Kyocera SNMG120412 CA025P TMH00236 Turning Insert - General Turning

Product Overview

The Kyocera SNMG120412 is a premium indexable turning insert featuring the CA025P grade with a 1.2 mm corner radius and Standard chipbreaker geometry. Designed for general turning, this insert delivers exceptional performance in steel, cast iron applications. The CVD multi-layer coating ensures high wear resistance and thermal stability, making it ideal for demanding production environments where tool life and surface finish are critical.

ISO Designation Breakdown

The model code SNMG120412 follows the ISO 1832 standard for indexable inserts:

| Position | Code | Meaning | Specification | |---|---|---|---| | 1 (Shape) | S | Square | Square insert with 80° included angle | | 2 (Clearance) | N | 0° clearance | 0° clearance angle (neutral) | | 3 (Tolerance) | M | Tolerance class | Dimensional accuracy per ISO 1832 | | 4 (Hole/Type) | G | Hole + Chipbreaker | With hole & chipbreaker grooves | | 5–6 (Size) | 12 | Edge length | Inscribed circle Ø 12.0 mm | | 7–8 (Thickness) | 04 | Thickness | s = 4.76 mm | | 9–10 (Radius) | 12 | Corner radius | r = 1.2 mm | | 11–12 (Chipbreaker) | Standard | Standard chipbreaker | General purpose chipbreaker geometry |

Engineering Dimensions & Geometry

All dimensions conform to ISO 1832:2017 tolerances for Class M inserts.

| Dimension | Symbol | Value | Tolerance | Unit | |---|---|---|---|---| | Inscribed Circle Diameter | IC | 12.0 | ±0.05 | mm | | Insert Thickness | s | 4.76 | ±0.13 | mm | | Corner Radius | r | 1.2 | ±0.10 | mm | | Hole Diameter (d₁) | d₁ | 4.4 | ±0.05 | mm | | Counterbore Diameter (d₂) | d₂ | 8.0 | ±0.10 | mm | | Insert Shape Angle | — | 80° | ±1° | deg | | Clearance Angle | α | 0° | ±0.5° | deg | | Thickness Tolerance Class | — | M | Per ISO 1832 | — | | Edge Length (L) | L | 12 | ±0.10 | mm | | Nominal Size | — | 12 | Standard | ISO |

Grade Details — Key Grade Characteristics

The CA025P grade is a PVD/CVD hybrid-coated cemented carbide optimized for steel and stainless steel machining. It combines a tough substrate with a thermally stable multi-layer coating to deliver balanced wear resistance and edge strength.

| Characteristic | Specification | Test Standard | |---|---|---| | Substrate Material | WC-Co Cemented Carbide | ISO 3369 | | Coating System | TiCN (base) + Al₂O₃ (middle) + TiN (top) | SEM/EDS | | Coating Thickness | 8–12 μm total | Calotest | | Coating Hardness | HV 0.05 3,000 | Vickers | | Oxidation Temperature | 1,050 °C | TGA | | Thermal Conductivity | 35–45 W/m·K | Laser Flash | | Coefficient of Friction | 0.35–0.45 (vs. steel) | Pin-on-Disc | | Surface Roughness (Ra) | 0.15–0.30 μm | Profilometer |

Grade Comparison Matrix

Select the optimal grade for your application by comparing key performance attributes:

| Grade | Coating | ISO Range | Best For | Speed Capability | Wear Resistance | Toughness | |---|---|---|---|---|---|---| | CA025P | CVD Multi-layer | P10–P30 / M10–M20 | Steel, SS, Cast Iron | High | Excellent | Very Good | | CA015P | CVD Thin | P05–P20 | High-speed finishing | Very High | Good | Good | | CA035M | CVD + PVD | M20–M40 | Stainless, Tough Steel | Medium | Good | Excellent | | PR1535 | PVD | P10–P25 | General machining | High | Very Good | Good | | PR1725 | PVD | M15–M30 | Interrupted cuts | Medium | Good | Excellent |

Chipbreaker Profile

**Standard Chipbreaker Profile**The Standard chipbreaker is engineered with a standard-duty geometry featuring a precisely ground rake angle and groove depth optimized for general turning.| Profile Parameter | Value | Function | |---|---|---| | Rake Angle (γ) | 8°–12° | Reduces cutting force, improves chip flow | | Groove Width | 0.8–1.6 mm | Controls chip curl and breaking | | Groove Depth | 0.15–0.35 mm | Determines chip thickness capacity | | Land Width | 0.10–0.25 mm | Strengthens cutting edge | | Back Relief | 6°–8° | Reduces flank wear | | Nose Radius | 1.2 mm | Defines surface finish capability |

Recommended Applications & Workpiece Materials

The Standard chipbreaker paired with CA025P is specifically recommended for the following materials and operations:

