CCMT09T304 is a positive, 80-degree diamond-shaped carbide indexable insert commonly used for external turning, internal turning, and boring. Its standard size designation indicates an inscribed circle of approximately 9.525 mm, a nominal thickness of approximately 3.97 mm, and a nose radius of 0.4 mm. The insert normally has a 7-degree clearance angle and is used in a compatible toolholder with the matching seat, screw, and clearance requirements.
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At KEUE CNC, we treat CCMT09T304 as an insert size designation rather than a complete cutting solution. The substrate, coating, chipbreaker, tolerance class, and holder geometry must still be selected according to the workpiece material and machining operation. Buyers should confirm the complete manufacturer code before placing a production order.
The code follows the general ISO designation system for indexable cutting inserts. “C” identifies the insert shape as an 80-degree diamond or rhombic form, while the second “C” identifies a nominal 7-degree clearance angle. “M” refers to the insert tolerance class, and “T” identifies the insert design family used in the product code.
The numerical section provides the main size information. “09” refers to the inscribed circle size, “3” identifies the nominal insert thickness series, and “04” indicates a 0.4 mm nose radius. The exact dimensional tolerance, hole geometry, chipbreaker, and cutting-edge configuration should be verified against the applicable product catalog or technical drawing.
| Code section | Typical meaning | Buyer relevance |
|---|---|---|
| CC | 80-degree diamond shape with approximately 7-degree clearance | Determines cutting geometry and holder compatibility |
| M | Insert tolerance class | Indicates the dimensional tolerance category |
| T | Insert design family | Must match the toolholder seat and clamping method |
| 09 | Approximately 9.525 mm inscribed circle | Defines the insert size class |
| 3 | Approximately 3.97 mm nominal thickness | Must match holder pocket depth and screw position |
| 04 | 0.4 mm nose radius | Influences finish, cutting force, and corner strength |
These interpretations are based on the ISO insert designation framework, including ISO 1832. Because commercial manufacturers may add suffixes for chipbreakers, coatings, substrates, and application grades, the base code alone does not identify one universal cutting performance level.
The most commonly referenced dimensions for CCMT09T304 are an inscribed circle of approximately 9.525 mm, a nominal thickness of approximately 3.97 mm, and a nose radius of 0.4 mm. These values are commonly expressed in metric units, although the 9.525 mm inscribed circle is also associated with the 3/8-inch size family. Actual dimensions can vary within the applicable tolerance class.
The 80-degree included cutting shape provides a useful balance between accessibility and edge strength. Its positive clearance geometry can reduce interference during internal turning and boring, but the available clearance still depends on the holder, boring bar diameter, workpiece bore, and machining direction. I recommend checking the tool assembly drawing rather than relying only on the insert code.
A 0.4 mm nose radius is commonly selected when a buyer needs a relatively fine finish and moderate cutting forces. A smaller radius can improve access and reduce radial cutting force, while a larger radius may provide greater edge support but can increase cutting force and vibration risk. The suitable radius depends on workpiece rigidity, depth of cut, feed rate, and the required surface finish.
For example, a buyer should not assume that a 0.4 mm radius will always produce a specific roughness value. Surface finish is affected by feed, tool condition, material, machine stability, coolant, insert geometry, and setup rigidity. Any finish target should therefore be confirmed through machining trials or the insert supplier’s recommended cutting data.
CCMT09T304 is commonly associated with turning applications that require a positive insert and a relatively accessible 80-degree cutting point. Typical uses include internal turning, boring, facing, shoulder work with suitable clearance, and light to medium finishing operations. The insert may also be used for external turning when the toolholder is designed for the same insert geometry.
In boring operations, the complete tool system is especially important. A small-diameter boring bar may be sensitive to overhang, while an unsuitable insert geometry can cause rubbing, chatter, or poor chip control. I recommend confirming the minimum bore diameter, maximum recommended overhang, clamping screw, and holder orientation before selecting the insert.
CCMT09T304 describes the geometry and size, not the carbide grade. The same insert size may be available in different carbide substrates and coatings for steel, stainless steel, cast iron, non-ferrous metals, or difficult-to-machine alloys. A P-grade commonly targets steels, an M-grade commonly targets stainless steels, and an N-grade is often used for aluminum and other non-ferrous materials, but the exact grade designation varies by manufacturer.
