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Carbide insert DCMT 11T308 for hardened steels
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  • Carbide insert DCMT 11T308 for hardened steels
  • Carbide insert DCMT 11T308 for hardened steels - nr. 1
Horn

Carbide insert DCMT 11T308 CBN Horn

Horn Horn
2667
€19.42 tax inc.

Net price: €15.79

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W magazynie: 10-100 szt.

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Description

DCMT 11T308 turning insert – 55° diamond CBN insert

Technical data
Side length l 11.6 mm
Insert thickness s 3.97 mm
Hole diameter d1 4.4 mm
Corner radius rε 0.8 mm
ANSI code DCMT 32.52
Horn DCMT 11T308 diamond turning insert with a CBN tip, single-sided, 55° corner angle, for hard turning hardened steels

DCMT 11T308 CBN turning insert – applications and design

single-sided 55° diamond with a cubic boron nitride tip

The DCMT 11T308 turning insert is a single-sided, diamond-shaped indexable insert with a cubic boron nitride (CBN) tip from Horn, designed for hard turning hardened steels above 45 HRC. Shape D, a diamond with a 55° corner angle, facilitates contour machining and profile copying with good access to narrow transitions. The positive geometry with a 7° clearance angle (letter C) reduces cutting forces and friction against the machined surface, which is important for slender workpieces with low rigidity. Two corners on the working side provide two cutting edges, and the nose radius rε of 0.8 mm ensures a smooth surface during finishing. Cubic boron nitride retains its hardness and sharpness at the high temperatures in the cutting zone, making it effective where cemented carbide quickly loses its cutting edge.

Key features of the DCMT 11T308 CBN insert

  • CBN (Borazon) tip — cubic boron nitride is the hardest tool material after diamond and maintains edge sharpness when turning hardened steels in the 45–65 HRC range.
  • Two cutting edges — two 55° corners on one side of the insert; a single-sided, positive design intended for finishing operations.
  • Corner radius rε 0.8 mm — a balance between surface finish and tip strength at shallow depths of cut.
  • The 55° diamond shape (letter D) is suitable for longitudinal turning, copy turning and machining contours with varying angles.
  • Tolerance class M provides repeatable cutting edge positioning after indexing the insert in the holder pocket.
  • The countersunk hole secures the insert with a clamping screw in tool holders with a 11 diamond-shaped pocket (IC 9.525 mm).

Applications and cutting parameter selection for the CBN diamond insert

The DCMT 11T308 insert (also written without spaces as dcmt11t308) is suitable for hard turning shafts, bearing seats, gears and die components after hardening, and thanks to the resistance of CBN, also for interrupted cuts. Calculate spindle speed using the formula n = 1000·Vc/(π·D): for a shaft with a diameter of 40 mm at a cutting speed of Vc = 150 m/min, the result is approximately 1193 rpm. Perform hard turning with a shallow depth of cut and a low feed rate to limit thermal loading on the edge and achieve surface quality comparable to grinding. In many continuous cutting applications, CBN operates without coolant, and the process replaces a separate grinding operation, reducing part production time. CBN indexable inserts are supplied by the Korean brand Horn, the store's private label.

▲
Application limitation

CBN inserts require rigid workpiece and tool clamping and shallow depths of cut (typically ap 0.1–0.3 mm). CBN is not economical for soft, unhardened steel or stainless steel — in these cases, choose an insert DCMT 11T308 made of cemented carbide.

Rhombic insert designation decoder according to ISO 1832

how to read the DCMT 11T308 code — designation positions 1–7

Designation DCMT 11T308 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 – 511size 6T3thickness 708radius 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]

511Size

l = 11.6 mm

IC = 9.525 mm · 3/8″

6T3Thickness

s = 3.97 mm

between rake faces

708Corner radius

rε = 0.8 mm

code ÷ 10 → radius in mm

✓ 2 corners × 1 side = 2 cutting edges

Full designation: DCMT 11T308 = 55° diamond · positive 7° · class M · countersunk hole and chip breaker · IC 9.525 mm (l 11.6 mm) · s 3.97 mm · rε 0.8 mm

Compatible turning tools

holders with a 11 diamond-shaped pocket — external and internal turning

SDHCR/L 1616 H1116×16 × 100 mmR right-hand
←L left-hand
→
SDHCR/L 2020 K1120×20 × 125 mmR right-hand
←L left-hand
→
SDHCR/L 2525 M1125×25 × 150 mmR right-hand
←L left-hand
→
SDHCR/L 3232 P1132×32 × 170 mmR right-hand
←L left-hand
→
SDJCR/L 1212 F1112×12 × 80 mmR right-hand
←L left-hand
→
SDJCR/L 1616 H1116×16 × 100 mmR right-hand
←L left-hand
→
SDJCR/L 2020 K1120×20 × 125 mmR right-hand
←L left-hand
→
SDJCR/L 2525 M1125×25 × 150 mmR right-hand
←L left-hand
→
SDJCR/L 3232 P1132×32 × 170 mmR right-hand
←L left-hand
→
SDNCN 1212 F1112×12 × 80 mmR right-hand
←L left-hand
→
SDNCN 1616 H1116×16 × 100 mmR right-hand
←L left-hand
→
SDNCN 2020 K1120×20 × 125 mmR right-hand
←L left-hand
→
SDNCN 2525 M1125×25 × 150 mmR right-hand
←L left-hand
→
SDNCN 3232 P1132×32 × 170 mmR right-hand
←L left-hand
→
S16P SDXCR/L-11Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
S20R SDXCR/L-11Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
S25S SDXCR/L-11Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
S32T SDXCR/L-11Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
S40U SDXCR/L-11Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
S16P SDPCR/L-11Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
S20R SDPCR/L-11Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
S25S SDPCR/L-11Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
S32T SDPCR/L-11Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
S40U SDPCR/L-11Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
S16P SD-CR/L-11Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
S20R SD-CR/L-11Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
S25S SD-CR/L-11Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
S32T SD-CR/L-11Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
S40U SD-CR/L-11Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
S16P SDQCR/L-11Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
S20R SDQCR/L-11Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
S25S SDQCR/L-11Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
S32T SDQCR/L-11Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
S40U SDQCR/L-11Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
S16P SDUCR/L-11Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
S20R SDUCR/L-11Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
S25S SDUCR/L-11Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
S32T SDUCR/L-11Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
S40U SDUCR/L-11Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→

Frequently asked questions about the DCMT 11T308 insert

number of cutting edges, tool selection and hard turning

Two — the 55° diamond has 2 corners on the working side, while the positive, single-sided geometry (letter D) uses only one face. Once one corner is worn, rotate the insert in its pocket to the other without replacing the tool holder.

Holders with a 11 diamond-shaped pocket (IC 9.525 mm): for external turning SDHCR/L, SDJCR/L and SDNCN with cross sections of 12×12–32×32 mm; for internal turning, boring bars S16P–S40U with the suffix SDXCR/L, SDPCR/L, SDQCR/L or SDUCR/L. Right-hand (R) and left-hand (L) versions are available.

Only in corner radius: 0.4 mm is used for finishing at low feed rates, 0.8 mm is a general-purpose finishing version, while 1.2 mm is selected for higher feed rates and deeper cuts. The other dimensions (IC 9.525 mm, thickness 3.97 mm) are identical.

Yes — this is its primary application. The cubic boron nitride tip machines hardened steels in the range of 45–65 HRC, replacing grinding with hard turning. Use rigid clamping, a shallow depth of cut and a low feed rate.

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Carbide insert DCMT 11T308 CBN Horn

Carbide insert DCMT 11T308 CBN Horn

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