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Description
TPUN 110304 turning insert – indexable 60° triangle
| Technical data | |
|---|---|
| Side length l | 11 mm |
| Insert thickness s | 3.18 mm |
| Corner radius rε | 0.4 mm |
| ANSI code | TPUN 221 |
Cutting data for the TPUN 110304 insert for steel and stainless steel
finishing, 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 | 0.1 | 1 | 170-240 | 0.15 | 2 | 150-215 | 0.3 | 3 |
| MStainless steel | 110-230 | 0.1 | 1 | 70-175 | 0.15 | 2 | 50-135 | 0.3 | 3 |
HTC cemented carbide indexable insert – applications and design
single-sided 60° triangle, positive geometry, without a hole or chip breaker
The TPUN 110304 turning insert is a single-sided, triangular indexable insert made of HTC grade cemented carbide, designed for turning steel and cast steel. The T shape, an equilateral triangle with a 60° corner angle, facilitates access to the workpiece contour during longitudinal turning and facing. Positive geometry with a 11° clearance angle reduces cutting forces and power consumption, allowing the insert to run smoothly at medium and low speeds. The design without a hole or chip breaker (type N according to ISO 1832) is secured with a top clamp, and the triangle provides three corners, or three cutting edges.
Key features of the HTC cemented carbide insert
- Three cutting edges — three corners on one side of the insert; the positive geometry prevents use of the other side, so the insert is single-sided.
- HTC grade for steel and cast steel — carbide in the ISO P25-P35 group for semi-finishing and roughing, including difficult conditions and interrupted cuts.
- Positive clearance angle of 11° — lower cutting forces and power consumption, beneficial at low and medium speeds and on lower-powered lathes.
- Corner radius rε 0.4 mm — more accurate transitions and a smoother surface at moderate feed rates, closer to finishing than roughing.
- Dimensions conforming to ISO 1832: edge length 11 mm, IC 6.35 mm (1/4″), thickness 3.18 mm — fit holders with a triangular pocket of this size.
- Type N design, without a hole, secured with a top clamp — simple and secure clamping of the insert in the turning tool pocket.
Applications and parameter selection for the triangular insert
HTC is a cemented carbide grade in the ISO P25-P35 group, developed for semi-finishing and roughing steel and cast steel. It handles large uncut chip cross sections and difficult conditions where edge resistance to impact loads is essential. Indexable inserts in this grade resist abrasive wear at elevated cutting temperatures, extending cutting edge life. These are typical inserts for turning tools in one-off and series production. The grade also performs well when turning forgings and steel castings with uneven machining allowances, where the edge encounters varying depths of cut.
The TPUN 110304 insert (also written without a space as tpun110304) performs well when turning shafts, bushings, and flanges made of structural steels, as well as cast steel components. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft with a diameter of 40 mm at Vc = 200 m/min, the result is approximately 1592 rpm. For stainless steel, maintain a cutting speed of 50–230 m/min and a constant feed rate to limit work hardening of the layer being cut. For structural steels, start at the lower feed rates and increase the feed after checking for proper chip breaking. HTC grade turning inserts are supplied by the Korean brand Horn, offered in our range as the store's private label.
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Application limitation
The TPUN insert has tolerance class U (wide) and has no chip breaker — it is intended for roughing and semi-finishing, rather than precision finishing to final dimensions. For turning steels hardened above 45 HRC choose a cubic boron nitride (CBN) insert.
Triangular insert designation decoder according to ISO 1832
how to read the TPUN 110304 code — designation positions 1–7
Designation TPUN 110304 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 110304 insert
number of edges, HTC grade, and turning parameters
Three — the triangle has 3 corners, and the positive geometry (letter P, 11° clearance angle) makes the insert single-sided, with only one working face. When a corner becomes dull, rotate the insert in its pocket to the next edge.
HTC is a cemented carbide grade in the group ISO P25-P35, designed for semi-finishing and roughing steel and cast steel. It handles large uncut chip cross sections and medium and low cutting speeds under difficult operating conditions.
The fourth letter N according to ISO 1832 indicates an insert without a hole or chip breaker. It is secured with a top clamp (clamping arm), and chip flow and breaking are controlled by selecting the feed rate and holder geometry, since the insert has no chip groove of its own.
Yes — HTC grade also covers the group ISO M (stainless steel). 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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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 |
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