CCMT09T304 is a positive, 80° diamond-shaped carbide insert commonly used for internal turning, boring, profiling, and selected external turning operations. In the ISO designation, “CCMT” identifies the insert geometry family, “09” indicates the insert size series, “T3” identifies the hole and chip-control configuration, and “04” normally represents a 0.4 mm nose radius. At KEUE CNC, I recommend confirming the insert drawing, grade, chipbreaker, cutting direction, and boring-bar seat before ordering, because the same designation can be offered in different carbide grades and coatings.
This guide explains what CCMT09T304 means, which boring tools can accept it, how to match it with workpiece materials, and what B2B buyers should verify before requesting a quotation. It is intended for machining engineers, tool distributors, procurement teams, and OEM buyers sourcing boring inserts or complete boring-tool solutions.
CCMT09T304 is a replaceable carbide insert with a positive cutting geometry. Its diamond shape and positive clearance are suitable for boring tools that require controlled cutting forces and access to internal features. The insert is normally secured to a compatible toolholder with a central screw, but the exact screw, seat design, and clamping arrangement must match the boring bar manufacturer’s specification.
The final “04” is generally associated with a 0.4 mm nose radius. This radius provides a practical balance between edge access, surface-finish potential, and cutting-edge strength for many light and medium machining operations. It is not automatically the correct choice for every bore: a larger radius may improve edge strength, while a smaller radius may reduce cutting force in delicate internal work.
Typical workpiece groups include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals. However, the insert geometry alone does not determine performance. Workpiece hardness, coolant conditions, bore depth, machine rigidity, tool overhang, and the selected coating or substrate all influence the result.
| Feature | What It Indicates | Buyer Verification Point |
|---|---|---|
| CCMT | Positive insert geometry and 80° diamond shape | Confirm the toolholder is designed for CCMT inserts |
| 09 | Insert size series | Check the manufacturer’s dimensional drawing |
| T3 | Hole and chip-control configuration | Match the screw, countersink, and insert seat |
| 04 | Normally a 0.4 mm nose radius | Confirm the actual radius and tolerance in the product data |
Buyers should not select a boring bar only because it is described as “CCMT compatible.” The insert pocket must support the correct insert size, included angle, seating surface, screw direction, and cutting orientation. A mismatch can cause unstable clamping, incorrect tool height, premature edge damage, or interference inside the bore.
A CCMT09T304 insert is generally used with a compatible positive boring bar or internal turning holder. The bar may be right-hand, left-hand, or neutral depending on the machine setup and cutting direction. Buyers should compare the complete insert code with the toolholder catalog rather than relying on the word “CCMT” alone.
For internal machining, the minimum bore diameter is especially important. It depends on the boring-bar diameter, insert clearance, nose geometry, approach angle, and the shape of the internal feature. A practical purchase inquiry should include the minimum bore diameter, maximum boring depth, workpiece material, machine interface, and required surface finish.
Start with the material being cut and its condition. Low-carbon steel, hardened alloy steel, stainless steel, cast iron, aluminum, and copper alloys require different edge preparation, coating systems, and chipbreaker designs. If the material grade or hardness is unknown, I recommend providing the closest available specification and noting whether the material is forged, cast, annealed, or heat-treated.
Separate rough boring, semi-finishing, finishing, shoulder boring, and interrupted cutting. A sharper positive edge may be suitable for light finishing, while a reinforced edge can be safer for interrupted cuts or less stable machines. The CCMT09T304 geometry may support several operations, but the chipbreaker and carbide grade should be selected for the actual cutting load.
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Review the boring-bar diameter, overhang, clamping method, spindle capacity, coolant delivery, and machine rigidity. Long overhangs increase the risk of vibration, especially in internal machining where chip evacuation is restricted. As a starting point, buyers should treat tool overhang as a critical stability variable and ask the supplier to recommend a bar proportioned to the bore depth rather than selecting the smallest possible holder.
The 0.4 mm nose radius associated with CCMT09T304 is often chosen when access and moderate cutting forces are important. It may be a sensible option for smaller internal features, but it should not be treated as a universal finishing solution. Insert grade selection should consider cutting speed, feed rate, hardness, coolant, and the risk of built-up edge or thermal wear.
Cutting data should come from the selected grade and chipbreaker manufacturer, then be adjusted through controlled trials. For example, the insert radius is 0.4 mm, but the achievable feed, speed, and depth of cut cannot be determined from the code alone. I recommend testing one variable at a time and recording tool life, surface roughness, burr formation, chip control, and dimensional stability.
| Application | Potential Suitability | Important Considerations |
|---|---|---|
| Steel internal finishing | Often suitable with an appropriate coated grade | Control vibration and verify chip evacuation |
| Stainless steel boring | Possible with a sharp edge and suitable chipbreaker | Reduce work hardening and avoid dwell |
| Cast iron boring | Possible with a grade designed for abrasive cutting | Manage dust, edge chipping, and coolant requirements |
| Aluminum or non-ferrous alloys | Possible with a polished or non-ferrous-specific edge | Prevent built-up edge and confirm chipbreaker suitability |
These application categories are selection guidance rather than guaranteed performance results. In particular, hardened materials, abrasive castings, high-temperature alloys, and interrupted bores may require a different insert geometry or grade. When the bore is deep or the tolerance is tight, the boring bar and setup can matter as much as the insert itself.
Another frequent error is comparing quotations only by unit price. A lower-cost insert may have a different substrate, coating, chipbreaker, tolerance class, or packaging specification. For production purchasing, the more useful comparison includes consistency between batches, technical support, replacement availability, lead-time reliability, and the supplier’s ability to provide the required documentation.
At KEUE CNC, we support B2B buyers with CCMT09T304 boring inserts and related boring-tool selection. We can help review the workpiece material, machining operation, toolholder interface, insert grade, chipbreaker, coating, and packaging requirements before quotation. Where the application is not fully defined, we use conservative recommendations and clearly identify which details still require confirmation.
For a useful inquiry, please provide the full insert code, required quantity, target material, hardness if available, bore diameter, machining depth, machine type, coolant condition, and delivery location. If you are replacing an existing insert, a photograph of the insert marking and toolholder pocket can reduce the risk of selecting an incompatible substitute. We can then clarify available specifications, production arrangements, sampling requirements, and commercial terms without presenting unverified performance claims.
CCMT09T304 is a practical positive insert option for compatible boring tools, especially where a 0.4 mm nose radius, compact access, and controlled cutting forces are relevant. Correct selection depends on more than the insert code: the boring-bar seat, tool orientation, workpiece material, chipbreaker, carbide grade, coating, and machining conditions must work together. The safest approach is to verify the complete specification and test the selected configuration under controlled cutting conditions.
If you are sourcing CCMT09T304 for production, send KEUE CNC your application details and target quantity. I can help you organize the required specifications for a clear quotation and recommend a compatible boring-tool solution based on the information available.
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