The CCMT09T304 is a positive, 80° diamond-shaped carbide turning insert with a nominal 0.4 mm nose radius. In the commonly used ISO designation, “CCMT” identifies the insert shape, clearance angle, tolerance class, and chip-breaker or hole configuration, while “09T304” generally indicates a 9.525 mm inscribed circle, approximately 3.97 mm thickness, and a 0.4 mm corner radius. I recommend it for finishing and light-to-medium turning where tool access, low cutting resistance, and a sharp cutting edge are important.
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This guide explains the insert dimensions, holder compatibility, suitable workpiece materials, purchasing factors, and practical selection limits. At KEUE CNC, we supply boring-tool and turning-insert solutions for buyers who need consistent specifications, application guidance, and dependable production support.
The CCMT09T304 is not simply a generic carbide tip; each letter and number provides information needed for tool selection. The first “C” describes an 80° rhombic insert shape, and the second “C” commonly identifies a 7° positive clearance angle. “M” represents the insert tolerance class, while “T” identifies the hole and chip-control configuration used in the relevant standard designation.
| Designation element | Typical meaning |
|---|---|
| CC | 80° diamond shape with approximately 7° positive clearance |
| M | Medium tolerance class |
| T | Single-sided insert configuration with a central hole and chip-control geometry |
| 09 | Nominal 9.525 mm inscribed-circle size |
| 304 | Approximately 0.4 mm nose radius |
For the standard CCMT09T304 size, the nominal inscribed circle is approximately 9.525 mm, the thickness is commonly about 3.97 mm, and the nose radius is 0.4 mm. Exact dimensions can vary slightly by standard interpretation, manufacturer drawing, or chip-breaker design, so I advise buyers to confirm the supplier’s dimensional drawing before ordering large quantities. The insert’s positive geometry helps reduce cutting resistance compared with many negative inserts, but it also provides less edge support under severe interrupted cutting.
A 0.4 mm nose radius is a practical choice when the buyer needs a balance between surface finish, cutting force, and edge accessibility. A smaller radius can reduce cutting load and improve access to narrow features, while a larger radius may offer greater edge strength and better theoretical finish at suitable feed rates. The actual finish depends on feed, machine rigidity, insert geometry, workpiece material, overhang, coolant, and tool condition rather than nose radius alone.
CCMT inserts are generally positive inserts with a central mounting hole and a clearance angle intended for use in compatible toolholders. The “T” configuration should not be treated as interchangeable with every CCMT insert from every manufacturer, because chip-breaker form, seating details, and screw dimensions may differ. Before purchasing, I recommend matching the insert code with the holder manufacturer’s specification and checking the screw head, seat, and clamping direction.
The CCMT09T304 is commonly selected for external turning, internal turning, facing, chamfering, and boring operations when the toolholder provides the correct positive clearance. Its 80° shape gives useful access to many shoulders and profiles, while the 0.4 mm radius supports finishing and moderate material-removal work. It is often considered for steel, stainless steel, cast iron, aluminum alloys, copper-based materials, and selected non-ferrous applications when the grade and chip breaker are correctly matched.
For boring operations, the insert can be useful where the bore diameter allows adequate tool clearance and where the boring bar is designed for a CCMT09T3 insert. I would not select it only by bore diameter, however. Internal turning also depends on boring-bar diameter, minimum bore size, tool overhang, coolant access, spindle power, and the risk of vibration.
Compatibility requires more than matching the letters “CCMT.” The holder must be designed for the 09T3 size family, provide the required positive clearance, and use a clamping system that securely locates the insert against the seat. For external turning, buyers may compare right-hand, left-hand, and neutral holders according to spindle direction and machining access. For boring, the bar must provide sufficient rigidity and the correct insert pocket orientation.
I recommend checking four points before placing an order: insert size, pocket geometry, mounting screw specification, and cutting orientation. The holder pocket must support the insert without rocking, and the screw must provide secure clamping without damaging the hole. If the insert is intended for a branded holder, the buyer should send the holder model, a pocket drawing, or a clear photograph to the supplier for confirmation.
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One frequent mistake is assuming that all 0.4 mm nose-radius CCMT inserts have identical chip breakers and mounting behavior. Another is using a CCMT09T304 in a holder intended for a different size, such as a smaller 06T2 or larger 12T3 family. I also advise against substituting a positive insert into a negative holder or relying on visual similarity when screw and seating dimensions have not been checked.
I begin with the machining operation, workpiece material, and required surface condition rather than starting with price. Next, I confirm whether the cut is continuous, interrupted, external, or internal, because each condition changes the required edge strength and chip-control behavior. Finally, I verify the holder, machine capability, coolant approach, and expected production volume.
As a practical reference, buyers should communicate feed in millimeters per revolution, cutting speed in meters per minute, and depth of cut in millimeters. I do not recommend publishing one universal cutting parameter because grade, chip breaker, material hardness, machine rigidity, and coolant can change the suitable range substantially. A controlled trial using the actual machine and workpiece remains the safest way to finalize parameters.
The insert code alone does not define the complete purchasing specification. Buyers should also request the carbide grade, coating type, chip-breaker designation, edge preparation, applicable material groups, inspection method, packaging quantity, and lot identification. If the application involves stainless steel, hardened material, high-temperature alloy, or interrupted cutting, the grade selection deserves particular attention.
MOQ and lead time depend on whether the required item is a standard stocked product, a private-label configuration, or a customized grade and packaging solution. For repeat production, I suggest confirming forecast demand, acceptable substitutions, labeling requirements, and inspection documentation before the purchase order. This approach can reduce the risk of receiving an insert with the correct base code but an unsuitable chip breaker or grade.
At KEUE CNC, I focus on helping industrial buyers specify the complete cutting-tool requirement instead of selecting an insert code in isolation. Our support can cover CCMT09T304 insert configuration, boring-tool compatibility, application matching, packaging discussion, and sourcing communication for standard or project-based requirements. The final recommendation depends on the buyer’s workpiece, machine, holder, cutting conditions, and quality target.
For an accurate quotation or compatibility review, send the required insert code, workpiece material, operation type, holder or boring-bar model, estimated quantity, and destination market. If you are replacing an existing insert, a photograph of the insert and holder marking can also help clarify the specification. We can then review the requirement and identify the appropriate grade, chip breaker, supply format, and next step for sampling or production purchasing.
The CCMT09T304 is a strong candidate for finishing and light-to-medium turning or boring when its 0.4 mm nose radius, positive geometry, and 09T3 size match the operation. It is not a universal solution for heavy interrupted cuts, unstable boring setups, or every workpiece material. The right decision depends on the complete combination of insert grade, chip breaker, holder, machine rigidity, cutting conditions, and production requirements.
As the next step, verify the nominal dimensions against the supplier drawing, confirm the holder pocket and screw, and provide your material and machining conditions for grade selection. KEUE CNC can support your evaluation of CCMT09T304 inserts and compatible boring-tool solutions for sampling, repeat purchasing, or project sourcing. Contact our team with your specification so we can help turn the insert code into a complete, usable procurement solution.
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