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Description
TNMM 160412 turning insert – indexable 60° triangle
| Technical data | |
|---|---|
| Side length l | 16.5 mm |
| Insert thickness s | 4.76 mm |
| Hole diameter d1 | 3.81 mm |
| Corner radius rε | 1.2 mm |
| Inscribed circle diameter IC | 9.525 mm |
| ANSI code | TNMM 333 |
NT25 cemented carbide indexable insert – applications and design
double-sided 60° triangle with a hole and a single-sided chip breaker
The TNMM 160412 turning insert is a double-sided, triangular indexable insert made of NT25 grade cemented carbide by the Polish company Baildonit. Shape T, 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 nose radius rε of 1.2 mm and single-sided chip breaker (type M according to ISO 1832) make this insert suitable for roughing and semi-finishing steel at higher feed rates.
Key advantages of the NT25 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.
- Baildonit NT25 carbide grade — intended for turning structural steels and cast steel, including under less favorable machining conditions.
- Corner radius rε 1.2 mm — a strong cutting edge for roughing and semi-finishing at greater depths of cut.
- The single-sided chip breaker (type M) aids chip control and breaking when turning steel.
- Dimensions comply with ISO 1832: edge length 16.5 mm, IC 9.525 mm (3/8″), thickness 4.76 mm — compatible with tool holders with a size 16 triangular 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 TNMM 160412 insert (also written without a space as tnmm160412) performs well when turning shafts, bushings and flanges made of structural steels and cast steel. Calculate the spindle speed using n = 1000·Vc/(π·D): for example, a shaft with a diameter of 80 mm at a cutting speed Vc = 200 m/min requires about 796 rpm. The larger nose radius of 1.2 mm increases cutting edge strength and allows deeper cuts, but increases radial forces — reducing tool overhang is advisable on slender workpieces. Grade NT25 is manufactured by Baildonit, Poland's oldest manufacturer of indexable inserts.
In high-volume machining, this cemented carbide insert provides a stable cutting edge and predictable wear, making it easier to schedule cutting edge changes on CNC and conventional lathes. The triangular shape with a 60° angle generates lower radial forces than inserts with a 80° or 90° corner, making it well suited to longitudinal turning of long shafts. With structural steel and cast steel, maintain a uniform feed rate and ample coolant flow to limit built-up edge and extend carbide tool life. For finish turning at lower feed rates, choose a version with a 0.8 or 0.4 mm radius from the same TNMM 1604 family.
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Application limitation
Grade NT25 is carbide for turning steel and cast steel; it is not intended for hardened steels above 45 HRC. For hard turning — turning inserts for hardened steel — choose a version with a cubic boron nitride cutting edge (CBN).
Triangular insert designation decoder according to ISO 1832
how to read the TNMM 160412 code — positions 1–7 of the designation
Designation TNMM 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 TNMM 160412 insert
number of cutting edges, radius selection and materials for turning
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 and greater depths of cut. The remaining dimensions (IC 9.525 mm, thickness 4.76 mm) are identical.
Baildonit's NT25 carbide grade is intended for turning steel structural and cast steel, including under less favorable machining conditions. Standard carbides are not suitable for hardened steels above 45 HRC — inserts with a CBN cutting edge are used for these applications.
The fourth letter of the ISO 1832 code (type) determines the difference: M is an insert with a hole and a chip breaker on one side, while G has a chip breaker on both sides. The shape, 60° corner angle, dimensions and clamping method in the tool holder remain the same.
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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