Mitsubishi CNMG120408-GK MC5015 Cast Iron Turning Insert (10pcs)
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CNMG120408-GK MC5015
Cast Iron Powerhouse | MC5015 Wear Resistance | GK Stable Geometry
Optimized for Heavy-Duty Cast Iron Turning
MC5015 Grade (Nano-Layer CVD): The MC5015 is Mitsubishi's premium solution for K-Class (Cast Iron) materials. It features an ultra-thick alumina ($Al_2O_3$) coating that acts as a thermal and abrasive shield. This grade is specifically engineered to resist flank wear caused by the high graphite content in Gray Iron and the toughness of Ductile (Nodular) Iron.
GK Chipbreaker (Cast Iron Stability): The GK geometry is designed for medium-to-roughing stability. Unlike steel chipbreakers that focus on "breaking" long chips, the GK focus is on Edge Protection. It features a wide, flat land that prevents the edge from micro-chipping when encountering the uneven surface or sand inclusions typical in cast parts.
0.8mm (1/32") Robust Radius: The 08 radius is the global standard for stability. It provides a larger contact area to dissipate heat, making it much more durable than 04 radii when machining high-strength ductile irons at high surface speeds.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | CNMG120408-GK | 12.7 mm | 4.76 mm | 0.80 mm |
| Imperial | CNMG432-GK | 1/2" | 3/16" | 0.0315" (1/32") |
Cast Iron Cutting Parameters
*MC5015 can be run dry in Gray Iron for better tool life. Use coolant in Ductile Iron to prevent heat build-up.
| Material Type | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Gray Cast Iron (G250/FC250) | 250 - 500 m/min | 0.15 - 0.45 mm/r | 1.00 - 4.50 mm |
| Ductile Iron (65-45-12) | 150 - 320 m/min | 0.15 - 0.40 mm/r | 0.80 - 3.50 mm |
Compatible Tool Holders
Maximum rigidity is essential for cast iron machining. Fits DCLNR/L 12 and PCLNR/L 12 holders:
Shop DCLNR 12 HoldersPro-Tip: MC5015 vs. MC5005
MC5015 (The All-Rounder): The standard choice for cast iron. Best for parts with skin, scale, or light interruptions.
MC5005 (The High-Velocity Expert): Only switch to MC5005 if you are machining Gray Cast Iron at ultra-high speeds in a perfectly rigid environment to achieve maximum throughput.
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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.