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Description
TNMX 220408 turning insert – indexable 60° triangle
| Technical data | |
|---|---|
| Side length l | 22 mm |
| Insert thickness s | 4.76 mm |
| Inscribed circle diameter IC | 12.7 mm |
| Corner radius rε | 0.8 mm |
| ANSI code | TNMX 432 |
U10 carbide indexable insert – applications and design
double-sided 60° triangle, Baildonit grade for cast iron and nonferrous metals
The TNMX 220408 turning insert is a double-sided, triangular indexable insert made of U10 grade cemented carbide by the Polish company Baildonit. Shape T denotes an equilateral triangle with a 60° corner angle, which facilitates access to the workpiece contour during longitudinal turning and facing. Negative geometry with a 0° clearance angle allows both sides of the insert to be used — a total of six cutting edges. Grade U10 covers finishing and semi-finishing of cast irons, alloy and austenitic steels, as well as nonferrous alloys and nonmetallic materials that produce short chips.
Key advantages of the U10 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 U10 for short-chipping materials — carbide for cast irons, alloy and austenitic steels, as well as nonferrous alloys and plastics.
- Corner radius rε 0.8 mm — a versatile option for finishing and semi-finishing, without changing the insert between passes.
- Tolerance class M ensures repeatable cutting edge positioning after indexing the insert in the tool holder pocket.
- The large IC of 12.7 mm (l 22 mm) and thickness of 4.76 mm provide a rigid cutting edge resistant to breakage for heavier passes.
- 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 220408 insert (also written without a space as tnmx220408) performs well when turning shafts, discs and bushings made of gray and ductile cast iron, alloy steel components, and bronze, brass and aluminum workpieces. This cemented carbide insert performs well where the material produces short, brittle chips. The large IC of 12.7 mm and thickness of 4.76 mm provide a rigid cutting edge for heavier passes, while the nose radius rε of 0.8 mm combines a good surface finish with edge strength at medium feed rates. The letter X in the designation indicates a special type defined by the manufacturer, outside the standard set of features covered by ISO 1832.
Calculate the spindle speed using n = 1000·Vc/(π·D). For a shaft with a diameter D = 50 mm at an illustrative, approximate speed Vc = 120 m/min, the result is about 764 rpm; select the exact cutting speed according to the workpiece material and the manufacturer's data sheet. Uncoated carbide performs best at moderate speeds and a constant feed rate, which limits heat buildup and edge chipping. With austenitic steels, maintain continuous feed and coolant flow to prevent work hardening of the layer being cut. These turning tool inserts can be indexed when a corner becomes dull without removing the tool holder from the tool post.
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Application limitation
Grade U10 is uncoated carbide — a coated grade is better for long production runs in steel at high speeds, and for turning hardened steels above 45 HRC choose a version with a cutting edge CBN made of cubic boron nitride.
Triangular insert designation decoder according to ISO 1832
how to read the TNMX 220408 code — positions 1–7 of the designation
Designation TNMX 220408 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 220408 insert
number of cutting edges, materials for grade U10 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 an edge becomes dull, simply rotate the insert in its pocket without changing the holder.
Grade U10 is intended for finishing and semi-finishing of all grades of cast irons, alloy and austenitic steels as well as nonferrous alloys and nonmetallic materials that produce short chips. This is uncoated carbide, so it performs best at moderate cutting speeds.
Only in the nose radius rε: 0.4 mm is used for finishing at low feed rates, 0.8 mm is the general-purpose version, and 1.2 mm is selected for roughing. The remaining dimensions (IC 12.7 mm, side length 22 mm, thickness 4.76 mm) are identical throughout the family.
The fourth letter X indicates a special type defined by the manufacturer — the insert design falls outside the standard set of features covered by ISO 1832. The remaining code positions (60° triangle, 0° clearance angle, tolerance class M, dimensions) are read from the designation as usual.
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