CCMT09T304 Insert Guide: Dimensions, Grades, and Applications

CCMT09T304 is a positive, 80-degree diamond-shaped carbide turning insert commonly used in boring, internal turning, facing, and light external turning. Its commonly referenced ISO dimensions are approximately 9.525 mm inscribed circle, 3.97 mm thickness, and 0.4 mm nose radius, although the exact dimensions and tolerance can vary by manufacturer and product standard. I recommend confirming the insert drawing, chipbreaker, grade, and toolholder compatibility before placing a production order.

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At KEUE CNC, I treat CCMT09T304 selection as a complete cutting-solution decision rather than a simple size comparison. The workpiece material, machining stability, bore diameter, coolant condition, cutting parameters, and required surface finish all influence whether this insert is appropriate. This guide explains the designation, available material grades, practical applications, buying factors, and supplier checks for B2B users.

Key Takeaways

• CCMT09T304 generally indicates an 80-degree C-shaped insert with positive clearance and a 0.4 mm nose radius.
• The commonly used nominal size is 9.525 mm inscribed circle, with approximately 3.97 mm thickness.
• It is frequently selected for internal boring and light-to-medium turning where reduced cutting resistance is important.
• Carbide grade and chipbreaker should be matched to the workpiece, cutting condition, and production objective.
• Buyers should verify ISO designation, tolerance class, coating, insert geometry, packaging, and toolholder fit before approval.

What Does CCMT09T304 Mean?

The code CCMT09T304 follows an ISO-style insert designation system. Each character communicates information about the insert shape, clearance angle, tolerance, fixing configuration, size, thickness, and nose radius. Because manufacturers may add proprietary chipbreaker or grade suffixes, the base code alone does not always describe the complete cutting solution.

Designation Breakdown

I use the table as a purchasing starting point, not as a substitute for a manufacturer drawing. Different insert families can use similar base codes while varying in chipbreaker design, coating, edge preparation, and tolerance. For export orders, I recommend sending the complete code, technical drawing, and intended workpiece material to the supplier.

CCMT09T304 Dimensions and Geometry

The 0.4 mm nose radius is one of the most important features of this insert. A smaller radius can improve access in narrow internal features and may reduce cutting forces, while a larger radius generally offers greater edge support but requires more clearance and machine stability. CCMT09T304 is therefore often considered a practical option for small bores, shoulder work, profiling, and finishing-oriented operations.

Common Nominal Specifications

These values describe commonly used nominal dimensions, not a universal inspection report for every CCMT09T304 product. I advise buyers to review the actual drawing when interchangeability is important, especially when replacing inserts from another brand. The screw, seat, pocket angle, and chipbreaker shape must also be compatible with the boring bar or turning holder.

Grades and Materials for CCMT09T304

CCMT09T304 is normally produced as a cemented carbide insert with a grade selected for a particular material group and cutting condition. The most suitable grade depends on whether the operation involves steel, stainless steel, cast iron, non-ferrous metal, or difficult-to-machine alloys. A general-purpose grade may be convenient for mixed production, but a dedicated grade can be more appropriate for stable, high-volume work.

Typical Grade Selection Logic

• Carbon and alloy steel: I usually consider a coated carbide grade designed for continuous or moderately interrupted steel cutting.
• Stainless steel: A tougher grade and chipbreaker designed to control work hardening and long chips may be preferable.
• Cast iron: A wear-resistant grade with suitable edge preparation can be considered, particularly where abrasive dust is present.
• Aluminum and other non-ferrous metals: A sharp, polished geometry is often more suitable than a heavy edge preparation.
• Heat-resistant alloys: Buyers should request application guidance because heat generation, notch wear, and low cutting speeds can change the grade decision.

Coating selection should be evaluated together with the substrate and chipbreaker. I avoid presenting one grade as universally optimal because tool life depends on speed, feed, depth of cut, coolant, rigidity, and workpiece condition. If the material specification or machining history is available, KEUE CNC can use it to narrow the grade options more responsibly.

Applications of CCMT09T304

The insert is commonly used with positive turning holders and boring tools. Its geometry can be useful when a machine needs a relatively free-cutting insert for internal diameters, small shoulders, chamfers, and finishing passes. The actual minimum bore depends on the boring bar size, insert orientation, clearance, and required approach angle, so I recommend checking the toolholder manufacturer's limits.

