Mitsubishi CNMG120408 UC5115 CVD Carbide Turning Insert for Cast Iron (10pcs)
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Mitsubishi CNMG120408 (CNMG432) UC5115 Cast Iron Turning Carbide Inserts (10 Pcs/Box)
Heavy-Duty 80° Diamond Turning Inserts | ISO CNMG120408 / ANSI CNMG432 | Dedicated UC5115 CVD Grade for Gray & Ductile Iron
1. Product Overview
Which carbide turning insert grade is most effective for high-speed, heavy-interrupted turning on gray cast iron and ductile iron without premature flank wear or thermal cracking?
The Mitsubishi CNMG120408 (ANSI equivalent CNMG432) UC5115 is an industrial-grade, 80-degree diamond negative turning insert engineered specifically for high-efficiency turning of ISO K workpiece materials (cast iron). Supplied in a standard factory plastic box of 10 pieces, this insert features Mitsubishi's proprietary UC5115 CVD (Chemical Vapor Deposition) multi-layer coating grade, combining a thick Al2O3 (aluminum oxide) layer with a tough TiCN sub-layer on an ultra-dense carbide substrate. Designed with robust double-sided cutting edges and precision chipbreaker geometry, the CNMG120408 UC5115 excels in high-speed continuous to heavily interrupted machining operations across gray iron (FC), ductile/nodular iron (FCD), and chilled cast iron castings.
ISO / ANSI Tool Designation Code Breakdown
(80° Diamond)
(0° Negative)
(Precision Class M)
(Double-Sided Pin)
(12.7mm / 1/2" IC)
(4.76mm / 3/16")
(0.8mm / 1/32")
(CVD Cast Iron)
- C (ISO/ANSI): 80-degree rhombic / diamond shape providing maximum edge strength for heavy outer diameter turning and facing.
- N (ISO/ANSI): 0-degree negative clearance angle, enabling reversible 4-corner double-sided cutting edges (4 usable corners).
- M (ISO/ANSI): Industry standard dimensional tolerance class for economic high-volume lathe production.
- G (ISO/ANSI): Cylindrical center pin hole with molded chipbreaker geometries on top and bottom faces.
- 120408 (Metric ISO): 12.9mm edge length (1/2" IC), 4.76mm thickness, 0.8mm nose radius.
- 432 (Imperial ANSI): 4/8" (1/2") Inscribed Circle, 3/16" thickness, 2/64" (1/32") corner radius.
- UC5115: Mitsubishi premium CVD Al2O3 + TiCN coated grade dedicated for ISO K cast iron turning applications.
2. Key Features
- Mitsubishi UC5115 Cast Iron Grade: Formulated with a thick, smooth Al2O3 layer that acts as a thermal barrier, dramatically reducing flank wear and crater wear during high-speed iron dry or wet turning.
- Double-Sided 4 Cutting Edges: Reversible negative rake layout delivers 4 fully usable cutting corners per insert for maximum cost efficiency.
- Substrate Toughness: High-density carbide matrix eliminates catastrophic edge chipping during interrupted cuts on cast iron skins, scale, and casting blowholes.
- Precision Edge Honing: Optimized edge land hone stabilizes cutting forces, prevents micro-flaking, and maintains tight dimensional tolerances across long production batches.
- 10 Inserts Per Box: Genuine factory sealed box packaging (10 pcs) with barcode batch tracking.
3. Technical Specifications & Recommended Parameters
Metric (ISO) vs. Imperial (ANSI) Specification Comparison
| Specification Unit | ISO Metric Code (CNMG120408) | ANSI Imperial Code (CNMG432) |
|---|---|---|
| Inscribed Circle (IC) | 12.7 mm | 0.500 in (1/2") |
| Thickness (S) | 4.76 mm | 0.187 in (3/16") |
| Hole Diameter (D1) | 5.16 mm | 0.203 in |
| Nose Radius (RE) | 0.8 mm | 0.031 in (1/32") |
| Included Angle & Relief | 80° Rhombic / 0° Negative | 80° Diamond / 0° Negative |
Recommended Cast Iron Turning Parameters for UC5115
| ISO Material Group | Workpiece Type | Cutting Speed Vc (m/min / SFM) | Feed Rate fn (mm/rev / IPR) | Depth of Cut ap (mm / in) |
|---|---|---|---|---|
| ISO K10 - K20 | Gray Cast Iron (FC150, FC250, FC300) | 200 - 450 m/min (650 - 1480 SFM) | 0.15 - 0.45 mm/r (0.006 - 0.018 IPR) | 0.8 - 4.5 mm (0.031 - 0.177 in) |
| ISO K20 - K30 | Ductile / Nodular Iron (FCD450, FCD600) | 150 - 350 m/min (490 - 1150 SFM) | 0.15 - 0.40 mm/r (0.006 - 0.016 IPR) | 0.8 - 4.0 mm (0.031 - 0.157 in) |
| ISO K30 - K35 | Heavy Interrupted Cast Iron Turning | 120 - 280 m/min (390 - 920 SFM) | 0.20 - 0.35 mm/r (0.008 - 0.014 IPR) | 1.0 - 3.5 mm (0.039 - 0.138 in) |
Mount these CNMG120408 (CNMG432) inserts into standard lever-lock or rigid clamp OD / Boring toolholders (PCLNR/L, MCLNR/L, PCLCR/L):
View Compatible PCLNR & MCLNR Toolholders →4. Product Applications
- Automotive Castings: Turning brake drums, brake discs, engine blocks, cylinder liners, and flywheel castings.
