Mitsubishi SCMT120404 US735 Carbide Insert | MMC Japan Genuine
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SCMT120404 US735
Mitsubishi Materials | The Stainless Steel & Interrupted Cut Specialist
The Mitsubishi SCMT120404 US735 is a high-toughness indexable turning insert specifically designed for the most demanding stainless steel turning environments. Utilizing the specialized US735 CVD coating, this insert excels in heavy interrupted cuts and unstable machining conditions where other grades chip. With a 0.4mm nose radius, it is the ideal choice for precision machining and achieving a superior surface finish on difficult-to-cut alloys.
ISO Designation Decoded
Square 90°
7° Relief Angle
M-Class Tolerance
With Hole
12.7mm Size
4.76mm Thick
0.4mm Radius
Technical Specifications
| Feature | Metric Designation | Inch (ANSI) Designation |
|---|---|---|
| Model Name | SCMT120404 | SCMT 431 |
| Inscribed Circle ($IC$) | 12.7 mm | 1/2" |
| Thickness ($S$) | 4.76 mm | 3/16" |
| Corner Radius ($R_e$) | 0.4 mm | 1/64" |
US735 Grade Performance
The US735 grade is Mitsubishi's premier CVD coated carbide for ISO-M (Stainless Steel) applications. It is engineered with a high-toughness substrate that effectively prevents thermal cracking and notch wear. This makes it a "problem solver" grade for CNC machining of austenitic stainless steels (304, 316) and duplex steels where tool reliability is the top priority.
Precision S-Type Geometry
As an S-Type (Square) insert with a 7° positive relief, this geometry reduces cutting resistance and heat generation. The 04 (0.4mm) radius is optimized for finishing and semi-finishing operations, ensuring high dimensional accuracy and reducing the risk of vibration on small-diameter lathe turning tasks.
Recommended Cutting Parameters
Optimized for Stainless Steel (ISO M10 - M30)
| Material | Cutting Speed ($v_c$) | Feed Rate ($f$) | Depth of Cut ($a_p$) |
|---|---|---|---|
| Austenitic (304, 316) | 100 - 180 m/min | 0.10 - 0.25 mm/rev | 0.5 - 2.5 mm |
| Ferritic/Martensitic | 120 - 220 m/min | 0.08 - 0.20 mm/rev | 0.3 - 2.0 mm |
COMPATIBLE LATHE TOOL HOLDERS
The SCMT1204 series is designed for Mitsubishi SSDCN or SSBCR/L external turning holders and heavy-duty boring bars.
View S-Type 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.