Mitsubishi SCMT120408 US735 Carbide Insert | Genuine MMC Japan
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SCMT120408 US735
Mitsubishi Materials | The Toughened Stainless Steel Specialist
The Mitsubishi SCMT120408 US735 is a high-performance indexable turning insert specifically engineered for difficult-to-cut materials. Utilizing the legendary US735 CVD coating, this insert is the industry's "problem solver" for stainless steel turning and heavy interrupted cuts. Its 0.8mm nose radius provides a reinforced cutting edge that excels in high-feed machining, ensuring maximum reliability where standard inserts fail due to thermal shock or mechanical impact.
ISO Designation Decoded
Square 90°
7° Relief Angle
M-Class Tolerance
Countersink Hole
12.7mm Size
4.76mm Thick
0.8mm Radius
Technical Specifications
| Feature | Metric Designation | Inch (ANSI) Designation |
|---|---|---|
| Model Name | SCMT120408 | SCMT 432 |
| Inscribed Circle ($IC$) | 12.7 mm | 1/2" |
| Thickness ($S$) | 4.76 mm | 3/16" |
| Nose Radius ($R_e$) | 0.8 mm | 1/32" |
US735 Grade Superiority
The US735 grade is Mitsubishi's specialized CVD (Chemical Vapor Deposition) coating optimized for austenitic stainless steel. It features a high-toughness substrate that provides extreme resistance to thermal cracking and boundary damage. This makes it indispensable for precision machining in 304/316 stainless and nickel-based superalloys where heat generation is high.
0.8mm Nose Radius (08)
The 0.8mm radius (08) offers significantly higher edge strength compared to 0.4mm versions. It allows for increased feed rates and handles deeper depths of cut without chipping. This geometry is perfect for medium-to-rough lathe turning, where productivity and tool life are prioritized over extremely fine surface finishing.
Recommended Cutting Parameters
Optimized for Stainless Steel (ISO M10 - M30)
| Workpiece Material | Cutting Speed ($v_c$) | Feed Rate ($f$) | Depth of Cut ($a_p$) |
|---|---|---|---|
| Austenitic Stainless (304, 316) | 80 - 160 m/min | 0.12 - 0.35 mm/rev | 1.0 - 4.5 mm |
| Duplex / Super Alloys | 40 - 90 m/min | 0.10 - 0.25 mm/rev | 0.8 - 3.5 mm |
LATHE TOOL HOLDER COMPATIBILITY
The SCMT1204 series is designed for Mitsubishi SSDCN external holders or SSBCR/L heavy-duty boring bars.
Shop Compatible 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.