Mitsubishi SNMA120408 UC5105 Turning Insert | Cast Iron Specialist
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SNMA120408 UC5105
Mitsubishi Materials | High-Speed Cast Iron Turning Specialist
The Mitsubishi SNMA120408 UC5105 is a high-performance indexable turning insert specifically engineered for the high-speed machining of cast iron. Utilizing the UC5105 CVD coating, this insert is the benchmark for gray cast iron (FC) and ductile iron (FCD). Featuring a flat-top geometry (no chipbreaker), it provides maximum edge strength for heavy-duty roughing and continuous cutting, ensuring long-term wear resistance and dimensional stability in high-volume CNC turning.
Packaging: Original Mitsubishi Box of 10 Inserts
ISO Designation Decoded
Square 90°
0° Relief
M-Class Tol.
Fixing Hole
12.7mm Size
4.76mm Thick
0.8mm Radius
Technical Specifications
| Feature | Metric Designation | Inch (ANSI) Designation |
|---|---|---|
| Model Name | SNMA120408 | SNMA 432 |
| Inscribed Circle ($IC$) | 12.7 mm | 0.500" (1/2") |
| Thickness ($S$) | 4.76 mm | 0.187" (3/16") |
| Corner Radius ($RE$) | 0.8 mm | 0.031" (1/32") |
UC5105 Grade Breakdown
The UC5105 grade is Mitsubishi's premium CVD coated carbide optimized for ISO K05-K15 applications. It features a thick, heat-resistant Al2O3 layer and a specialized TiCN layer that resists plastic deformation even at ultra-high cutting speeds. This makes it perfect for high-speed machining of gray cast iron without sacrificing tool life.
SNMA Flat-Top Geometry
The SNMA geometry signifies a flat-top insert without a chipbreaker groove. This design is preferred for turning cast iron where the chips are naturally short and brittle. By removing the chipbreaker, the edge strength is significantly increased, making it the ideal choice for heavy roughing cuts or interrupted machining on abrasive casting surfaces.
Recommended Cutting Parameters
Optimized for Cast Iron Turning (UC5105)
| Workpiece Material | Cutting Speed ($v_c$) | Feed Rate ($f$) | Depth of Cut ($a_p$) |
|---|---|---|---|
| Gray Cast Iron (FC) | 200 - 600 m/min | 0.15 - 0.50 mm/rev | 1.0 - 5.0 mm |
| Ductile Cast Iron (FCD) | 150 - 400 m/min | 0.15 - 0.40 mm/rev | 1.0 - 4.0 mm |
TOOL HOLDER COMPATIBILITY
Compatible with all standard PSSNR/L or DSBNR/L 90° turning tool holders.
Shop Turning Tool Holders →
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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.