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Description
TPUN 160308 turning insert – indexable 60° triangle
| Technical data | |
|---|---|
| Side length l | 16.5 mm |
| Insert thickness s | 3.18 mm |
| Corner radius rε | 0.8 mm |
| ANSI code | TPUN 322 |
Cutting data for the TPUN 160308 insert for steel and stainless steel
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 | 200-295 | 0.15 | 1 | 170-240 | 0.3 | 3.5 | 150-215 | 0.4 | 5 |
| MStainless steel | 110-230 | 0.15 | 1 | 70-175 | 0.3 | 3.5 | 50-135 | 0.4 | 5 |
Grade H6018 cemented carbide indexable insert – applications and construction
single-sided 60° triangle without a hole or chip breaker
The TPUN 160308 turning insert is a single-sided triangular indexable insert made of grade H6018 cemented carbide, designed for turning steel, cast steel, and stainless steel. Shape T denotes an equilateral triangle with a 60° corner angle, providing easier access to the contour during longitudinal turning and facing. Positive geometry with a 11° clearance angle reduces cutting forces, so the insert cuts on one side and provides three cutting edges. The nose radius rε of 0.8 mm combines a good surface finish with edge strength at feeds of 0.15–0.4 mm/rev.
Key advantages of the H6018 cemented carbide insert
- Three cutting edges — the single-sided triangle provides 3 corners of 60° each; once an edge becomes dull, simply rotate the insert in its pocket instead of replacing the entire tool holder.
- Grade H6018 for ISO groups P and M — general-purpose coated carbide for steel (P20-P40) and stainless steel (M20-M40), and occasionally cast iron.
- Corner radius rε 0.8 mm — a general-purpose version for semi-finishing and roughing without changing the insert between operations.
- Positive geometry with a 11° clearance angle reduces cutting forces, making it suitable for more slender and less rigid workpieces.
- Type N without a hole, secured with a top clamp — full edge support at large uncut chip cross sections.
- Dimensions comply with ISO 1832: IC 9.525 mm (3/8″), edge length 16.5 mm, thickness 3.18 mm — compatible with tool holders with a 16 triangular pocket.
Applications and parameter selection for the triangular insert
The TPUN 160308 insert (also written without a space as tpun160308) is suitable for rough turning and semi-finishing of shafts, bushings, and forgings made of structural steels and cast steel. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft diameter of 50 mm at Vc = 200 m/min, the result is approximately 1273 rpm. Large uncut chip cross sections and demanding, interrupted cutting conditions are natural applications for this grade. For stainless steel, maintain a cutting speed of 50–230 m/min and a constant feed to limit work hardening of the layer being cut. Indexable inserts in grade H6018 are supplied by the Korean brand Horn.
In the ISO 1832 designation, the fourth letter N indicates an insert without a hole or chip breaker, secured in the tool holder with a top clamp. This arrangement provides rigid seating and full edge support, making it suitable for large depths of cut. The coating applied to the carbide substrate increases resistance to abrasion and thermal wear, so the insert retains its sharpness even at high temperatures in the cutting zone. Tolerance class U is wider than class M, reducing insert cost while maintaining sufficient repeatability for roughing. Grade H6018 belongs to the family of general-purpose carbides for steel and stainless steel, covering ISO machining groups P20-P40 and M20-M40.
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Application limitation
Type N indicates an insert without a chip breaker, so when turning ductile steel and stainless steel, the insert geometry itself does not break the chip. Control chip breaking through feed selection and tool holder geometry, and when reliable chip breaking is required — choose a version with a chip breaker.
Triangular insert designation decoder according to ISO 1832
how to read the TPUN 160308 code — designation positions 1–7
Designation TPUN 160308 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 TPUN 160308 insert
design, clamping, and turning parameters
Three — the triangle has 3 corners, while the positive, single-sided geometry (11° clearance angle) allows only one side of the insert to be used. Once a corner becomes dull, rotate the insert in its pocket without changing the tool holder.
The fourth letter N in the ISO 1832 designation indicates an insert without a hole or chip breaker. It is secured in a tool holder with a 16 triangular pocket using a top clamp, providing rigid seating and full edge support at large depths of cut.
Primarily in the nose radius rε: 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. The remaining dimensions (IC 9.525 mm, side length 16.5 mm, thickness 3.18 mm) remain the same.
Yes — grade H6018 covers group ISO M. Maintain a cutting speed of 50–230 m/min, a constant feed, and continuous cooling: austenitic steel dissipates heat poorly and work-hardens when cutting is too slow.
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