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CNMG 120404 HS H6310 insert Horn - Turning inserts
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  • CNMG 120404 HS H6310 insert Horn - Turning inserts
  • CNMG 120404 HS H6310 insert Horn - Turning inserts - nr. 2
Horn

Carbide insert CNMG 120404 HS H6310 Horn

Horn Horn
10055
€7.12 tax inc.

Net price: €5.79

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

Description

CNMG 120404 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 0.4 mm
ANSI code CNMG 431
CNMG 120404 indexable turning insert made of H6310 cemented carbide, double-sided 80° diamond with a hole and chip breaker

Cutting data for the CNMG 120404 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 120404 turning insert is a double-sided, diamond-shaped indexable insert made of grade H6310 cemented carbide, intended for turning steel and stainless steel. Shape C denotes a diamond with a 80° corner angle — the substantial, rigid corner withstands varying loads during longitudinal turning, facing, and light profiling. The negative geometry with a 0° clearance angle allows both sides of the insert to be used, providing four cutting edges at two 80° corners. The nose radius rε 0.4 mm is suitable for finishing and semi-finishing at low feed rates, ensuring a smooth workpiece surface. The hole with a chip breaker on both sides, designated by the letter G according to ISO 1832, allows screw clamping and controls chip flow and breaking.

Key advantages of the H6310 cemented carbide insert

  • Four cutting edges — 2 corners of 80° 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 — PVD-coated carbide: steel (P20-P40) and stainless steel (M20-M40), occasionally also cast iron.
  • Corner radius rε 0.4 mm — finishing and semi-finishing at low feed rates, a smooth surface without secondary machining.
  • The 80° diamond shape combines a strong corner with the ability to perform longitudinal turning and facing with one tool.
  • Dimensions according to ISO 1832: edge length 12.9 mm, IC 12.7 mm (1/2″), thickness 4.76 mm — fit holders with a size 12 C pocket.
  • Tolerance class M provides repeatable cutting edge positioning after indexing the insert in the holder pocket.

Applications and cutting data selection for the diamond-shaped insert

The CNMG 120404 insert (also written without spaces as cnmg120404) performs well when turning shafts, bushings, and flanges made of structural steels, as well as stainless steel components — it is a typical insert for indexable turning tools for external and internal turning. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft with a diameter of 40 mm at a cutting speed Vc = 250 m/min, the result is approximately 1990 rpm. The smaller nose radius of 0.4 mm reduces radial forces and the tendency to vibrate, making this version well suited to slender workpieces and finishing passes.

For austenitic stainless steels, maintain a cutting speed of 55–320 m/min, a constant feed rate, and continuous coolant flow to limit work hardening and remove heat from the layer being cut. In structural steels, grade H6310 also performs efficiently in semi-finishing at a feed rate of 0.22–0.44 mm/rev, removing 1–4 mm of stock in a single pass. The PVD coating increases the cutting edge's resistance to abrasion and heat, extending edge life between indexing operations. Grade H6310 cemented carbide indexable inserts are supplied by the Korean brand Horn.

▲
Application limitation

Grade H6310 is not intended for steels hardened above 45 HRC — for hard turning, select the version CNMG 120404 CBN with a cubic boron nitride cutting edge.

Rhombic insert designation decoder according to ISO 1832

how to read the CNMG 120404 code — positions 1–7 of the designation

Designation CNMG 120404 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 704radius 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

704Corner radius

rε = 0.4 mm

code ÷ 10 → radius in mm

✓ 2 corners × 2 sides = 4 cutting edges

Full designation: CNMG 120404 = 80° diamond · negative · class M · hole and chip breaker · IC 12.7 mm (l 12.9 mm) · s 4.76 mm · rε 0.4 mm

Compatible turning tools

holders with a size 12 diamond-shaped C 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 120404 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 size 12 diamond-shaped C pocket (IC 12.7 mm): for external turning TCLNR/L and PCLNR/L (entering angle 95°), PCBNR/L and TCKNR/L (75°) and PCMNN, TCMNN and TCZNN with 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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Reference: 0000011972 In stock > 10 items

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Carbide insert CNMG 120404 HS H6310 Horn

Carbide insert CNMG 120404 HS H6310 Horn

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