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Carbide insert CNMG 120408 HS H6310 Horn - Turning inserts - nr. 1
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  • Carbide insert CNMG 120408 HS H6310 Horn - Turning inserts - nr. 1
  • Carbide insert CNMG 120408 HS H6310 Horn - Turning inserts - nr. 2
Horn

Carbide insert CNMG 120408 HS H6310 Horn

Horn Horn
011115
€7.12 tax inc.

Net price: €5.79

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

Description

CNMG 120408 turning insert – indexable 80° diamond

Technical data
Side length l 12.9 mm
Insert thickness s 4.76 mm
Hole diameter d1 5.16 mm
Corner radius rε 0.8 mm
ANSI code CNMG 432
CNMG 120408 indexable turning insert made of H6310 cemented carbide, double-sided 80° diamond with a hole and chip breaker

Cutting data for the CNMG 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 220-400 0.1-0.2 0.5-2 130-200 0.22-0.44 1-4 170-190 0.22-0.44 1-4
MStainless steel 220-320 0.1-0.2 0.5-2 70-100 0.22-0.44 1-4 55-75 0.22-0.44 1-4

Grade H6310 cemented carbide indexable insert – applications and construction

double-sided 80° diamond with a hole and chip breaker

The CNMG 120408 turning insert is a double-sided, diamond-shaped indexable insert made of grade H6310 cemented carbide, designed for turning steel and stainless steel. Shape C, a diamond with a 80° corner angle, combines a rigid, strong corner with good contour access during longitudinal turning and facing. The negative geometry with a 0° clearance angle allows both sides of the insert to be used — a total of four cutting edges. The rε 0.8 mm corner radius combines a good surface finish with edge strength at feed rates of 0.22–0.44 mm/rev.

The mounting hole and chip breakers on both sides (type G according to ISO 1832) control chip flow and chip breaking at varying depths of cut. Once one cutting edge wears out, index the insert in its pocket without removing it from the holder or resetting the turning tool. Tolerance class M maintains repeatable cutting edge positioning relative to the inscribed circle IC 12.7 mm, so the tool point remains constant after each indexing operation. The PVD coating increases the cutting edge's resistance to wear and thermal loads during continuous and lightly interrupted turning.

Key advantages of the H6310 cemented carbide insert

  • Four cutting edges — 2 usable 80° corners on each of the two sides reduce the cost per cutting edge compared with single-sided inserts.
  • 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.
  • Rigid 80° corner — a load-resistant corner for roughing and semi-finishing shafts, bushings, and flanges.
  • The nose radius rε of 0.8 mm is a general-purpose version — semi-finishing without changing the insert between roughing and finishing passes.
  • Tolerance class M provides repeatable cutting edge positioning after indexing the insert in the holder pocket.
  • Dimensions according to ISO 1832: IC 12.7 mm (1/2″), side length 12.9 mm, thickness 4.76 mm — fit holders with a size 12 pocket as turning tool inserts.

Applications and cutting data selection for the diamond-shaped insert

The CNMG 120408 insert (also written without spaces as cnmg120408) is a proven choice for turning shafts, bushings, and flanges made of structural steels, as well as stainless steel components. Calculate spindle speed using the formula n = 1000·Vc/(π·D): for a shaft diameter of 50 mm at Vc = 250 m/min, the result is approximately 1592 rpm. Adjust this value to suit workpiece rigidity, the clamping method, and the lathe's spindle power. Grade H6310 indexable inserts are supplied by the Korean brand Horn.

For stainless steels, maintain a cutting speed in the range of 55–320 m/min and a constant feed rate to limit work hardening of the layer being cut and ensure continuous heat removal with emulsion coolant. Choose a smaller corner radius for finishing and a larger one for roughing — rε 0.8 mm remains a versatile compromise for most external and internal turning operations. The same code is available in the family with radii of 0.4 mm and 1.2 mm, allowing the insert to be matched to the required surface roughness and chip cross section.

▲
Application limitation

Grade H6310 is not intended for steels hardened above 45 HRC — for hard turning, select the version CNMG 120408 CBN with a cubic boron nitride cutting edge.

