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Carbide insert TCMT 090204 H6310 Horn
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  • Carbide insert TCMT 090204 H6310 Horn
  • Carbide insert TCMT 090204 H6310 Horn - nr. 1
Horn

Carbide insert TCMT 090204 H6310 Horn

Horn Horn
0000010700
Cutting edge length: 093 sizes of this insert
091116
€4.05 tax inc.

Net price: €3.29

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Description

TCMT 090204 turning insert – single-sided 60° triangle

Technical data
Side length l 9 mm
Insert thickness s 2.38 mm
Hole diameter d1 2.5 mm
Corner radius rε 0.4 mm
ANSI code TCMT 1.81.51
TCMT 090204 indexable turning insert in H6310 cemented carbide, single-sided 60° triangle with a countersunk hole and chip breaker

Cutting data for the TCMT 090204 insert for steel and stainless steel

finishing, semi-finishing and roughing — ISO P and M groups

MaterialFinishingSemi-finishingRoughing
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 250-350 0.05 0.1 180-270 0.1 0.3 170-220 0.19 1.7
MStainless steel 125-260 0.05 0.1 100-220 0.1 0.3 80-200 0.19 1.7

Grade H6310 cemented carbide indexable insert – applications and construction

single-sided 60° triangle with a countersunk hole and chip breaker

The TCMT 090204 turning insert is a single-sided, positive triangular insert made of cemented carbide in grade H6310, intended for turning steel and stainless steel. Shape T, an equilateral triangle with a 60° corner angle, improves access to the workpiece contour during longitudinal turning, profile turning, and boring. The 7° clearance angle (letter C) indicates positive, single-sided geometry — three cutting edges are available, one at each corner. The rε 0.4 mm corner radius supports precision machining and finishing at low feeds with a good surface finish. The countersunk hole and single-sided chip breaker (type T according to ISO 1832) control chip flow.

Key advantages of the H6310 cemented carbide insert

  • Three cutting edges — 3 corners on one side of the insert; the positive, single-sided geometry uses one rake face.
  • Grade H6310 for ISO groups P and M — PVD-coated carbide: steel (P20-P40) and stainless steel (M20-M40), occasionally also cast iron.
  • Corner radius rε 0.4 mm — precision machining and finishing at low feeds with a good surface finish.
  • The positive 7° clearance angle reduces cutting forces — less vibration on slender and thin-walled parts.
  • Dimensions according to ISO 1832: edge length 9 mm, IC 5.56 mm (7/32″), thickness 2.38 mm — fit holders with a 09 pocket.
  • The single-sided chip breaker and countersunk hole allow secure screw clamping and controlled chip breaking.

Applications and parameter selection for the triangular insert

The TCMT 090204 insert (also written without a space as tcmt090204) is suitable for finish turning shafts, bushings, pins, and small parts made of structural steels, as well as stainless steel components. Positive geometry produces low cutting forces, so the insert performs well on slender and thin-walled parts and when boring small holes. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft with a diameter of 20 mm at Vc = 250 m/min, the result is approximately 3979 rpm. For stainless steels, maintain a cutting speed of 80–260 m/min, a constant feed, and continuous coolant flow to avoid work hardening of the layer being cut. Grade H6310 indexable inserts are supplied by the Korean brand Horn.

Grade H6310 is a fine-grained cemented carbide with a PVD coating, covering ISO groups P20–P40 and M20–M40. The PVD coating preserves edge sharpness, making the insert suitable for ductile materials and machining with coolant. The single-sided chip breaker forms short, controlled chips, which is important when turning stainless steel and operating automatic lathes. However, the 0.4 mm radius and thin 2.38 mm cross section limit the depth of cut — an insert with a larger radius and greater thickness is better for rough turning with heavy stock removal.

▲
Application limitation

Grade H6310 is not intended for steels hardened above 45 HRC — for hard turning, select a cubic boron nitride insert (CBN) or ceramic, rather than a cemented carbide insert.

Triangular insert designation decoder according to ISO 1832

how to read the TCMT 090204 code — designation positions 1–7

Designation TCMT 090204 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.

ISO 1832 designation decoder — how to read the code

1Tshape 2Cangle α 3Mtolerance 4Ttype – 509size 602thickness 704radius rε

Positions 1–4 · ISO code

1TShape

60° triangle

3 corners of 60° per side

2CClearance angle

α = 7°

positive, single-sided

3MTolerance

Class M (intermediate)

IC ±0.05 · thickness ±0.13 mm

4TType

Countersunk hole + chip breaker

countersink 40–60°, single-sided chip breaker

Positions 5–7 · dimensions [mm]

509Size

l = 9 mm

IC = 5.56 mm · 7/32″

602Thickness

s = 2.38 mm

between rake faces

704Corner radius

rε = 0.4 mm

code ÷ 10 → radius in mm

✓ 3 corners × 1 side = 3 cutting edges

Full designation: TCMT 090204 = 60° triangle · 7° positive · class M · countersunk hole and chip breaker · IC 5.56 mm (l 9 mm) · s 2.38 mm · rε 0.4 mm

Compatible turning tools

tool holders with a size 09 triangular pocket — external and internal turning

STJCR/L 0808 E098×8 × 70 mmR right-hand
←L left-hand
→
STJCR/L 1010 E0910×10 × 70 mmR right-hand
←L left-hand
→
STGCR/L 0808 E098×8 × 70 mmR right-hand
←L left-hand
→
STGCR/L 1010 E0910×10 × 70 mmR right-hand
←L left-hand
→
STFCR/L 0808 E098×8 × 70 mmR right-hand
←L left-hand
→
STFCR/L 1010 E0910×10 × 70 mmR right-hand
←L left-hand
→
S10K STUCR/L-09Ø10 | Ømin 13 mm | L=125R right-hand
←L left-hand
→
S12K STUCR/L-09Ø12 | Ømin 16 mm | L=125R right-hand
←L left-hand
→
S10K STFCR/L-09Ø10 | Ømin 13 mm | L=125R right-hand
←L left-hand
→
S12K STFCR/L-09Ø12 | Ømin 17 mm | L=125R right-hand
←L left-hand
→
S12K ST-CR/L-09Ø12 | Ømin 17 mm | L=125R right-hand
←L left-hand
→

Frequently asked questions about the TCMT 090204 insert

use, turning tool selection, and turning parameters

Three — the triangle has 3 corners, and the positive, single-sided geometry (7° clearance angle) uses only the top rake face. Once an edge becomes dull, rotate the insert in the pocket to the next corner without changing the tool holder.

Tool holders with a size 09 triangular pocket (IC 5.56 mm): for external turning STJCR/L (entering angle 93°), STGCR/L and STFCR/L (90°) with shank cross sections of 8×8 and 10×10 mm; for internal turning, boring bars S10K and S12K with an STUCR/L, STFCR/L, or ST-CR/L designation suffix for holes from Ø13 mm.

Only in corner radius: 0.2 mm is used for precision finishing and thin chips, 0.4 mm is a general-purpose finishing option, while 0.8 mm allows a higher feed at a slightly greater depth of cut. The other dimensions (IC 5.56 mm, thickness 2.38 mm) are identical.

Yes — grade H6310 covers group ISO M20-M40. Maintain a cutting speed of 80–260 m/min, a constant feed, and continuous emulsion cooling: austenitic steel conducts heat poorly and work-hardens when cutting is too slow.

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Carbide insert TCMT 090204 H6310 Horn

Carbide insert TCMT 090204 H6310 Horn

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