Kyocera TNMG220412PS CA025P TMH00279 CNC Insert - Finishing
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- Stock: In Stock
- Model: CA025P
- Weight: 0.10kg
- Manufactured: In Japan
- Ships: Worldwide
- Item Code: TMH00279
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Product Overview
The TNMG220412PS from Kyocera is a premium cermet indexable insert engineered for high-performance CNC turning operations. Featuring the advanced CA025P grade with a Precision Finishing Chipbreaker, this insert delivers exceptional surface finish quality, extended tool life, and reliable chip evacuation across a wide spectrum of steel workpiece materials. The 12.7mm (1/2") inscribed circle and 1.2mm corner radius provide optimal balance between edge strength and surface integrity, making it the ideal choice for precision finishing, light machining.
ISO Designation Breakdown
Complete decoding of the TNMG220412PS ISO 1832 designation:
| Position | Code | Meaning |
|---|---|---|
| 1 | T | Triangular insert shape (60° included angle) |
| 2 | N | 0° clearance angle (negative rake) |
| 3 | M | ±0.05 mm tolerance class (m-class) |
| 4 | G | Cylindrical hole with 40°–60° countersink |
| 5 | 22 | Inscribed circle 12.7mm (1/2") |
| 6 | 04 | Insert thickness 4.76mm (3/16") |
| 7 | 12 | Corner radius 1.2mm |
| 8 | PS | PS – Precision Finishing Chipbreaker |
Engineering Dimensions & Geometry
- Insert Shape: Triangular (60° included angle)
- Inscribed Circle (IC): 12.7mm (1/2")
- Insert Thickness (S): 4.76mm (3/16")
- Corner Radius (rε): 1.2mm
- Hole Diameter: 6.35mm
- Countersink Angle: 40°–60° (G-type)
- Nose Angle Tolerance: ±0.05 mm (M-class)
- Thickness Tolerance: ±0.13 mm
Grade Details – Key Grade Characteristics
- Grade Name: CA025P
- Substrate Type: Cermet (TiCN-based)
- Coating System: PVD Multi-layer (TiCN + Al₂O₃)
- Hardness: HRA 92.5
- Transverse Rupture Strength: 2,200 MPa
- Visual Identification: Gold-Bronze coating
- Primary Application: High-speed finishing of steels and stainless steels
- Machinability Index: Excellent surface finish at elevated cutting speeds
Grade Comparison Matrix
Comparative overview of CA025P against adjacent grades in the Kyocera portfolio:
| Grade | Substrate | Coating | Best For |
|---|---|---|---|
| CA025P | Cermet (TiCN-based) | PVD Multi-layer (TiCN + Al₂O₃) | High-speed finishing, steels |
| CA025 | Cermet | PVD TiCN | General steel turning |
| PV720 | Carbide | CVD TiAlN | Heavy roughing, cast iron |
| PR1535 | Cermet | PVD AlCrN | Stainless steel finishing |
Chipbreaker Profile
PS – Precision Finishing Chipbreaker
Precision-ground chipbreaker designed for high-speed finishing operations. Excellent surface finish and minimal burr formation.
- Chip Groove Geometry: Narrow groove, 0.08–0.15 mm land width
- Effective Rake Angle: Positive 18° effective rake
- Chip Control Range: Precision finishing, light machining
Recommended Applications & Workpiece Materials
- Carbon Steel: C15–C60 (ISO P1.1–P3.2) – Excellent
- Alloy Steel: 4140, 4340, 8620 (ISO P4.0–P5.0) – Very Good
- Stainless Steel: 304, 316, 420 (ISO M1.0–M3.0) – Good to Very Good
- Tool Steel: H13, D2, O1 (ISO P6.0–P7.0) – Good
- Free-Machining Steel: 1215, 12L14 (ISO P1.3–P2.0) – Excellent
- Bearing Steel: 52100 (ISO P5.0) – Good
Application Map by Operation
Visual suitability matrix for TNMG220412PS across common turning operations:
| Operation Type | Suitability |
|---|---|
| Roughing | ★☆☆☆☆ Not Recommended |
| Semi-Roughing | ★★☆☆☆ Fair |
| Semi-Finishing | ★★★★☆ Very Good |
| Finishing | ★★★★★ Excellent |
| Precision / Mirror | ★★★★☆ Very Good |
Recommended Cutting Conditions
Optimized parameters for CA025P grade when machining plain carbon and alloy steels (dry or MQL lubrication):
| Parameter | Recommended Range | Unit |
|---|---|---|
| Cutting Speed (Vc) | 260–455 | m/min |
| Feed Rate (fn) | 0.05–0.20 | mm/rev |
| Depth of Cut (ap) | 0.1–1.5 | mm |
Note: Values are starting recommendations. Adjust based on machine rigidity, workpiece condition, and desired surface finish. Reduce Vc by 15–20% for interrupted cuts or hardened materials.
Operating Guidelines
- Always verify toolholder seat cleanliness before insert indexing to prevent micro-chipping.
- Use minimum quantity lubrication (MQL) or dry cutting for optimal cermet performance; avoid flood coolant with high thermal shock.
- Maintain consistent feed rates to prevent built-up edge (BUE) formation on low-carbon steels.
- For finishing operations, reduce depth of cut to <0.5 mm and increase cutting speed to upper range for mirror surfaces.
- Index the insert after visible flank wear (VB) reaches 0.15 mm to protect the toolholder seat.
- Store unused inserts in original packaging away from direct sunlight and moisture.
Toolholder Compatibility
The TNMG220412PS is designed for standard TNMG toolholders with negative rake seats. Compatible holder families include:
- External Turning: MTJNR/L 22-5D, STGCR/L 22-4C, WTJNR/L 22-6D
- Internal Boring: S22S-SCLCR/L, A22S-MCLNR/L
- Clamp Type: Lever-lock or top-clamp (depending on holder design)
- Seat Angle: 0° (negative rake) – do not use in positive rake holders
Packaging & Ordering Information
Each insert is individually packaged in anti-static blister packs with foam cushioning to prevent edge damage during transit. Standard pack quantity: 10 inserts per box. MPN: TMH00279. Batch traceability code laser-marked on every insert. Store in original packaging at 15–25°C, humidity <60% RH. For bulk orders, contact our technical sales team for volume pricing and lead-time confirmation.
Catalog Meta Data
Catalog Series: TNMG-22 Cermet Line
Revision: Rev. 2026-011
ECCN: 1C003.b
HS Code: 8209.00.00
RoHS Status: Compliant
REACH Status: Compliant
Conflict Mineral Free: Certified
Country of Manufacture: Japan
Quality Standard: ISO 9001:2015, ISO 14001:2015
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