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Description
TNMX 220404 turning insert – indexable 60° triangle
| Technical data | |
|---|---|
| Side length l | 22.0 mm |
| Insert thickness s | 4.76 mm |
| Inscribed circle diameter IC | 12.7 mm |
| Corner radius rε | 0.4 mm |
| ANSI code | TNMX 431 |
TNH20 carbide indexable insert – applications and design
60° triangle, negative and double-sided — finishing
The TNMX 220404 turning insert is a triangular indexable insert made from Baildonit grade TNH20 cemented carbide. Shape T, an equilateral triangle with a 60° corner angle, facilitates access to the workpiece profile during longitudinal turning and facing. The negative design with a 0° clearance angle allows both sides of the insert to be used — a total of six cutting edges. The small nose radius rε of 0.4 mm makes this cutting insert a finishing and semi-finishing option that produces a smooth surface at moderate feed rates.
Key features of the TNH20 cemented carbide insert
- Six cutting edges — 3 corners on each of the two sides reduce the cost per cutting edge compared with single-sided inserts.
- Cemented carbide grade TNH20 — for finishing and semi-finishing cast irons, alloy and austenitic steels, and nonferrous alloys.
- Corner radius rε 0.4 mm — the small finishing radius produces a smooth surface and low cutting forces on slender workpieces.
- The mounting hole in the center of the insert allows secure seating in the holder pocket and quick indexing when a corner wears out.
- Tolerance class M provides repeatable edge positioning after indexing the insert in the pocket, without dimensional corrections between cutting edges.
- A 60° corner angle produces lower radial forces than a 80° corner — less vibration when turning shafts.
Applications and parameter selection for the triangular insert
The TNMX 220404 insert (also written without a space as tnmx220404) is suitable for finish turning cast irons, alloy and austenitic steels, and nonferrous alloys — materials that produce short chips that are easy to evacuate. It is an insert for external turning tools and boring bars with a triangular pocket of the appropriate size. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft with a diameter of 50 mm at an example cutting speed of Vc = 150 m/min, the result is approximately 955 rpm. With such a small nose radius, keep the feed rate matched to the required surface finish and control the depth of cut to avoid overloading the edge.
Cemented carbide grade TNH20 combines the hardness required for cutting with resistance to mechanical loads, enabling the insert to withstand varying operating conditions and minor impacts at the edge. The triangular shape with a 60° corner angle generates lower radial forces than inserts with a larger angle, making it more suitable for slender workpieces where vibration reduction matters. The insert belongs to the TNMX 2204 family, whose variants differ primarily in nose radius and suitability for specific turning operations. This turning insert is manufactured by the Polish company Baildonit.
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Application limitation
Corner radius rε 0.4 mm is a finishing version. An excessive feed rate or depth of cut for such a small corner can cause edge chipping — for roughing, choose a version from the family TNMX 2204 with a larger nose radius.
Triangular insert designation decoder according to ISO 1832
how to read the TNMX 220404 code — positions 1–7 of the designation
Designation TNMX 220404 according to the standard ISO 1832: 4 letters describe geometry and construction, 3 numeric codes describe dimensions. Each field has a number, an icon, and a brief description.
Frequently asked questions about the TNMX 220404 insert
number of cutting edges, materials, and differences within the family
Six — the triangle has 3 corners per side, and the negative geometry (0° clearance angle) allows both sides of the insert to be used. Once an edge becomes dull, simply rotate the insert in its pocket without changing the holder.
Grade TNH20 is intended for finishing and semi-finishing cast irons, alloy and austenitic steels as well as nonferrous alloys and nonmetallic materials that produce short chips. It performs best in finishing operations.
Primarily in the nose radius. The radius 0.4 mm is a finishing option for low feed rates and a smooth surface; versions with larger radii in the same family are better suited to heavier roughing operations. The other overall dimensions (IC 12.7 mm, thickness 4.76 mm) are shared.
The fourth letter of the designation according to ISO 1832 describes the insert design type. The letter X denotes a special type — a design with manufacturer-defined features that fall outside the standard ISO catalog variants. The other code fields (T, N, M) are read in the same way as for other turning inserts.
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