Common Machining Scenarios

• Internal boring of steel and stainless steel components
• Light external turning on compact or slender workpieces
• Facing and shoulder finishing where the 80-degree shape provides suitable access
• Chamfering and profiling with compatible positive holders
• Small-batch production where one insert format serves several operations

The 0.4 mm nose radius can support a reasonable balance between surface finish and feature access. However, surface finish is not determined by nose radius alone; feed rate, vibration, tool overhang, workpiece runout, and machine condition also matter. For a weak setup, I would first review rigidity and tool projection before changing only the insert grade.

How I Select the Right CCMT09T304

Step 1: Confirm the Toolholder

I first verify that the boring bar or turning holder is designed for the exact CCMT09T304 format. The seat, clamping screw, insert orientation, clearance, and approach angle should all be checked. A similar-looking insert may not clamp correctly or may create an unsafe overhang.

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Step 2: Identify the Workpiece Material

Next, I classify the workpiece and review its hardness, casting or forging condition, interrupted features, and tendency to form long chips. This information guides the carbide substrate, coating, chipbreaker, and edge preparation. If the material is unknown or supplied under a trade name, a material certificate or composition range can reduce selection risk.

Step 3: Define the Cutting Objective

The best insert for roughing is not always the best insert for finishing. I ask whether the priority is tool life, surface finish, dimensional consistency, chip control, reduced cutting force, or flexible use across several machines. Feed and depth of cut should be selected within the grade and chipbreaker manufacturer's recommended range rather than copied from an unrelated insert.

Step 4: Review Production Conditions

Stable continuous cutting, interrupted cutting, dry machining, flood coolant, and high-pressure coolant create different demands. I also review spindle power, workholding, tool overhang, and expected batch volume. These factors help determine whether a sharper positive edge or a tougher reinforced edge is more appropriate.

Common Buyer Mistakes

One common mistake is ordering only by the base code while ignoring the chipbreaker and grade suffix. Another is assuming that every CCMT09T304 insert has identical coating performance or dimensional tolerance. I also see buyers overlook the nose-radius effect on finish, clearance, and cutting force when changing from one insert family to another.

A further risk is approving a sample without recording the complete conditions used during the trial. Cutting speed, feed, depth of cut, coolant, material batch, tool overhang, and failure mode should be documented. This makes supplier comparison more objective and helps distinguish normal wear from problems caused by setup instability.

Pricing, MOQ, and Lead-Time Considerations

CCMT09T304 pricing depends on carbide grade, coating, chipbreaker complexity, packaging quantity, inspection requirements, and order volume. Standard catalog configurations are generally easier to source than special edge preparations or private-label packaging, but I confirm availability before making a delivery commitment. For recurring orders, buyers should compare total supply stability rather than evaluating unit price alone.

MOQ may vary according to stock status and customization requirements. At KEUE CNC, I can discuss standard product supply, packaging identification, sample evaluation, and repeat-order planning based on the requested grade and quantity. Exact lead time should be confirmed in a quotation because production schedule, coating route, inspection scope, and export documentation can affect the timeline.

Supplier Evaluation Checklist

• Request the full product code, grade, chipbreaker, and technical drawing.
• Confirm nominal dimensions and dimensional tolerances.
• Check compatibility with the intended boring bar or turning holder.
• Ask which workpiece materials the grade is designed for.
• Clarify coating type, edge preparation, packaging, and identification method.
• Request a controlled sample plan before approving a large production order.
• Confirm MOQ, available stock, production lead time, inspection documents, and export packing.

I recommend selecting a supplier that can discuss the complete machining application instead of offering only a low-cost insert. Technical communication is especially important when the buyer needs mixed grades, private labeling, repeat supply, or support for internal boring tools. Clear documentation also reduces the risk of receiving a product that matches the code but not the intended cutting performance.

Final Recommendation

CCMT09T304 is a versatile positive insert format for many boring and turning tasks, particularly where the 9.525 mm nominal size, approximately 3.97 mm thickness, and 0.4 mm nose radius fit the toolholder and machining feature. The correct choice still depends on the workpiece material, chipbreaker, carbide grade, machine rigidity, and cutting objective. I would not approve it solely from the designation without checking the supplier drawing and application details.

As a Boring Tool manufacturer and supplier, KEUE CNC can help buyers review the insert specification, compatible holder, grade direction, sample requirements, packaging, and repeat-order plan. Send us the workpiece material, bore or turning operation, machine condition, current insert code, and target quantity for a practical quotation and selection discussion. This information allows me to recommend a more controlled CCMT09T304 solution for your production needs.

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