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Description
TNMG 220404 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 | 0.4 mm |
| ANSI code | TNMG 431 |
Cutting data for the TNMG 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 | 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 |
Grade H6310 cemented carbide indexable insert – applications and construction
double-sided 60° triangle with a hole and chip breaker
The TNMG 220404 turning insert is a double-sided, triangular indexable insert made of H6310 grade cemented carbide, designed for turning steel and stainless steel. Shape T, an equilateral triangle with a 60° corner angle, 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 — a total of six cutting edges. Size 22 corresponds to an inscribed circle IC of 12.7 mm (1/2 inch), so the insert is compatible with tool holders and boring bars with a size 22 triangular pocket. The nose radius rε 0.4 mm supports precision machining and finishing at low feeds, producing low surface roughness. The hole with a double-sided chip breaker (type G according to ISO 1832) controls chip flow and breaking.
Key advantages of the H6310 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 H6310 for ISO groups P and M — general-purpose PVD-coated carbide: steel (P20-P40) and stainless steel (M20-M40), and occasionally cast iron.
- Corner radius rε 0.4 mm — a smaller corner for precision machining and finishing at low feeds with a good surface finish.
- Tolerance class M, with an inscribed circle IC tolerance of ±0.08 mm, ensures repeatable cutting edge positioning after indexing the insert in its 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.
Applications and parameter selection for the triangular insert
The TNMG 220404 insert (also written without a space as tnmg220404) is suitable for finish turning shafts, bushings, and flanges made of structural steels, as well as stainless steel components. These inserts are used for external and internal turning and are mounted in holders with a triangular 22 pocket. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft diameter of 50 mm at Vc = 300 m/min, the result is approximately 1910 rpm. The smaller nose radius of 0.4 mm works best at feed rates of 0.1–0.2 mm/rev in finishing operations where dimensional accuracy and surface finish are critical. At greater depths of cut, the insert can also handle semi-finishing, although the small nose radius limits the maximum feed rate. For stainless steels, maintain a cutting speed of 80–260 m/min and a constant feed rate to prevent work hardening of the material being cut. Flood cooling with emulsion removes heat from the cutting edge and extends its life. Indexable inserts in grade H6310 are supplied by the Korean brand Horn.
▲
Application limitation
Grade H6310 is not intended for steels hardened above 45 HRC — for hard turning, select the version TNMG 220404 CBN with a cubic boron nitride cutting edge.
Triangular insert designation decoder according to ISO 1832
how to read the TNMG 220404 code — positions 1–7 of the designation
Designation TNMG 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.
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
→
S50V MTUNR/L-22ø50 × 400 mm | D min ≥63R right-hand
←L left-hand
→
←L left-hand
→
S32T MTQNR/L-22ø32 × 300 mm | D min ≥40R right-hand
←L left-hand
→
←L left-hand
→
S40U MTQNR/L-22ø40 × 350 mm | D min ≥50R right-hand
←L left-hand
→
←L left-hand
→
S50V MTQNR/L-22ø50 × 400 mm | D min ≥63R right-hand
←L left-hand
→
←L left-hand
→
Frequently asked questions about the TNMG 220404 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 cross sections of 25×25–40×40 mm; for internal turning, the inserts fit boring bars S32T–S50V with a TTUNR/L, MTUNR/L or MTQNR/L designation suffix.
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 feed rates up to 0.4–0.5 mm/rev. The other dimensions (IC 12.7 mm, thickness 4.76 mm) are identical.
Yes — grade H6310 covers group ISO M20-M40. 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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| 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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