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Description
TNMX 240408 turning insert – indexable 60° triangle
| Technical data | |
|---|---|
| Side length l | 24 mm |
| Insert thickness s | 4.76 mm |
| Corner radius rε | 0.8 mm |
| Inscribed circle diameter IC | 13.86 mm |
S20 carbide indexable insert – applications and design
double-sided 60° triangle, uncoated carbide for steel and cast steel
The TNMX 240408 turning insert is a double-sided, triangular indexable insert made of cemented carbide in grade S20 from the Polish company Baildonit. Shape T denotes an equilateral triangle with a corner angle of 60°, providing easier access to the workpiece profile during longitudinal turning and facing. The negative geometry with a clearance angle of 0° allows both sides of the insert to be used, providing a total of six cutting edges. Grade S20 is an uncoated cemented carbide designed for machining steel, cast steel, and low-alloy cast steel. The triangular shape combines three cutting edges per side with reasonable corner strength.
Key features of the S20 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.
- Uncoated grade S20 — cemented carbide for finishing and semi-finishing steel, cast steel, and low-alloy cast steel, and, according to the grade specifications, also malleable cast iron.
- Corner radius rε 0.8 mm — a versatile compromise between surface finish and corner strength at moderate feed rates.
- Tolerance class M ensures repeatable edge positioning after indexing the insert in the holder pocket.
- The thickness of 4.76 mm and side length of 24 mm (IC 13.86 mm) fit holders with a size 24 triangular pocket.
- A corner angle of 60° produces lower radial forces than a 80° corner, reducing vibration on slender workpieces.
Applications and parameter selection for the triangular insert
The fourth letter of the designation, X, denotes a manufacturer-specific type — a design outside the standard ISO 1832 types, so the geometry details should be confirmed in the Baildonit catalog data sheet. The insert has a central mounting hole and is seated in the holder pocket, secured by a screw or lever. Uncoated carbide S20 performs best at high cutting speeds and moderate feed rates in finishing and semi-finishing steel and cast steel. According to the grade specifications, it is also suitable for malleable cast iron in group K. The flat rake face and rigid seating in the pocket promote stable operation during longitudinal turning and facing.
The TNMX 240408 insert (also written without a space as tnmx240408) is suitable for turning shafts, bushings, and flanges made of structural steels, as well as steel castings. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft diameter of 80 mm at an example cutting speed Vc = 150 m/min, the result is approximately 597 rpm. Select the feed rate to suit the nose radius and setup rigidity to maintain chip control and surface finish. During continuous cutting, use coolant to reduce wear on the uncoated carbide cutting edge and extend tool life. Baildonit is a Polish manufacturer of carbide cutting inserts with an established position in the cutting tool market.
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Application limitation
Grade S20 is uncoated, so it has lower wear resistance and a shorter tool life at high speeds than coated inserts. For long production runs and difficult-to-machine materials, consider an insert with a coating PVD or CVD.
Triangular insert designation decoder according to ISO 1832
how to read the TNMX 240408 code — positions 1–7 of the designation
Designation TNMX 240408 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 240408 insert
materials, nose radius, and holder selection
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.
Uncoated carbide S20 is intended for finishing and semi-finishing steel, cast steel and low-alloy cast steel at high cutting speeds and moderate feed rates. According to the grade data, it also performs well when turning malleable cast iron in group K.
Only in corner radius: 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 at higher feed rates. The remaining dimensions (IC 13.86 mm, thickness 4.76 mm) are identical.
Tool holders with an insert pocket of triangular shape and size 24 (IC 13.86 mm) and clamping through the center hole. Because X is a special type, verify the exact pocket, screw and shim dimensions against the tool holder manufacturer's table before ordering.
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| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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