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Carbide insert DCMT 11T304 for hardened steels
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  • Carbide insert DCMT 11T304 for hardened steels
  • Carbide insert DCMT 11T304 for hardened steels - nr. 1
Horn

Carbide insert DCMT 11T304 CBN Horn

Horn Horn
0000012242
Cutting edge length: 112 sizes of this insert
07 mm11
€19.42 tax inc.

Net price: €15.79

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W magazynie: 10 pcs.
W magazynie: 10 pcs.

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

Description

DCMT 11T304 turning insert – 55° diamond profile with positive geometry

Technical data
Side length l 11.6 mm
Insert thickness s 3.97 mm
Hole diameter d1 4.4 mm
Corner radius rε 0.4 mm
ANSI code DCMT 32.51
Inscribed circle IC 9.525 mm (3/8″)
DCMT 11T304 indexable turning insert with a CBN edge, single-sided 55° diamond with a mounting hole and chip breaker

DCMT 11T304 turning insert with a CBN edge – applications and design

single-sided 55° diamond for turning hardened steel

The DCMT 11T304 turning insert is a single-sided, diamond-shaped indexable insert with a cubic boron nitride (CBN, Borazon) cutting edge, designed for turning hardened steels above 45 HRC. Shape D, a diamond with a 55° corner angle, facilitates profile and contour machining with good access to the workpiece. The positive geometry with a 7° clearance angle (letter C) reduces cutting forces and is suitable for slender, rigidly clamped shafts. The single-sided design with a mounting hole provides 2 corners, meaning two cutting edges. The nose radius rε of 0.4 mm makes this insert suitable for finishing at low feed rates.

Key benefits of the DCMT 11T304 insert with a CBN edge

  • Two cutting edges — 2 corners with a 55° angle on the positive side of the insert reduce cutting forces on slender workpieces with low rigidity.
  • CBN (boron nitride) edge — hardness second only to diamond allows turning hardened steels and surface-hardened layers, including interrupted cuts.
  • Corner radius rε 0.4 mm — finishing at low feed rates with a good turned surface finish.
  • The positive geometry with a 7° clearance angle reduces friction and built-up edge formation.
  • Dimensions according to ISO 1832: side length 11.6 mm, IC 9.525 mm (3/8″), thickness 3.97 mm — compatible with tool holders with a 11 diamond-shaped pocket.
  • Hard turning with a CBN insert often replaces grinding, consolidating the machining process on a single machine tool.

Applications and cutting parameter selection for the DCMT diamond insert

The DCMT 11T304 insert (also written without spaces as dcmt11t304) is suitable for finish turning hardened and carburized steels, heat-treated shafts, bearing sleeves and surface-hardened components. Calculate spindle speed using the formula n = 1000·Vc/(π·D): for a shaft with a diameter of 40 mm at Vc = 150 m/min, the result is approximately 1194 rpm. As turning inserts for hardened steel, CBN edges perform best with a shallow depth of cut and constant feed rate, protecting the brittle edge and maintaining a stable temperature in the cutting zone. High hot hardness allows CBN to retain its cutting edge where conventional carbide quickly loses its sharpness.

During hard turning, keep the workpiece and tool holder rigidly clamped to limit vibration that damages the cutting edge. Generally machine dry or with a light, continuous coolant supply — frequent interruptions in coolant flow expose CBN to thermal shock. These turning tool inserts are mounted in holders with a D 11 diamond-shaped pocket, selected to suit the machining diameter and reach. Short tool holder and boring bar overhang further increases system rigidity and improves surface finish. Inserts with a CBN edge are supplied by the Korean brand Horn.

▲
Application limitation

The CBN grade is not economical for soft steels below 45 HRC or ductile materials — choose a cemented carbide insert for these. CBN also requires a rigid setup and small uncut chip cross sections.

Rhombic insert designation decoder according to ISO 1832

how to read the DCMT 11T304 code — designation positions 1–7

Designation DCMT 11T304 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 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]

511Size

l = 11.6 mm

IC = 9.525 mm · 3/8″

6T3Thickness

s = 3.97 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 11T304 = 55° diamond · positive 7° · class M · countersunk hole and chip breaker · IC 9.525 mm (l 11.6 mm) · s 3.97 mm · rε 0.4 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 11T304 insert

number of cutting edges, tool selection and hard turning

Two — the diamond has 2 corners with a 55° angle, while the positive, single-sided geometry (letter C, 7° clearance angle) provides access only to the top side of the insert. Once one corner becomes dull, rotate the insert in its pocket to the second cutting edge without changing the tool holder.

Holders with a 11 diamond-shaped pocket (IC 9.525 mm): for external turning SDHCR/L, SDJCR/L and SDNCN with shank cross sections from 12×12 to 32×32 mm; for internal turning, boring bars S16P–S40U with the suffix SDXCR/L, SDPCR/L, SDQCR/L, SDUCR/L or SD-CR/L. The letters R and L indicate right-hand and left-hand versions.

Only in corner radius: 0.4 mm (code 04) is used for finishing at low feed rates and produces lower radial forces, while 0.8 mm (code 08) is a more versatile version with a stronger corner. The other dimensions — IC 9.525 mm and thickness 3.97 mm — are identical.

The cubic boron nitride (CBN) edge is designed for hardened steels above 45 HRC and covers the typical hard turning range. Perform finishing with a shallow depth of cut and rigid clamping; for soft steels below 45 HRC and ductile materials, choose a cemented carbide insert.

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Carbide insert DCMT 11T304 CBN Horn

Carbide insert DCMT 11T304 CBN Horn

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