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Description
TPGN 110308 turning insert – 60° triangle without a hole
| Technical data | |
|---|---|
| Side length l | 11 mm |
| Insert thickness s | 3.18 mm |
| Inscribed circle IC | 6.35 mm |
| Corner radius rε | 0.8 mm |
| ANSI code | TPGN 222 |
Grade H20 cemented carbide indexable insert – applications and construction
single-sided 60° triangle, positive geometry, without a hole or chip breaker
The TPGN 110308 turning insert is a single-sided, triangular indexable insert made of grade H20 cemented carbide, designed for turning cast iron. 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 promotes smooth chip evacuation. The insert cuts on one side, providing three corners, or three cutting edges. The nose radius rε of 0.8 mm combines a good surface finish with edge strength.
Key advantages of the H20 cemented carbide insert
- Three cutting edges — positive, single-sided geometry provides 3 corners of 60° each, each serving as a separate cutting edge.
- Carbide grade H20 (ISO K15-K25) — for semi-finishing and roughing cast iron; withstands heavy-duty and interrupted cutting conditions.
- Corner radius rε 0.8 mm — a balance between surface finish and edge strength at medium and high feeds.
- The positive clearance angle of 11° reduces cutting forces and friction on the flank face.
- Tolerance class G (ground) provides repeatable corner positioning after indexing the insert in the pocket.
- Dimensions according to ISO 1832: side length 11 mm, IC 6.35 mm (1/4″), thickness 3.18 mm — for tool holders with a triangular insert pocket.
Applications and parameter selection for the triangular insert
The TPGN 110308 insert (also written without a space as tpgn110308) is suitable for semi-finishing and roughing cast iron castings — housings, bushings, and discs — at moderate speeds and medium to high feeds. Grade H20, in the ISO K15-K25 group, withstands heavy-duty cutting conditions and resists mechanical damage, making it well suited to interrupted cuts through the casting skin. Calculate spindle speed using the formula n = 1000·Vc/(π·D): for a shaft with a diameter of 50 mm at a cutting speed of Vc = 100 m/min, the result is approximately 637 rpm. In addition to cast iron, the insert is also suitable for cutting copper alloys, light alloys, heat-resistant and high-temperature-strength materials, and plastics. TPGN 110308 indexable inserts are supplied by the Polish company Baildonit.
The type N design means there is no mounting hole and no chip breaker — the insert is secured in the pocket by a top clamp. Tolerance class G, meaning ground, ensures accurate edge positioning after indexing the insert to the next corner. The triangular profile with a 60° angle reduces radial forces compared with inserts having a 80° or 90° corner, limiting vibration when turning slender workpieces. The thickness of 3.18 mm and inscribed circle IC of 6.35 mm (1/4 inch) match tool holders designed for a triangular pocket with clamp mounting.
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Application limitation
Grade H20 (ISO K15-K25) is intended for cast iron and heavy-duty conditions, not for turning hardened steels or finishing at very high speeds. An insert of type N has no chip breaker — chip control is limited in materials that produce long, ductile chips.
Triangular insert designation decoder according to ISO 1832
how to read the TPGN 110308 code — positions 1–7 of the designation
Designation TPGN 110308 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 TPGN 110308 insert
cutting edges, materials, and insert design
Three — the triangle has 3 corners, and the positive, single-sided geometry (11° clearance angle) allows cutting on only one side of the insert. Once a corner becomes dull, simply index the insert in the pocket to the next cutting edge without replacing the tool holder.
Primarily cast iron — grade H20 belongs to the group ISO K15-K25. It is also suitable for semi-finishing and roughing copper alloys, light alloys, heat-resistant and high-temperature-strength materials, and plastics.
No — the fourth letter N indicates an insert without a hole or chip breaker. It is secured in the tool holder pocket by a top clamp, and chips break due to the cutting edge geometry and workpiece shape, so the insert performs best in cast iron that produces short, brittle chips.
The last two digits (08) represent the nose radius rε in the ISO 1832 designation: 08 ÷ 10 = 0.8 mm. A smaller radius favors finishing at low feeds, while a larger radius favors roughing; the 0.8 mm value is versatile and combines surface finish with corner strength.
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Shipping
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| 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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