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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 |
| Corner radius rε | 0.4 mm |
| Inscribed circle diameter IC | 12.7 mm |
| ANSI code | TNMX 431 |
TCH2 cemented carbide indexable insert – applications and design
double-sided 60° triangle for semi-finishing cast iron
The TNMX 220404 turning insert is a double-sided, triangular indexable insert made from Baildonit grade TCH2 cemented carbide. Shape T denotes an equilateral triangle with a 60° corner angle, facilitating longitudinal turning and facing with a single tool setup. The negative geometry with a 0° clearance angle allows both sides of the insert to be used, providing a total of six cutting edges. Its nose radius rε of 0.4 mm and thickness s of 4.76 mm make it suitable for semi-finishing cast iron.
The letter X in the fourth position of the designation denotes a manufacturer-specific special type — the insert design falls outside the standard catalog variants defined by ISO 1832. Grade TCH2 cemented carbide combines wear resistance with edge strength, enabling the insert to withstand heavy and interrupted cutting conditions. The inscribed circle diameter IC of 12.7 mm matches size 22 holder pockets, and the triangle side length is 22 mm.
Key features of the TCH2 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.
- Grade TCH2 for cast iron — Baildonit cemented carbide for semi-finishing and roughing iron castings.
- Corner radius rε 0.4 mm — the small radius favors finer machining and lower cutting forces at moderate feed rates.
- The negative, double-sided geometry with a 0° clearance angle provides a strong, chip-resistant corner.
- Tolerance class M provides repeatable cutting edge positioning after indexing the insert in the holder pocket.
- A 60° corner angle produces lower radial forces than a 80° corner — less vibration on slender workpieces.
Applications and parameter selection for the triangular insert
The TNMX 220404 insert (also written without a space as tnmx220404) is suitable for turning iron castings such as housings, pulleys, and bushings, including interrupted cutting conditions. Baildonit grade TCH2 is designed for semi-finishing and roughing cast iron at moderate cutting speeds and medium to high feed rates. In addition to cast iron, it is also suitable for machining copper alloys, light alloys, heat-resistant materials, and plastics. Six cutting edges per insert reduce the cost per edge in series production.
Calculate spindle speed using n = 1000·Vc/(π·D). For a casting with a diameter of 80 mm and an example cutting speed of Vc = 120 m/min, the result is approximately 477 rpm. Select the speed to suit the cast iron hardness and setup rigidity, and maintain a constant feed rate during interrupted cutting to protect the insert corner. Rigid workpiece clamping and continuous cooling reduce vibration and extend cutting edge life. Baildonit is a Polish manufacturer of carbide cutting inserts.
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Application limitation
A small nose radius rε 0.4 mm limits the permissible feed rate and depth of cut — the corner is susceptible to chipping during heavier roughing. For large machining allowances, 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, grade TCH2, and ISO designation
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 a cutting edge becomes dull, simply index the insert in the tool holder pocket without replacing it.
Grade TCH2 from Baildonit is primarily intended for semi-finishing and roughing cast iron at moderate cutting speeds and medium or high feed rates. It is also suitable for turning copper alloys, light alloys, heat-resistant materials, and plastics.
Mainly in the nose radius rε. The version 0.4 mm, as in TNMX 220404, is used for finer machining at lower feed rates, while larger radii are selected for heavier roughing. The other dimensions — IC 12.7 mm and thickness of 4.76 mm — remain the same.
The fourth position of the designation according to ISO 1832 describes the design type. The letter X denotes a manufacturer-specific special type — the insert features fall outside the standard variants defined by the standard. The other fields are read as usual: T denotes a 60° triangle, N a 0° clearance angle, and M the tolerance class.
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