A TNMG 160404 insert is a triangular, negative-rake carbide cutting insert commonly used for CNC turning, facing, profiling, and selected boring operations. Its standard size designation generally indicates an inscribed circle of approximately 9.525 mm, an insert thickness of about 4.76 mm, and a nose radius of 0.4 mm. At KEUE CNC, we supply boring and turning tool solutions around this insert format, while recommending that buyers confirm the exact manufacturer drawing, chipbreaker, grade, and holder compatibility before placing an order.
The TNMG 160404 is not a complete cutting tool by itself. It must be mounted in a compatible toolholder and selected with a carbide grade and chipbreaker suitable for the workpiece material and machining conditions. Because the insert is negative-rake and triangular, it is often chosen when edge strength, indexing flexibility, and stable production turning are more important than very light cutting forces.
The code follows the general ISO insert identification system. Each character describes a physical or functional feature, although the final interpretation should be checked against the supplier’s technical catalog because detailed geometry can differ between product families.
| Code | General meaning | Buyer relevance |
|---|---|---|
| T | Triangular insert shape | Defines the cutting geometry and available corners |
| N | Nominally 0° clearance angle | Supports a strong negative-style cutting edge |
| M | Insert tolerance class | Identifies dimensional and manufacturing tolerance requirements |
| G | Hole and clamping or chip-control configuration | Must match the toolholder and clamping system |
| 16 | Nominal insert size | Commonly associated with a 9.525 mm inscribed circle |
| 04 | Nominal thickness designation | Commonly associated with approximately 4.76 mm thickness |
| 04 | Corner nose radius designation | Commonly indicates a 0.4 mm radius |
The letter “G” should not be treated as a universal guarantee of one specific chipbreaker design. In commercial catalogs, the same basic insert code may be offered with different chip-forming geometries, grades, coatings, and application ranges. For this reason, I recommend reviewing the complete part number and technical drawing rather than selecting an insert based only on the first four letters and numbers.
The most commonly referenced dimensions for TNMG 160404 are approximately 9.525 mm inscribed circle, 4.76 mm thickness, and 0.4 mm nose radius. These dimensions make the insert suitable for holders designed around the TNMG 16 size family. Depending on the standard and catalog, the clamping-hole dimension and detailed corner geometry may also be listed separately.
| Dimension | Typical value | Why it matters |
|---|---|---|
| Inscribed circle | Approximately 9.525 mm | Determines the general insert size and holder compatibility |
| Thickness | Approximately 4.76 mm | Influences seating and clamping requirements |
| Nose radius | 0.4 mm | Affects finish, cutting force, and profile capability |
| Included triangular angle | Approximately 60° | Supports turning, facing, and certain profiling operations |
These values are useful for initial identification, but they are not a substitute for a controlled drawing. Manufacturing tolerances, edge preparation, chipbreaker shape, coating thickness, and clamping-hole details can vary by supplier. Before buying in volume, I suggest comparing the insert drawing with the holder seat, screw or clamp system, tool orientation, and programmed nose-radius compensation.
The “N” geometry represents a 0° clearance category and is commonly associated with a negative-style insert arrangement. This design generally provides a robust cutting edge and can be effective in roughing, interrupted cuts, and general-purpose turning when the machine and workholding system are sufficiently rigid. The trade-off is that negative inserts can require more cutting power than positive inserts, especially when cutting depth, feed, or material strength increases.
A triangular insert provides multiple usable corners, which can help reduce tooling cost per cutting position. A double-sided TNMG design is generally associated with up to six indexing positions, subject to the exact insert geometry, chipbreaker, edge condition, and holder design. I advise operators to index the insert as soon as wear reaches the planned limit rather than continuing with a damaged corner that could affect surface quality or machine stability.
The 0.4 mm nose radius is a practical middle-ground option for many general turning tasks. It can support a better finish than a sharper 0.2 mm radius when the setup is stable, while producing lower cutting forces than a larger 0.8 mm radius under comparable conditions. The final result still depends on feed rate, workpiece material, tool rigidity, insert grade, coolant strategy, and the machine’s dynamic condition.
TNMG 160404 inserts are commonly considered for external turning, facing, shoulder work, and selected internal machining operations. In boring applications, the insert must be paired with a boring bar that provides adequate clearance, rigidity, and chip evacuation. At KEUE CNC, we evaluate the complete boring tool assembly rather than treating the insert as an isolated component.
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It is important not to assume that one TNMG 160404 grade works equally well across all these applications. Continuous steel turning, hardened material, cast iron, stainless steel, and aluminum may require different carbide substrates, coatings, edge preparations, or chipbreakers. The workpiece hardness, tensile behavior, surface scale, coolant condition, and machine power should guide the final selection.
The basic TNMG 160404 shape can be supplied in multiple carbide grades and chipbreaker designs. Coated carbide is often considered for general industrial turning because its performance can be adapted to different cutting materials and wear mechanisms, but coating selection should follow the workpiece and cutting range rather than a generic “best grade” claim.
When I help B2B buyers select TNMG 160404 inserts, I first confirm the holder and application. Check the holder designation, hand orientation, clamping method, approach angle, and available clearance before comparing grades. A correctly sized insert can still perform poorly if the pocket does not fully support the insert or if the toolholder is unsuitable for the intended cutting direction.
Next, define the cutting requirement in measurable terms. Record the workpiece material, hardness if known, diameter, cutting depth, feed rate, spindle speed, coolant use, and whether the cut is continuous or interrupted. For internal boring, also record the bore diameter and boring-bar overhang, because a slender bar can create vibration even when the insert geometry is appropriate.
Finally, compare more than unit price. Review dimensional consistency, edge preparation, coating and grade availability, packaging identification, sample approval, minimum order quantity, production lead time, and technical communication. At KEUE CNC, I can help buyers assess the insert together with compatible boring tools, turning holders, and application requirements instead of recommending a code without context.
As a manufacturer, supplier, and exporter of CNC cutting solutions, KEUE CNC focuses on practical compatibility and repeatable purchasing information. We can discuss TNMG 160404 insert dimensions, holder matching, material-based grade selection, chipbreaker requirements, and boring-tool integration. Where a buyer has an existing toolholder, we use its seat and clamping details as part of the selection process.
For a production inquiry, please prepare the target workpiece material, operation type, machine model or available power, insert code currently in use, required quantity, and any known cutting problem. Photographs of the holder seat, a technical drawing, or previous insert packaging can also help reduce specification errors. We can then clarify whether a standard TNMG 160404 configuration is suitable or whether another radius, grade, or geometry should be evaluated.
TNMG 160404 can be a suitable choice when you need a robust triangular insert for general CNC turning or compatible boring work, especially where a 0.4 mm nose radius and negative-style edge are appropriate. Its commonly referenced 9.525 mm size and 4.76 mm thickness help identify the correct holder family, but the exact drawing and clamping details must be verified. The correct chipbreaker and carbide grade depend on the workpiece and cutting conditions.
For the next step, confirm your holder designation, workpiece material, operation type, bore or turning dimensions, and current cutting parameters. Send these details to KEUE CNC for a practical compatibility review and sourcing quotation. We can help you evaluate the insert, holder, and boring-tool configuration as one complete B2B machining solution.
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