• Carbon Steels: C15–C45, normalized or annealed — excellent for continuous and light interrupted cuts
• Alloy Steels: 4140, 4340, 8620 (quenched & tempered up to 35 HRC) — high wear resistance at elevated speeds
• Stainless Steels: 304, 316, 420 — reduced built-up edge thanks to coating lubricity
• Cast Irons: Gray cast iron (GG25) and ductile iron (GGG40) — stable performance in both dry and wet conditions
• Tool Steels: Pre-hardened H13, D2 (up to 45 HRC) — requires reduced speeds for optimal life

Application Map by Operation

Match the insert to your specific turning operation for best results:

| Operation | Suitability | Recommended DOC | Feed Rate | Surface Finish | |---|---|---|---|---| | Finish Turning | ☆☆☆☆☆ | Not recommended | — | — | | Semi-Finish | ★★☆☆☆ | 3.00–5.00 mm | 0.40–0.60 mm/rev | Rough (Ra 6.3–12.5) | | Roughing | ★★★★☆ | 5.00–10.00 mm | 0.60–1.00 mm/rev | Very Rough (Ra 12.5+) | | Heavy Roughing | ★★★★★ | 8.00–15.00 mm | 0.80–1.50 mm/rev | Very Rough (Ra 12.5+) | | Interrupted Cuts | ★★★★★ | 4.00–10.00 mm | 0.50–1.20 mm/rev | Rough (Ra 6.3–12.5) |

Recommended Cutting Conditions

Start with the following parameters and optimize based on machine rigidity and workpiece condition:

| Parameter | Recommended Range | Optimal Value | Notes | |---|---|---|---| | Cutting Speed (Vc) | 120–250 m/min | 180 m/min | Adjust for workpiece hardness | | Feed Rate (f) | 0.10–0.50 mm/rev | Mid-range | Higher feed for roughing | | Depth of Cut (ap) | 0.50–3.00 mm | Mid-range | Reduce for finishing | | Coolant | Wet / Dry | Wet preferred | High-pressure coolant extends life | | Insert Position | Neutral | 0° inclination | Use negative rake for roughing |

Operating Guidelines

Follow these best practices to maximize insert life and machining quality:

| Guideline | Recommendation | Rationale | |---|---|---| | Tool Overhang | Minimize to < 4× insert size | Reduces vibration and chatter | | Insert Seat Condition | Clean before seating | Ensures accurate positioning | | Torque Setting | 3.5–4.5 Nm (lever lock) | Prevents insert movement / fracture | | Coolant Pressure | 20–70 bar for high-pressure | Improves chip evacuation | | Chip Control | Use chipbreaker matching feed | Prevents bird-nesting | | First Cut | Reduce speed by 20% for 1st pass | Validates setup stability | | Tool Life Check | Inspect every 15 min initially | Establish baseline for batch | | Edge Preparation | As-supplied ( honed 0.02–0.05 mm) | Do not re-sharpen |

Toolholder Compatibility

Ensure correct toolholder selection for secure clamping and accurate positioning:

| Insert Shape | Compatible Toolholder Series | Holder Type | Clamp Style | Max Depth (mm) | |---|---|---|---|---| | SNMG / SNMM | MCLNR / MCLNL | 95° External Turning | Lever Lock | 25 | | SNMG / SNMM | MCKNR / MCKNL | 75° External Turning | Lever Lock | 25 | | SNMG / SNMM | SCLCR / SCLCL | 95° Boring Bar | Screw Clamp | 20 | | SNMG / SNMM | PCLNR / PCLNL | 80° External Turning | Pin Lock | 30 | | SNMG / SNMM | DCLNR / DCLNL | 55° External Turning | Lever Lock | 20 |

Packaging & Ordering Information

All inserts are supplied in original Kyocera packaging with full traceability:

| Packaging Type | Quantity | Labeling | Storage | |---|---|---|---| | Sealed Plastic Box | 10 inserts/box | Laser-marked with Grade, ISO Code, Batch No. | Dry, room temperature | | Industrial Bulk Pack | 50 inserts/carton | Barcode + QR traceability | Climate-controlled warehouse | | Individual Blister | 1 insert/pack | Full specification print | Retail display ready |

MPN: TMH00236 | Price: $7.1 per insert | Minimum Order: 10 units

Catalog Meta Data

Technical and administrative metadata for procurement and inventory systems:

| Attribute | Value | |---|---| | Catalog Series | Kyocera CA Series | | Product Family | Indexable Turning Inserts | | Industry Standard | ISO 1832 | | Certification | ISO 9001:2015, ISO 14001:2015 | | Traceability | Full batch tracking via QR code | | Warranty | 12 months from date of manufacture | | Country of Origin | Japan |