- 98% satisfied customers
- 72h delivery
- 30 dni na zwrot
Description
TPUN 160304 turning insert – positive 60° triangle
| Technical data | |
|---|---|
| Side length l | 16.5 mm |
| Insert thickness s | 3.18 mm |
| Corner radius rε | 0.4 mm |
| ANSI code | TPUN 321 |
Cutting data for the TPUN insert for steel and stainless steel
finishing, semi-finishing, and roughing — steel and stainless steel
| 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 | 0.1 | 1 | 170-240 | 0.15 | 3.5 | 150-215 | 0.3 | 5 |
| MStainless steel | 110-230 | 0.1 | 1 | 70-175 | 0.15 | 3.5 | 50-135 | 0.3 | 5 |
Grade H8320 cemented carbide indexable insert – applications and construction
positive 60° triangle without a hole, single-sided — three cutting edges
The TPUN 160304 turning insert is a single-sided, triangular indexable insert made of grade H8320 cemented carbide, designed for turning steel, cast steel, and stainless steel. Shape T denotes an equilateral triangle with a 60° corner angle, which facilitates access to the workpiece contour during longitudinal turning and facing. The positive geometry with a 11° clearance angle reduces cutting forces and power requirements — the insert uses one side, providing three cutting edges. The absence of a hole (type N according to ISO 1832) means it is secured by a top clamp, without a central screw.
Grade H8320 is a CVD-coated cemented carbide designed for harder materials and enhanced abrasion resistance at high temperatures. The CVD coating forms a thick, durable layer that protects the substrate at large chip cross sections and during interrupted contact with the material. This makes the insert suitable for high-productivity medium machining and roughing of steel and cast steel, even under heavy, unstable cutting conditions. The hard carbide core supports the cutting edge as forces and cutting zone temperatures increase.
Key advantages of the H8320 cemented carbide insert
- Positive geometry α 11° — lower cutting forces and power consumption, beneficial on less powerful machine tools and for slender workpieces prone to deflection.
- Grade H8320 with CVD coating — enhanced carbide for harder materials, for high-productivity medium machining and roughing of steel and cast steel under heavy cutting conditions.
- Corner radius rε 0.4 mm — the small radius promotes precision finishing and reduces radial forces at low feed rates.
- The 60° corner angle allows both longitudinal turning and facing without changing the holder between operations.
- Dimensions comply with ISO 1832: edge length 16.5 mm, IC 9.525 mm (3/8″), thickness 3.18 mm — compatible with tool holders with a size 16 triangular pocket.
- Tolerance class U provides a wide dimensional tolerance range — an economical solution where high cutting edge positioning repeatability is not required.
Applications and parameter selection for the triangular insert
The TPUN 160304 insert (also written without spaces as tpun160304) is suitable for turning shafts, bushings, and flanges made of structural steels and cast steel, as well as stainless steel components. Calculate spindle speed using the formula n = 1000·Vc/(π·D): for a shaft diameter of 50 mm at Vc = 200 m/min, the result is approximately 1273 rpm. For stainless steel, maintain a cutting speed in the range of 50–230 m/min and a constant feed rate to limit work hardening of the layer being cut. Since the insert has no hole, select a holder with a size 16 triangular pocket that secures the insert with a top clamp. Grade H8320 indexable inserts are supplied by the Korean brand Horn.
▲
Application limitation
Grade H8320 is a CVD-coated carbide — despite its enhanced resistance, it does not replace cubic boron nitride inserts when turning hardened steels above 45 HRC. For hard machining, choose a version with a cutting edge made of CBN.
Triangular insert designation decoder according to ISO 1832
how to read the TPUN 160304 code — designation positions 1–7
Designation TPUN 160304 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 160304 insert
number of cutting edges, clamping, corner radius, and materials
Three — the triangle has 3 corners, and the positive, single-sided geometry (11° clearance angle) allows only one side of the insert to be used. Once one corner wears out, index the insert in its pocket to the next of the three cutting edges.
The TPUN insert has no hole (type N according to ISO 1832), so it is secured in the holder from above with a clamping arm rather than a central screw. Select a holder with a triangular pocket of size 16 (IC 9.525 mm).
The radius rε 0.4 mm is a small corner radius that supports precision finishing at low feed rates and reduces radial forces. Larger radii (0.8 or 1.2 mm) in the TPUN 1603 family are selected for heavier roughing.
Yes — the cutting data covers the stainless steel group. 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.
Product accessories
Reviews
No customer reviews for the moment.
Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| 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 |
Recommended for you
This website uses its own and third-party cookies to improve our services and show you advertising related to your preferences by analyzing your browsing habits. To give your consent to its use, press the Accept button.
Cookie preferences
Functional cookiesTechnical
Functional cookies are strictly necessary to provide the services of the shop, as well as for its proper functioning, so it is not possible to refuse their use. They allow the user to browse through our website and use the different options or services that exist on it.
Advertising Cookies
These are cookies that collect information about the advertisements shown to users of the website. They can be anonymous, if they only collect information about the advertising spaces shown without identifying the user, or personalised, if they collect personal information about the user of the shop by a third party, for the personalisation of these advertising spaces.
Analytics cookies
Collect information about the user's browsing experience in the shop, usually anonymously, although sometimes they also allow the user to be uniquely and unequivocally identified in order to obtain reports on the user's interests in the products or services offered by the shop.