Mitsubishi CNMG120408-MA UC5115 Cast Iron Turning Insert (10pcs)
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CNMG120408-MA UC5115
The Cast Iron Specialist | UC5115 CVD Hardness | Abrasive Resistance Geometry
Engineered for Abrasive Environments
UC5115 Grade (Ultra-Hard CVD Coating): The UC5115 is Mitsubishi's flagship grade for K-Class (Cast Iron). Cast iron is notoriously abrasive, leading to rapid flank wear. The UC5115 substrate is paired with a specialized TiCN + Al2O3 coating that offers extreme hardness and thermal stability, ensuring the cutting edge remains sharp even when machining "crusty" castings.
MA Chipbreaker (The Multi-Material Standard): The MA geometry on this cast iron grade is designed for medium-range cutting. While cast iron typically produces short chips, the MA chipbreaker provides the necessary clearance to reduce cutting resistance and heat buildup at the tip, extending tool life during long production runs.
0.8mm (1/32") Universal Radius: The 08 radius is the industry standard for balancing edge toughness and surface finish. It provides enough mass to resist the high-frequency micro-impacts found in ductile iron turning while maintaining Ra quality for finishing passes.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | CNMG120408-MA | 12.7 mm | 4.76 mm | 0.80 mm |
| Imperial | CNMG432-MA | 1/2" | 3/16" | 0.0315" (1/32") |
Cast Iron Cutting Parameters
*Optimized for Dry Cutting. Cast iron typically does not require coolant; dry machining helps prevent thermal cracking of the CVD layer.
| Workpiece Material | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Grey Cast Iron (HT250 / G25) | 150 - 350 m/min | 0.15 - 0.45 mm/r | 0.50 - 4.50 mm |
| Ductile / Nodular Iron (QT450) | 120 - 280 m/min | 0.15 - 0.40 mm/r | 0.50 - 4.00 mm |
Recommended Tool Holders
Maximum rigidity for cast iron turning with DCLNR/L 12 series holders:
Shop DCLNR 12 HoldersPro-Tip: UC5115 vs. UE6020
UC5115 (The Iron Master): Specifically for Cast Iron. It is harder than steel grades to combat abrasion. Do not use for Steel as the cutting edge may be too brittle for the stringy chips.
Interrupted Cuts: If you are machining cast iron with heavy interruptions (like bolting flanges), ensure your machine is rigid. UC5115 loves high speeds but requires stability.
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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.