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Carbide insert DCMT 070204 MV H6310 Horn - Turning inserts
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  • Carbide insert DCMT 070204 MV H6310 Horn - Turning inserts
  • Carbide insert DCMT 070204 MV H6310 Horn - Turning inserts - nr. 1
Horn

Carbide insert DCMT 070204 MV H6310 Horn

Horn Horn
0000004044
Cutting edge length: 07 mm2 sizes of this insert
07 mm11
€3.88 tax inc.

Net price: €3.16

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Call and order: (44) 755-04-05

Description

DCMT 070204 turning insert – 55° diamond for finishing

Technical data
Side length l 7.75 mm
Insert thickness s 2.38 mm
Hole diameter d1 2.8 mm
Corner radius rε 0.4 mm
ANSI code DCMT 21.51
DCMT 070204 diamond-shaped turning insert made of H6310 cemented carbide, single-sided 55° diamond with a mounting hole and chip breaker

Cutting data for the DCMT 070204 insert for steel and stainless steel

finishing and semi-finishing — ISO groups P and M

MaterialFinishingSemi-finishing
Vc [m/min]Feed f [mm/rev]ap [mm]Vc [m/min]Feed f [mm/rev]ap [mm]
PSteel 200-295 0.03-0.11 0.06-0.26 170-240 0.06-0.1 0.6-1.5
MStainless steel 110-230 0.03-0.11 0.06-0.26 70-175 0.06-0.1 0.6-1.5

Diamond-shaped H6310 cemented carbide insert – applications and design

single-sided 55° diamond, positive geometry with a hole and chip breaker

The DCMT 070204 turning insert is a single-sided, diamond-shaped insert made of grade H6310 cemented carbide, designed for finishing and semi-finishing steel and stainless steel. Shape D, a diamond with a 55° corner angle, facilitates copy turning and access to the workpiece contour from several directions. The positive geometry with a 7° clearance angle reduces cutting forces, making the insert suitable for slender shafts and boring small holes. The rε 0.4 mm corner radius provides a smooth surface at low feed rates, while the countersunk mounting hole allows the screw to clamp the insert securely in the pocket.

Key features of the H6310 cemented carbide insert

  • Two cutting edges — 2 sharp 55° corners on one side of the insert; after the first wears out, index the insert by 180° without changing the holder.
  • Grade H6310 for ISO groups P and M — general-purpose PVD-coated carbide: steel (P20-P40) and stainless steel (M20-M40), and occasionally cast iron.
  • Corner radius rε 0.4 mm — small radius for finishing: a smooth surface and lower radial forces at low feed rates.
  • The positive 7° clearance angle reduces flank friction — less heat and vibration on thin-walled workpieces.
  • The IC of 6.35 mm (1/4″) and thickness of 2.38 mm fit holders and boring bars with a size 07 D-shaped diamond insert pocket.
  • Tolerance class M provides repeatable cutting edge positioning after indexing the insert in its pocket, without adjusting the turning tool setting.

Applications and cutting data selection for the diamond-shaped insert

The DCMT 070204 insert (also written without spaces as dcmt070204) is suitable for finishing shafts, bushings, and thin-walled components made of structural steels and stainless steel. Calculate spindle speed using the formula n = 1000·Vc/(π·D): for a shaft diameter of 30 mm at Vc = 250 m/min, the result is approximately 2653 rpm. For stainless steel, maintain a cutting speed of 110–230 m/min and a constant feed rate of 0.06–0.11 mm/rev to limit work hardening of the layer being cut. Grade H6310 indexable inserts are supplied by the Korean brand Horn.

The PVD coating increases the cutting edge's resistance to wear and built-up edge, which is important when turning gummy stainless steel. The single-sided design provides two cutting corners — after the first wears out, simply index the insert by 180° in its pocket. The small IC of 6.35 mm and positive rake angle also make the insert suitable for boring holes from approximately 10 mm in diameter using boring bars with a D-shaped pocket. The chip breaker formed on the rake face curls and breaks chips even at low feed rates, facilitating operation without constant supervision. For internal machining, select the shortest boring bar overhang that reaches the hole depth to reduce vibration and improve surface finish.

▲
Application limitation

The thin, positive DCMT 070204 insert (thickness s 2.38 mm) is designed for finishing and semi-finishing — not for heavy rough turning at large depths of cut. Grade H6310 does not cover hardened steels above 45 HRC; for hard turning, choose a cubic boron nitride (CBN) insert.

