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Description
LPKN 1203 turning insert – rectangular indexable insert
| Technical data | |
|---|---|
| Side length l | 12.70 mm |
| Insert thickness s | 3.18 mm |
| Shape | rectangular (L) |
| Designation | LPKN 1203 |
LPKN 1203 cemented carbide indexable insert – applications and design
rectangular shape L, cutting insert for steel, cast steel, and cast iron
The LPKN 1203 turning insert is a rectangular indexable cutting insert made from cemented carbide, with its shape designated by the letter L in the code. Its side length is 12.70 mm and its thickness is 3.18 mm, placing it among medium-sized inserts. The rectangular profile provides long, straight cutting edges along the longer sides, allowing a single insert to use several sections of the cutting edge without changing the holder. It is suitable for machining steel, cast steel, and cast iron in typical turning and flat-surface machining operations.
Key features of the LPKN 1203 indexable insert
- Rectangular shape (letter L) — the long, straight cutting edge is suitable for machining flat surfaces and grooves.
- Dimensions 12.70 × 3.18 mm — side length 12.70 mm and thickness 3.18 mm; a medium-sized insert for typical machining operations.
- Indexable design — once the edge wears out, simply index or replace the insert without removing it from the holder.
- Cemented carbide retains its hardness and wear resistance at elevated temperatures in the cutting zone.
- Intended for steel, cast steel, and cast iron in turning and flat-surface machining.
- Suitable for conventional machine tools and numerically controlled CNC lathes.
Applications and selection of cutting data
In shop practice, LPKN 1203 cemented carbide inserts are used where rapid replacement of a worn cutting edge without resetting the tool holder is important. The rectangular shape provides a long, straight edge useful for machining flat surfaces and cutting steel, cast steel, and cast iron. The cutting insert retains its hardness at elevated cutting zone temperatures, making it suitable for continuous operation on conventional and CNC machine tools. Select the feed and depth of cut to suit workpiece rigidity and spindle power to reduce vibration and edge chipping. Rapid cutting edge replacement is particularly valuable in production machining, where every reduction in downtime increases actual workstation productivity.
Calculate spindle speed using the formula n = 1000·Vc/(π·D). For example, with an approximate cutting speed of Vc = 150 m/min and a workpiece diameter of D = 50 mm, the result is approximately 955 rpm. Select the exact cutting speed to suit the carbide grade and material type — for steel, it is usually higher than for cast iron or cast steel. When machining steels, continuous emulsion cooling and a constant feed are good practice, reducing heat generation in the cutting zone. The designation is also written without a space as lpkn1203; before selecting cutting parameters, confirm the insert grade shown on the packaging, as it determines the speed and feed range.
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Application limitation
Insert grade LPKN 1203 is not specified in the catalog data sheet. Before selecting the cutting speed and ISO group (P, M, K) check the grade designation on the packaging or with the manufacturer; do not use the insert on hardened materials without confirmation.
Frequently asked questions about the LPKN 1203 insert
shape, materials, and selection of turning parameters
Rectangular — the first letter of the designation (L) indicates a rectangular shape. This profile provides long, straight cutting edges along the longer sides, useful for machining flat surfaces and grooves.
For cutting steel, cast steel, and cast iron in typical turning and flat surface machining operations. Confirm the specific material range and ISO group (P, M, K) based on the grade designation shown on the insert packaging.
These are insert dimension codes: they correspond to the side length 12.70 mm and a thickness of 3.18 mm. The letters LPKN describe the insert shape and design, while the numeric portion encodes its size.
Use the formula n = 1000·Vc/(π·D). For an example cutting speed of Vc = 150 m/min and a workpiece diameter of D = 50 mm, the result is approximately 955 rpm. Select the cutting speed Vc to suit the carbide grade and workpiece material.
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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 |
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