based on machine rigidity, workpiece condition, and coolant delivery. Reduce speed by 20% for interrupted cuts.
Operating Guidelines
- Insert Seating: Clean the toolholder pocket thoroughly before insert installation. Even microscopic debris can cause uneven load distribution and premature fracture.
- Clamping Torque: Tighten clamping elements to the specified torque. Over-tightening deforms the insert seat; under-tightening allows micro-movement and edge chipping.
- Coolant Delivery: Direct coolant to the cutting zone at 8–12 bar pressure for optimal chip evacuation and thermal management. For CA025P, high-pressure coolant extends tool life by up to 25%.
- Edge Inspection: Index the insert when flank wear (VB) reaches 0.3 mm or when surface finish degrades beyond specification. Do not wait for catastrophic failure.
- Storage: Store inserts in original packaging at 15–25°C with humidity below 60%. Avoid contact with corrosive chemicals or excessive vibration.
- Safety: Always wear cut-resistant gloves when handling indexable inserts. Used edges are razor-sharp and can cause serious lacerations.
Toolholder Compatibility
The CNMM120416PX rhombic 80° insert is designed for use with the following ISO-standard toolholder families:
- MCMNN, MCLNR/L, DCLNR/L – Primary external turning and facing holders
- Screw-clamp holders – Recommended for secure insert retention and quick indexing
- Lever-lock holders – Alternative for high-pressure coolant applications
Ensure holder seat angle matches the insert clearance (N (0° clearance)) and that the pocket is free of debris before seating. Use a torque wrench to tighten clamping screws to manufacturer specifications (typically 2.5–3.5 N·m).
Packaging & Ordering Information
| Packaging Type | Individual plastic insert box (10 inserts per pack) |
| Minimum Order Quantity | 10 inserts (1 pack) |
| MPN / Catalog No. | TMH00136 |
| Unit Price | $7.19 |
| Stock Status | In Stock – Ready for dispatch |
Catalog Meta Data
| Product Category | Indexable Turning Inserts – Turning |
| Catalog Series | ISO Standard – CNMM Series |
| Grade Family | CA-Series CVD Coated Carbide |
| Revision Date | 2026-Q2 |
| Data Sheet | Available upon request – includes full cutting parameter tables and application charts |
