Mitsubishi CNMG120412-RP MC6025 Heavy Roughing Steel Insert (10pcs)
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CNMG120412-RP MC6025
Maximum Metal Removal | MC6025 Impact Grade | RP Heavy-Feed Geometry
Engineered for Extreme Roughing Conditions
MC6025 Grade (Nano-Texture CVD): The MC6025 is Mitsubishi's benchmark grade for steel turning versatility. It utilizes a Nano-texture CVD coating that provides an incredibly tough Al2O3 layer. This prevents the cutting edge from thermal cracking during heavy roughing and offers the impact resistance necessary to survive interrupted cuts on large forged shafts or hexagonal bars.
RP Chipbreaker (Maximum Edge Support): The RP (Roughing-Positive) geometry is built for high-depth-of-cut (Ap) and high-feed (fn) scenarios. It features a significantly reinforced cutting edge land that resists the massive pressures of heavy chip loads. The "Positive" aspect of the breaker ensures that despite its strength, it still slices through the material with reduced horsepower requirements compared to traditional flat-top roughers.
1.2mm (3/64") Heavy-Duty Radius: The larger 12 radius is the secret to this insert's durability. It provides a massive heat sink at the tool tip and a much stronger corner than the 08 radius, making it nearly immune to corner chipping during heavy scale removal.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | CNMG120412-RP | 12.7 mm | 4.76 mm | 1.20 mm |
| Imperial | CNMG433-RP | 1/2" | 3/16" | 0.0472" (3/64") |
Recommended Roughing Parameters
*The 1.2mm radius allows for higher feed rates. For best surface results, ensure the feed rate is at least 25% of the corner radius.
| Workpiece Material | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Carbon Steel (1045/S45C) | 150 - 320 m/min | 0.30 - 0.70 mm/r | 2.00 - 6.00 mm |
| Alloy Steel (4140/SCM440) | 120 - 280 m/min | 0.25 - 0.60 mm/r | 1.50 - 5.00 mm |
Heavy-Duty Tool Holders
Avoid shim damage under high loads with DCLNR/L 12 or PCLNR/L 12 series holders:
Shop PCLNR 12 HoldersPro-Tip: When to choose the 1.2mm (12) Radius
Efficiency: Use the 1.2mm radius when you need to push feed rates above 0.45 mm/r while maintaining edge stability.
Interrupted Cuts: If you are breaking corners on an 0.8mm (08) insert while roughing, the 1.2mm radius is the immediate solution to increase process security and tool life.
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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.