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Description
TNMA 160412 turning insert – 60° indexable triangle
| Technical data | |
|---|---|
| Side length l | 16.5 mm |
| Insert thickness s | 4.76 mm |
| Corner radius rε | 1.2 mm |
| ANSI code | TNMA 333 |
| Inscribed circle IC | 9.525 mm (3/8″) |
NTH2 carbide indexable insert – applications and design
double-sided 60° triangle with a hole, flat without a chip breaker
The TNMA 160412 turning insert is a double-sided, triangular indexable insert made from Baildonit grade NTH2 cemented carbide, primarily intended for turning cast iron. Shape T, an equilateral triangle with a 60° corner angle, facilitates access to the workpiece profile 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. The letter A in the designation denotes an insert with a hole but without a molded chip breaker: the rake face is flat. Negative inserts of this type require rigid clamping and greater spindle power, but are strong and economical to use.
Key features of the NTH2 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 NTH2 for ISO groups K and M — carbide for semi-finishing and roughing gray and malleable cast iron, as well as alloy and austenitic steels that produce short chips.
- Large corner radius rε 1.2 mm — the reinforced tip withstands higher feed rates and the interrupted cuts typical of rough turning.
- Flat rake face without a molded chip breaker (type A according to ISO 1832) — the short, brittle chips produced by cast iron break on their own, without an additional groove.
- Tolerance class M, with an inscribed circle IC tolerance of ±0.05 mm, provides repeatable edge positioning after indexing the insert in the holder pocket.
- Dimensions conforming to ISO 1832: side length 16.5 mm, IC 9.525 mm (3/8″), thickness 4.76 mm — compatible with holders with size 16 triangular pockets.
Applications and parameter selection for the triangular insert
The TNMA 160412 insert (also written without a space as tnma160412) is suitable for turning housings, bushings, pulleys, and flanges made of gray and malleable cast iron, as well as short-chipping alloy steels. This cemented carbide indexable insert is sometimes selected as a replacement for TNMG inserts where a chip breaker is not needed. Gray cast iron is an abrasive material — graphite and hard pearlite inclusions wear the edge, so carbide with good wear resistance extends cutting edge life. Cast iron is usually turned dry or with an air blast, which reduces thermal shock during interrupted cutting through the casting skin. Calculate spindle speed using n = 1000·Vc/(π·D): for a workpiece with a diameter of 50 mm, assuming an example Vc = 150 m/min for gray cast iron, the result is approximately 955 rpm. The large nose radius of 1.2 mm allows the feed rate to be increased without sacrificing tip strength, so this cutting insert withstands roughing and interrupted cuts well, such as turning castings with cored holes and a hard casting skin. Grade NTH2 turning inserts are supplied by the Polish brand Baildonit.
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Application limitation
The flat geometry of type A does not control the long, ductile chips produced by low-carbon steels turned at low feed rates — for these materials, choose an insert with a molded chip breaker (e.g., a version TNMG) or a holder with a chip-breaking attachment.
Triangular insert designation decoder according to ISO 1832
how to read the TNMA 160412 code — positions 1–7 of the designation
Designation TNMA 160412 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 TNMA 160412 insert
handling, design, 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.
No — the letter A in the ISO 1832 designation denotes an insert with a hole but with a flat rake face, without a molded chip breaker. A chip breaker is not needed when turning cast iron because the material produces short, brittle chips that break on their own.
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 and interrupted cutting. The other dimensions (IC 9.525 mm, thickness 4.76 mm) are identical.
Carbide grade NTH2 is primarily intended for semi-finishing and roughing gray and malleable cast iron (group ISO K), as well as alloy and austenitic steels that produce short chips (group ISO M). For long-chipping low-carbon steel, an insert with a chip breaker is a better choice.
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