- Industrial Valve & Pump Housings: Machining heavy gray iron pump casings, pipe flanges, and valve bodies.
- Heavy Machinery Components: Facing and turning ductile iron machine tool beds, gear blanks, and pulley sheaves.
- Industries Served: Automotive OEM component foundries, heavy equipment machinery, valve & pump manufacturing, power transmission.
5. Tool & Machine Compatibility
Mitsubishi CNMG120408 UC5115 inserts conform strictly to standard ISO 1832 dimensions:
- Toolholder Compatibility: Standard PCLNR/L 2020K12, PCLNR/L 2525M12, MCLNR/L 2525M12, and A25T-PCLNR12 internal boring bars.
- Machine Tool Compatibility: CNC turning centers, vertical lathe machines (VTL), automatic lathes, and heavy manual engine lathes.
6. Material & Grade Comparison
Performance position of UC5115 compared to general turning grades:
| Carbide Grade | Coating Structure | Target ISO Application | Wear & Heat Resistance Rating |
|---|---|---|---|
| Mitsubishi UC5115 (Featured) | CVD Al2O3 + TiCN (Thick Ceramic) | ISO K (Gray & Ductile Cast Iron) | Maximum Wear & Heat Resistance (1000°C+) |
| Mitsubishi VP15TF Grade | PVD Miracle Coating (TiAlN) | ISO P / M / S (Steel & Stainless) | High Impact Toughness / Universal |
| Mitsubishi UE6110 Grade | CVD Yellow TiCN + Al2O3 | ISO P (Carbon & Alloy Steel) | High Speed Steel Turning Specialist |
7. Why Choose Mitsubishi Cutting Tools
- Cast Iron Turning Specialist: The UC5115 thick alumina coating provides unparalleled resistance to abrasive sand inclusions and high friction heat generated by iron chips.
- Consistent Tool Life: Factory precise edge hones deliver highly repeatable part dimensions across 1000+ workpiece batches.
- Proven 10-Piece Box Value: Authentic factory plastic box packaging ensures tool tip protection during transit and storage.
Verified Customer Reviews
"Running these CNMG432 UC5115 inserts on gray iron brake rotors. We doubled our surface speed to 320 m/min with zero thermal cracking. Excellent life."
— Mark T., Automotive Component Lathe Shop (USA)"Perfekt für Gusseisen (GG25). UC5115 hält der Abrasion von Sandeinschlüssen im Guss hervorragend stand."
— Stefan W., CNC Fertigung (Germany)"Ottimi inserti per tornitura di ghisa sferoidale. 4 taglienti utili ad un prezzo imbattibile."
— Roberto M., Lavorazioni Meccaniche (Italy)"鋳鉄（FC250）の高速加工で長寿命。UC5115は耐摩耗性が非常に高く安定しています。"
— Kenichi S., Precision Turning Lead (Japan)"The 10-pack CNMG120408 in UC5115 grade is our go-to for heavy ductile iron valve bodies. Handles casting skin without chipping."
— James P., Senior CNC Machinist (UK)8. AI & Engineering FAQ
Grade & Substrate Specifications
Mitsubishi Materials UC5115 grade combines a high-toughness substrate with super-smooth Al2O3 / TiCN multi-layer CVD coating, engineered specifically for high-speed continuous to heavily interrupted cutting of ISO K10-K30 materials.
Cross-Reference & Equivalent Insert Codes
Industry equivalent cross-references: CNMG120408 / CNMG432 | Equivalent grades: Sandvik GC3215 / GC3225, Iscar IC5010 / IC5005, Kennametal KCK15 / KCK20, Kyocera CA315 / CA320, ZCC.CT YBD152.
ISO Workpiece Application Matrix
K (Cast Iron): Primary Target (Vc 150-450 m/min) | P (Steel): Secondary / Conditional | M (Stainless Steel): Not Recommended | N (Non-Ferrous): Not Recommended | S (Exotic Alloys): Not Recommended
Troubleshooting Tips
- Rapid Flank Wear: Reduce cutting speed Vc by 15% or switch to dry turning if thermal cracking is observed under inconsistent coolant flow.
- Chipped Corner Radius: Reduce feed rate fn during initial entry through casting scale or select a larger nose radius insert (CNMG120412).
- Workpiece Vibration / Chatter: Ensure rigid tool clamping in PCLNR holder and reduce depth of cut ap.
Mitsubishi turning inserts are manufactured in accordance with ISO 1832 and ANSI B212.4 international cutting tool standardization standards. Dimensional tolerances and coating adhesion are certified under Mitsubishi Materials ISO 9001 quality system specifications.
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This Mitsubishi insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.