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Description
TNMG 160404 turning insert – indexable 60° triangle
| Technical data | |
|---|---|
| Side length l | 16.5 mm |
| Insert thickness s | 4.76 mm |
| Hole diameter d1 | 3.81 mm |
| Corner radius rε | 0.4 mm |
| ANSI code | TNMG 331 |
Cutting data for the TNMG 160404 insert for steel and stainless steel
finishing, semi-finishing and roughing — ISO P and M groups
| Material | Finishing | Semi-finishing | Roughing | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Vc [m/min] | Feed f [mm/rev] | ap [mm] | Vc [m/min] | Feed f [mm/rev] | ap [mm] | Vc [m/min] | Feed f [mm/rev] | ap [mm] | |
| PSteel | 200-295 | 0.12 | 1 | 170-240 | 0.15 | 2.5 | 150-215 | 0.3 | 3.5 |
| MStainless steel | 110-230 | 0.12 | 1 | 70-175 | 0.15 | 2.5 | 50-135 | 0.3 | 3.5 |
AE9025 cemented carbide indexable insert – applications and design
double-sided 60° triangle with a hole and chip breaker, radius 0.4 mm
The TNMG 160404 turning insert is a double-sided, triangular indexable insert made of grade AE9025 cemented carbide, designed for turning steel and stainless steel. Shape T denotes an equilateral triangle with a 60° corner angle, which facilitates access to the workpiece contour during longitudinal turning and facing. The negative geometry with a 0° clearance angle allows both sides of the insert to be used, providing a total of six cutting edges. The mounting hole with a type G chip breaker according to ISO 1832 controls chip flow and breaking on both sides of the insert.
Key benefits of the AE9025 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 AE9025 with CVD coating — cemented carbide for turning steels in ISO group P30 and, with the R-S geometry, stainless steel.
- Corner radius rε 0.4 mm — a finishing configuration for precision turning at low feed rates and a high-quality surface finish.
- Tolerance class M provides repeatable cutting edge positioning after indexing the insert in its seat (inscribed circle IC ±0.05 mm).
- Dimensions according to ISO 1832: edge length 16.5 mm, IC 9.525 mm (3/8″), thickness 4.76 mm — fit holders with a 16 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
Grade AE9025 is a CVD-coated cemented carbide designed for turning steels in ISO group P30 and, thanks to the R-S geometry, stainless steel. The CVD coating increases the cutting edge's resistance to abrasive wear and stabilizes performance during continuous turning at higher cutting speeds. The small corner radius rε of 0.4 mm is a finishing configuration that provides low cutting forces and a smooth surface at low feed rates. Tolerance class M ensures repeatable cutting edge positioning each time the insert is indexed in the holder seat, while screw clamping through the hole reduces insert replacement time.
The TNMG 160404 insert (also written without a space as tnmg160404) is suitable for finishing shafts, bushings, and flanges made of structural steels, as well as stainless steel components. Calculate spindle speed using the formula n = 1000·Vc/(π·D): for a shaft diameter of 40 mm at Vc = 250 m/min, the result is approximately 1989 rpm. Selecting a feed rate within the 0.12 mm/rev range maintains a high-quality finished surface and protects the delicate corner from overload. For stainless steel, maintain a cutting speed within the 50–230 m/min range and a constant feed rate to reduce work hardening of the layer being cut. Six cutting edges reduce the cost per edge, and indexable inserts in grade AE9025 are supplied by the Korean brand Horn.
▲
Application limitation
Grade AE9025 (CVD-coated carbide) is not intended for hardened steels above 45 HRC — for turning hardened steel, select an insert version with an edge CBN made of cubic boron nitride. The radius rε 0.4 mm is intended for finishing; for roughing, select a version with a larger corner radius.
Triangular insert designation decoder according to ISO 1832
how to read the TNMG 160404 code — positions 1–7 of the designation
Designation TNMG 160404 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.
Compatible turning tools
holders with a 16 triangular pocket — external and internal turning
TTJNR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
TTJNR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
TTJNR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
TTENN 2020 K1620×20 × 125 mmNeutral
↔
↔
TTENN 2525 M1625×25 × 150 mmNeutral
↔
↔
TTENN 3232 P1632×32 × 170 mmNeutral
↔
↔
TTGNR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
TTGNR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
TTGNR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
TTFNR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
TTFNR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
TTFNR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
MTJNR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
MTJNR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
MTJNR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
MTENN 2020 K1620×20 × 125 mmNeutral
↔
↔
MTENN 2525 M1625×25 × 150 mmNeutral
↔
↔
MTENN 3232 P1632×32 × 170 mmNeutral
↔
↔
S25S TTUNR/L-16ø25 × 250 mm | D min ≥32R right-hand
←L left-hand
→
←L left-hand
→
S32T TTUNR/L-16ø32 × 300 mm | D min ≥40R right-hand
←L left-hand
→
←L left-hand
→
S25S TT-NR/L-16ø25 × 250 mm | D min ≥32R right-hand
←L left-hand
→
←L left-hand
→
S32T TT-NR/L-16ø32 × 300 mm | D min ≥40R right-hand
←L left-hand
→
←L left-hand
→
S20R MTUNR/L-16ø20 × 200 mm | D min ≥25R right-hand
←L left-hand
→
←L left-hand
→
S25S MTUNR/L-16ø25 × 250 mm | D min ≥32R right-hand
←L left-hand
→
←L left-hand
→
S32T MTUNR/L-16ø32 × 300 mm | D min ≥40R right-hand
←L left-hand
→
←L left-hand
→
S40U MTUNR/L-16ø40 × 350 mm | D min ≥50R right-hand
←L left-hand
→
←L left-hand
→
S20R MTQNR/L-16ø20 × 200 mm | D min ≥25R right-hand
←L left-hand
→
←L left-hand
→
S25S MTQNR/L-16ø25 × 250 mm | D min ≥32R right-hand
←L left-hand
→
←L left-hand
→
S32T MTQNR/L-16ø32 × 300 mm | D min ≥40R right-hand
←L left-hand
→
←L left-hand
→
S40U MTQNR/L-16ø40 × 350 mm | D min ≥50R right-hand
←L left-hand
→
←L left-hand
→
Frequently asked questions about the TNMG 160404 insert
use, turning tool selection, and turning parameters
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.
Holders with a 16 triangular pocket (IC 9.525 mm): for external turning TTJNR/L and MTJNR/L (entering angle 93°), TTFNR/L and TTGNR/L (90°) and TTENN and MTENN (60°) with shank cross sections of 20×20–32×32 mm; for internal turning, boring bars S20R–S40U with a TTUNR/L, MTUNR/L or MTQNR/L designation suffix.
Only in corner radius: 0.4 mm on the TNMG 160404 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 9.525 mm, thickness 4.76 mm) are identical.
Yes — CVD-coated grade AE9025 covers stainless steel turning (ISO group M). Maintain a cutting speed of 50–230 m/min, a constant feed, and continuous emulsion cooling: austenitic steel conducts heat poorly and work-hardens when cutting is too slow.
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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