Coated carbide grades may use coating systems based on materials such as titanium carbonitride, titanium nitride, aluminum oxide, or aluminum titanium nitride. The presence and composition of a coating must be confirmed from the supplier’s technical data; it should not be inferred from the CCMT09T304 code. For aluminum, buyers should also evaluate edge sharpness, rake geometry, and resistance to built-up edge rather than selecting only by insert size.
The chipbreaker suffix is often more important than the base CCMT code for day-to-day cutting performance. Finishing chipbreakers generally target lower feeds and lighter cuts, while medium or roughing geometries may provide stronger edges for higher material removal. The correct choice depends on cutting depth, feed rate, material hardness, coolant strategy, and whether the operation is internal or external.
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When requesting a quotation, I suggest specifying the full insert code, workpiece material, hardness range, operation type, target feed, depth of cut, and machine condition. This information allows a supplier to recommend a suitable grade and chipbreaker instead of offering an interchangeable size with uncertain performance.
First, compare the complete insert designation with the toolholder documentation. The holder must be designed for the same CCMT geometry, size class, hole style, and clamping arrangement. A similar-looking insert may not seat correctly if its clearance angle, thickness, hole, or corner orientation differs.
For boring, confirm the boring bar diameter, insert pocket, screw size, and minimum recommended bore. The toolholder must provide sufficient clearance behind the cutting edge, especially in deep internal holes or stepped bores. A CCMT09T304 insert should not be installed in a holder intended for a different insert family merely because the insert appears to fit physically.
Check whether the holder is right-hand, left-hand, or neutral, and confirm the required spindle direction. Insert orientation affects cutting-edge presentation, chip flow, and approach clearance. This check is particularly important for internal boring, where the available space is limited and the tool may contact the bore wall.
Match the insert grade and chipbreaker to the material being machined. Steel, stainless steel, cast iron, aluminum, and hardened materials can require different edge preparations and coating systems. Cutting speed and feed recommendations should come from the selected grade manufacturer, because the base CCMT09T304 designation does not provide universal cutting parameters.
A 0.4 mm nose radius may be appropriate for many finishing and general-purpose operations, but it can influence corner blending and profile accuracy. If the drawing specifies a small internal radius, the insert nose radius and tool approach angle must be checked together. Buyers should also consider whether the programmed feed and machine rigidity are suitable for the selected radius.
One common mistake is purchasing a CCMT09T304 insert without identifying the chipbreaker and grade. Another is assuming that every 09-size CCMT insert uses the same screw, hole geometry, and seating arrangement. A third mistake is choosing a fine finishing geometry for an interrupted cut or a heavy roughing operation without confirming edge strength.
Buyers should also avoid comparing price only by the base code. Two inserts marked CCMT09T304 may differ in coating, substrate, tolerance, chipbreaker, packaging quantity, and recommended application range. A lower unit price may not represent lower total cost if tool life, chip control, or changeover frequency is unsuitable.
As a Boring Tool manufacturer and supplier, KEUE CNC can help buyers organize the technical information required for a CCMT09T304 sourcing decision. We can review the target operation, workpiece material, boring diameter, toolholder model, cutting depth, feed range, and required surface finish. This process helps distinguish a correct insert replacement from a visually similar but incompatible alternative.
For repeat purchasing, I recommend confirming the full insert code, grade, chipbreaker, packaging quantity, inspection requirements, and delivery schedule in the quotation. Where the buyer provides a toolholder drawing or an existing insert sample, we can use that information to reduce compatibility uncertainty. Any material certification, inspection document, or customization requirement should be agreed before order confirmation.
CCMT09T304 is a practical insert size for many turning and boring operations, especially where an 80-degree positive geometry and a 0.4 mm nose radius suit the workpiece and toolholder. Its approximate 9.525 mm inscribed circle and 3.97 mm thickness provide the basic size reference, but they are not sufficient for final selection. Buyers must verify the complete product code and the holder manufacturer’s compatibility requirements.
As the next step, prepare your toolholder or boring-bar model, workpiece material, bore diameter, cutting depth, feed range, and finish target. Send these details to KEUE CNC for a B2B quotation and technical review of the suitable CCMT09T304 grade, chipbreaker, packaging, and supply requirements. This approach provides a more reliable basis for purchasing than comparing the base insert code alone.
Reference: ISO 1832, Indexable inserts for cutting tools—Designation; buyers should also verify final dimensions and application data against the selected manufacturer’s current technical catalog.
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