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Description
TNMG 220412 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 | 1.2 mm |
| ANSI code | TNMG 433 |
Cutting data for the TNMG 220412 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 | 0.15 | 0.5 | 180-270 | 0.25 | 2 | 170-220 | 0.5 | 3 |
| MStainless steel | 125-260 | 0.15 | 0.5 | 100-220 | 0.25 | 2 | 80-200 | 0.5 | 3 |
Grade H6310 cemented carbide indexable insert – applications and construction
double-sided 60° triangle with a hole and chip breaker
The TNMG 220412 turning insert is a double-sided, triangular indexable insert made of grade H6310 cemented carbide, designed for turning steel and stainless steel. The T shape, an equilateral triangle with a 60° corner angle, 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. The large nose radius rε of 1.2 mm strengthens the corner and favors roughing at higher feeds. The hole with a chip breaker on both sides (type G according to ISO 1832) controls chip flow and breaking.
Grade H6310 is PVD-coated cemented carbide classified in ISO groups P20-P40 and M20-M40. The coating increases edge resistance to wear and high temperatures, allowing one insert to cover both structural steel and more demanding stainless steel. Tolerance class M ensures repeatable corner positioning after indexing the insert in the pocket. The main dimensions according to ISO 1832 are an edge length of 22 mm, an inscribed circle IC of 12.7 mm (1/2 inch), and a thickness of 4.76 mm, matching tool holders with a size 22 triangular pocket.
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 1.2 mm — a large corner for roughing and semi-finishing at feeds up to 0.5 mm/rev.
- Tolerance class M provides repeatable cutting 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.
Applications and parameter selection for the triangular insert
The TNMG 220412 insert (also written without a space as tnmg220412) is suitable for roughing and semi-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 with a diameter of 80 mm at Vc = 250 m/min, the result is approximately 995 rpm. The larger nose radius of 1.2 mm distributes the load over a longer cutting edge, allowing the insert to withstand depths of cut up to 3 mm and feeds up to 0.5 mm/rev. When machining stainless steels, maintain a cutting speed of 80–260 m/min and a constant feed to avoid work hardening of the layer being cut. 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 220412 CBN with a cubic boron nitride cutting edge.
Triangular insert designation decoder according to ISO 1832
how to read the TNMG 220412 code — positions 1–7 of the designation
Designation TNMG 220412 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 220412 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 a TTUNR/L, MTUNR/L or MTQNR/L designation suffix.
Only in corner radius: 0.8 mm is the general-purpose version, 1.2 mm strengthens the corner for roughing and semi-finishing at feeds up to 0.5 mm/rev, while 1.6 mm withstands even higher feeds. The remaining 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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Shipping
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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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