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Description
TNMG 220412 turning insert – indexable 60° triangle
| Technical data | |
|---|---|
| Side length l | 22.0 mm |
| Insert thickness s | 4.76 mm |
| Hole diameter d1 | 5.16 mm |
| Corner radius rε | 1.2 mm |
| Inscribed circle IC | 12.7 mm |
| ANSI code | TNMG 433 |
S30s carbide indexable insert – applications and design
double-sided 60° triangle with a hole and chip breaker
The TNMG 220412 turning insert is a double-sided, triangular indexable insert made of cemented carbide in grade S30s by Baildonit, designed for turning steel and cast steel. Shape T, an equilateral triangle with a 60° corner angle, provides easier 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 corner radius rε of 1.2 mm increases edge strength and favors higher feeds in semi-finishing and roughing. The hole and double-sided chip breaker (type G according to ISO 1832) control chip flow and breaking.
Key benefits of the S30s 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 S30s for ISO P materials — cemented carbide for structural steels, alloy steels, and cast steel (application range P25-P35), for finishing and semi-finishing.
- Corner radius rε 1.2 mm — greater edge strength and the ability to run at higher feed rates in roughing operations.
- Tolerance class M ensures repeatable cutting edge positioning after indexing the insert in its seat, with an inscribed circle IC tolerance of ±0.08 mm.
- Dimensions conform to ISO 1832: edge length 22 mm, IC 12.7 mm (1/2″), thickness 4.76 mm — compatible with holders with a size 22 triangular insert seat.
- 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 S30s is a cemented carbide designed for ISO P materials, including structural steels, alloy steels, and cast steel. The manufacturer places it in the P25-P35 application range, for high-productivity finishing and semi-finishing at elevated cutting speeds. Enhanced abrasion resistance helps maintain the cutting edge under demanding thermal conditions when high temperatures develop in the cutting zone. The indexable design with six corners reduces the cost per edge, since a dull insert can simply be indexed in the holder seat without replacement.
The TNMG 220412 insert (also written without a space as tnmg220412) is suitable for turning shafts, bushings, and flanges made of structural steels and cast steel. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft diameter of 80 mm at an example cutting speed of Vc = 200 m/min, the result is approximately 796 rpm. Select the actual speed according to the workpiece material grade and setup rigidity, and verify the exact values in the manufacturer's machining data sheet. The larger nose radius of 1.2 mm distributes the load over a longer section of the cutting edge, allowing the insert to withstand feed rates typical of roughing. Indexable inserts in grade S30s are supplied by the Polish company Baildonit.
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Application limitation
Grade S30s belongs to ISO group P (steel and cast steel) — it is not intended for austenitic stainless steel (group M) or steels hardened above 45 HRC. For turning hardened steel, choose a turning insert with a cubic boron nitride cutting edge CBN.
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.
Frequently asked questions about the TNMG 220412 insert
number of cutting edges, material selection, and nose radius
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.
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, side length 22 mm, thickness 4.76 mm) are identical.
Grade S30s is a carbide in group ISO P, intended for structural steels, alloy steels, and cast steel. For austenitic stainless steel, it is better to select an insert grade from group M; using a P grade on stainless steel reduces cutting edge life.
Yes — the nose radius 1.2 mm strengthens the cutting edge and distributes the load over a longer section of the edge, enabling the insert to withstand higher feed rates. The 4.76 mm thickness and six cutting edges support high-productivity finishing and semi-finishing of steel and cast steel.
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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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