Rhombic insert designation decoder according to ISO 1832

how to read the CNMG 120408 code — positions 1–7 of the designation

Designation CNMG 120408 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

1Cshape 2Nangle α 3Mtolerance 4Gtype – 512size 604thickness 708radius rε

Positions 1–4 · ISO code

1CShape

80° rhombus

2 corners of 80° per side

2NClearance angle

α = 0°

negative, double-sided

3MTolerance

Class M (intermediate)

IC ±0.08 · thickness ±0.13 mm

4GType

Hole + chip breaker

chip breaker on both sides

Positions 5–7 · dimensions [mm]

512Size

l = 12.9 mm

IC = 12.7 mm · 1/2″

604Thickness

s = 4.76 mm

between rake faces

708Corner radius

rε = 0.8 mm

code ÷ 10 → radius in mm

✓ 2 corners × 2 sides = 4 cutting edges

Full designation: CNMG 120408 = 80° diamond · negative · class M · hole and chip breaker · IC 12.7 mm (l 12.9 mm) · s 4.76 mm · rε 0.8 mm

Compatible turning tools

holders with a 12 diamond-shaped pocket — external and internal turning

TCLNR/L 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
TCLNR/L 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
TCLNR/L 3232 P1232×32 × 170 mmR right-hand
←L left-hand
→
TCLNR/L 4040 S1240×40 × 250 mmR right-hand
←L left-hand
→
PCLNR/L 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
PCLNR/L 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
PCLNR/L 3232 P1232×32 × 170 mmR right-hand
←L left-hand
→
PCBNR/L 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
PCBNR/L 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
PCBNR/L 3232 P1232×32 × 170 mmR right-hand
←L left-hand
→
PCMNN 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
PCMNN 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
PCMNN 3232 P1232×32 × 170 mmR right-hand
←L left-hand
→
TCMNN 1616 H1216×16 × 100 mmR right-hand
←L left-hand
→
TCMNN 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
TCMNN 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
TCMNN 3232 P1232×32 × 170 mmR right-hand
←L left-hand
→
TCZNN 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
TCZNN 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
TCZNN 3232 P1232×32 × 170 mmR right-hand
←L left-hand
→
TCBNR/L 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
TCKNR/L 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
TCKNR/L 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
S20R TCLNR/L-12Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
S25S TCLNR/L-12Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
S32T TCLNR/L-12Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
S40U TCLNR/L-12Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
S50V TCLNR/L-12Ø50 | Ømin 63 mm | L=400R right-hand
←L left-hand
→
S25S PCLNR/L-12Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
S32T PCLNR/L-12Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
S40U PCLNR/L-12Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→

Frequently asked questions about the CNMG 120408 insert

use, turning tool selection, and turning parameters

Four — the 80° diamond has 2 usable corners per side, and the negative geometry (0° clearance angle) allows both sides of the insert to be used. Once an edge becomes dull, simply rotate the insert in its pocket without changing the holder.

Holders with a 12 diamond-shaped pocket (IC 12.7 mm): for external turning TCLNR/L and PCLNR/L (entering angle 95°), PCBNR/L, TCBNR/L and TCKNR/L (75°) and neutral inserts TCMNN, PCMNN (50°) and TCZNN (40°) with shank cross sections of 16×16–40×40 mm; for internal turning, boring bars S20R–S50V with a TCLNR/L or PCLNR/L head.

Only in corner radius: 0.4 mm is used for finishing at low feed rates, 0.8 mm is the general-purpose version, and 1.2 mm is selected for roughing at higher feed rates. The remaining dimensions (IC 12.7 mm, thickness 4.76 mm) are identical.

Yes — grade H6310 covers group ISO M20-M40. Maintain a cutting speed of 55–320 m/min, a constant feed, and continuous emulsion cooling: austenitic steel conducts heat poorly and work-hardens when cutting is too slow.

Product accessories

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Pin CTM617 Varel

Reference: 0000011972 In stock > 10 items

€1.05

€1.29 brutto

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Carbide insert CNMG 120408 HS H6310 Horn

Carbide insert CNMG 120408 HS H6310 Horn

Shipping

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