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Description
TNMG 220408 turning insert – indexable 60° triangle
| Technical data | |
|---|---|
| Side length l | 22 mm |
| Insert thickness s | 4.76 mm |
| Hole diameter d1 | 5.16 mm |
| Corner radius rε | 0.8 mm |
| ANSI code | TNMG 432 |
Cutting data for the TNMG insert for steel and stainless steel
finishing, semi-finishing, and roughing
| 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 | 250-350 | 0.1 | 0.25 | 180-270 | 0.2 | 1.5 | 170-220 | 0.4 | 2.5 |
| MStainless Steel | 125-260 | 0.1 | 0.25 | 100-220 | 0.2 | 1.5 | 80-200 | 0.4 | 2.5 |
Indexable insert made of US735 cemented carbide – applications and design
double-sided 60° triangle with a hole and chip breaker
The TNMG 220408 turning insert is a double-sided, triangular indexable insert made of Mitsubishi grade US735 cemented carbide. Shape T denotes an equilateral triangle with a 60° corner angle, providing easier 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 — a total of six cutting edges. Grade US735 is a general-purpose carbide designed primarily for machining stainless steel, and also used for structural steel and cast iron.
Key features of the TNMG 220408 turning insert
- Six cutting edges — 3 corners on each of the two sides reduce the cost per cutting edge compared with single-sided inserts.
- Grade US735 for stainless steel — general-purpose carbide from Mitsubishi, also suitable for structural steel and cast iron.
- Corner radius rε 0.8 mm — a balance between surface finish and cutting edge strength at feed rates of 0.2–0.4 mm/rev.
- Tolerance class M ensures repeatable edge positioning after indexing the insert in the holder pocket.
- Dimensions according to ISO 1832: edge length 22 mm, IC 12.7 mm (1/2″), thickness 4.76 mm — fit holders with a 22 pocket.
- A 60° corner angle produces lower radial forces than a 80° corner — less vibration on slender workpieces.
Insert design and chip control
The mounting hole with a double-sided chip breaker (type G per ISO 1832) controls chip flow and breaking during continuous turning. In austenitic stainless steel, which conducts heat poorly, this geometry helps remove long, ductile chips from the cutting zone. Continuous cooling with emulsion limits built-up edge and extends cutting edge life. Size 22, with an inscribed circle IC of 12.7 mm, withstands greater cutting forces than smaller inserts in the 16 series, making it suitable for heavier roughing passes. The insert is compatible with turning tool holders with a 22 triangular insert seat for external turning, as well as boring bars for internal machining.
Applications and parameter selection for the triangular insert
The TNMG 220408 insert (also written without a space as tnmg220408) is suitable for turning shafts, bushings, and flanges made of structural steels, as well as stainless steel components. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft diameter of 80 mm at Vc = 200 m/min, the result is approximately 796 rpm. When machining stainless steels, maintain a cutting speed of 80–260 m/min and a constant feed rate to limit work hardening of the layer being cut. The rε 0.8 mm nose radius is a general-purpose option — it combines a good surface finish with cutting edge strength at feed rates of 0.2–0.4 mm/rev. The large inscribed circle radius IC of 12.7 mm and thickness of 4.76 mm provide a rigid cutting edge for semi-finishing and roughing.
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Application limitation
Grade US735 is a carbide for materials of normal hardness — it is not intended for steels hardened above 45 HRC. For hard turning, choose the variant TNMG 220408 CBN with a cubic boron nitride cutting edge.
Triangular insert designation decoder according to ISO 1832
how to read the TNMG 220408 code — positions 1–7 of the designation
Designation TNMG 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.
Compatible turning tools
holders with a 22 triangular pocket — external and internal turning
TTJNR/L 2525 M2225×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
TTJNR/L 3232 P2232×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
TTJNR/L 4040 S2240×40 × 250 mmR right-hand
←L left-hand
→
←L left-hand
→
TTENN 2525 M2225×25 × 150 mmNeutral
↔
↔
TTENN 3232 P2232×32 × 170 mmNeutral
↔
↔
TTENN 4040 S2240×40 × 250 mmNeutral
↔
↔
TTGNR/L 2525 M2225×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
TTGNR/L 3232 P2232×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
TTGNR/L 4040 S2240×40 × 250 mmR right-hand
←L left-hand
→
←L left-hand
→
TTFNR/L 2525 M2225×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
TTFNR/L 3232 P2232×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
TTFNR/L 4040 S2240×40 × 250 mmR right-hand
←L left-hand
→
←L left-hand
→
MTJNR/L 2525 M2225×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
MTJNR/L 3232 P2232×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
MTJNR/L 4040 S2240×40 × 250 mmR right-hand
←L left-hand
→
←L left-hand
→
MTENN 2525 M2225×25 × 150 mmNeutral
↔
↔
MTENN 3232 P2232×32 × 170 mmNeutral
↔
↔
MTENN 4040 S2240×40 × 250 mmNeutral
↔
↔
S32T TTUNR/L-22ø32 × 300 mm | D min ≥40R right-hand
←L left-hand
→
←L left-hand
→
S40U TTUNR/L-22ø40 × 350 mm | D min ≥50R right-hand
←L left-hand
→
←L left-hand
→
S50V TTUNR/L-22ø50 × 400 mm | D min ≥63R right-hand
←L left-hand
→
←L left-hand
→
S32T MTUNR/L-22ø32 × 300 mm | D min ≥40R right-hand
←L left-hand
→
←L left-hand
→
S40U MTUNR/L-22ø40 × 350 mm | D min ≥50R right-hand
←L left-hand
→
←L left-hand
→
Frequently asked questions about the TNMG 220408 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 22 triangular pocket (IC 12.7 mm): for external turning TTJNR/L and MTJNR/L (entering angle 93°), TTFNR/L and TTGNR/L (90°) and neutral holders TTENN and MTENN (60°) with shank cross sections of 25×25–40×40 mm; for internal turning, boring bars S32T–S50V with the suffix TTUNR/L or MTUNR/L.
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 12.7 mm, thickness 4.76 mm) are identical.
Yes — grade US735 was designed primarily for machining stainless steel. Maintain a cutting speed of 80–260 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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