Rhombic insert designation decoder according to ISO 1832

how to read the DCMT 070204 code — positions 1–7 of the designation

Designation DCMT 070204 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

1Dshape 2Cangle α 3Mtolerance 4Ttype – 507size 602thickness 704radius rε

Positions 1–4 · ISO code

1DShape

55° rhombus

2 corners of 55° 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]

507Size

l = 7.75 mm

IC = 6.35 mm · 1/4″

602Thickness

s = 2.38 mm

between rake faces

704Corner radius

rε = 0.4 mm

code ÷ 10 → radius in mm

✓ 2 corners × 1 side = 2 cutting edges

Full designation: DCMT 070204 = 55° diamond · positive 7° · class M · countersunk hole and chip breaker · IC 6.35 mm (l 7.75 mm) · s 2.38 mm · rε 0.4 mm

Compatible turning tools

holders and boring bars with a D-shaped diamond pocket (IC 6.35 mm) — external and internal turning

SDHCR/L 0808 E078×8 × 70 mmR right-hand
←L left-hand
→
SDHCR/L 1010 E0710×10 × 70 mmR right-hand
←L left-hand
→
SDHCR/L 1212 F0712×12 × 80 mmR right-hand
←L left-hand
→
SDHCR/L 1616 H0716×16 × 100 mmR right-hand
←L left-hand
→
SDJCR/L 0808 E078×8 × 70 mmR right-hand
←L left-hand
→
SDJCR/L 1010 E0710×10 × 70 mmR right-hand
←L left-hand
→
SDJCR/L 1212 F0712×12 × 80 mmR right-hand
←L left-hand
→
SDJCR/L 1616 H0716×16 × 100 mmR right-hand
←L left-hand
→
SDNCN 0808 E078×8 × 70 mmR right-hand
←L left-hand
→
SDNCN 1010 E0710×10 × 70 mmR right-hand
←L left-hand
→
SDNCN 1212 F0712×12 × 80 mmR right-hand
←L left-hand
→
SDNCN 1616 H0716×16 × 100 mmR right-hand
←L left-hand
→
S12K SDXCR/L-07Ø12 | Ømin 17 mm | L=125R right-hand
←L left-hand
→
S10K SDPCR/L-07Ø10 | Ømin 13 mm | L=125R right-hand
←L left-hand
→
S12K SDPCR/L-07Ø12 | Ømin 16 mm | L=125R right-hand
←L left-hand
→
S10K SD-CR/L-07Ø10 | Ømin 14 mm | L=125R right-hand
←L left-hand
→
S12K SD-CR/L-07Ø12 | Ømin 17 mm | L=125R right-hand
←L left-hand
→
S12x16P SD-CR/L-07Ø16 | Ømin 17 mm | L=150R right-hand
←L left-hand
→
S10K SDQCR/L-07Ø10 | Ømin 13 mm | L=125R right-hand
←L left-hand
→
S10x16P SDQCR/L-07Ø16 | Ømin 13 mm | L=150R right-hand
←L left-hand
→
S12K SDQCR/L-07Ø12 | Ømin 16 mm | L=125R right-hand
←L left-hand
→
S12x16P SDQCR/L-07Ø16 | Ømin 16 mm | L=150R right-hand
←L left-hand
→
S16P SDQCR/L-07Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
S20R SDQCR/L-07Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
S10K SDUCR/L-07Ø10 | Ømin 13 mm | L=125R right-hand
←L left-hand
→
S10x16P SDUCR/L-07Ø16 | Ømin 13 mm | L=150R right-hand
←L left-hand
→
S12K SDUCR/L-07Ø12 | Ømin 16 mm | L=125R right-hand
←L left-hand
→
S12x16P SDUCR/L-07Ø16 | Ømin 16 mm | L=150R right-hand
←L left-hand
→
S16P SDUCR/L-07Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
S20R SDUCR/L-07Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→

Frequently asked questions about the DCMT 070204 insert

number of cutting edges, turning tool selection, and stainless steel turning

Two — the diamond has 2 acute corners 55°, and the positive, single-sided geometry (7° clearance angle) allows cutting with only one side of the insert. After the first corner wears out, index the insert by 180° in its pocket without changing the holder.

Holders and boring bars with a D-shaped diamond pocket, size 07 (IC 6.35 mm): for external turning SDJCR/L and SDHCR/L and SDNCN with cross sections of 8×8–16×16 mm; for internal turning, boring bars SDQCR/L, SDUCR/L, SDPCR/L and SD-CR/L from Ø10 to Ø20 mm in diameter.

The small radius 0.4 mm is a finishing version: low radial forces and a smooth surface at low feed rates. For more general-purpose use, choose 0.8 mm, and for higher feed rates, a radius of 1.2 mm; the other dimensions in the DCMT 0702 family remain identical.

Yes — grade H6310 covers group ISO M20-M40. Maintain a cutting speed of 110–230 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 DCMT 070204 MV H6310 Horn

Carbide insert DCMT 070204 MV H6310 Horn

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