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Carbide insert CNMG 120412 MA H6310 - Carbide insert lathe
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  • Carbide insert CNMG 120412 MA H6310 - Carbide insert lathe
  • Carbide insert CNMG 120412 MA H6310 - Carbide insert lathe - nr. 2
Horn

Carbide insert CNMG 120412 MA H6310 Horn

Horn Horn
004956
Cutting edge length: 122 sizes of this insert
1219
€7.77 tax inc.

Net price: €6.32

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W magazynie: 10-100 szt.
W magazynie: 10-100 szt.

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

Description

CNMG 120412 turning insert – indexable 80° diamond

Technical data
Side length l 12.7 mm
Insert thickness s 4.76 mm
Hole diameter d1 5.16 mm
Corner radius rε 1.2 mm
ANSI code CNMG 433
CNMG 120412 indexable turning insert made of H6310 cemented carbide, double-sided 80° diamond with a hole and chip breaker

Cutting data for the CNMG 120412 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

H6310 carbide indexable insert – applications and construction

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

The CNMG 120412 turning insert is a double-sided, rhombic indexable insert made of grade H6310 cemented carbide, designed for turning steel and stainless steel. Shape C, a rhombus with a 80° corner angle, combines a rigid, strong corner with good clearance during longitudinal turning and facing. The negative geometry with a 0° clearance angle allows both sides of the insert to be used — providing a total of four cutting edges. The mounting hole with a double-sided chip breaker (type G according to ISO 1832) controls chip flow and breaking during continuous cutting. The corner radius rε of 1.2 mm and thickness s of 4.76 mm provide the cutting edge with additional strength for roughing with a large chip cross section.

Key advantages of the H6310 cemented carbide insert

  • Four cutting edges — 2 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.
  • Corner radius rε 1.2 mm — the robust corner strengthens the cutting edge and supports roughing at feed rates up to 0.44 mm/rev.
  • Tolerance class M provides repeatable cutting edge positioning after indexing the insert in the holder pocket.
  • Dimensions according to ISO 1832: edge length 12.7 mm, IC 12.7 mm (1/2″), thickness 4.76 mm — fit holders with a 12 pocket.
  • A 80° corner angle provides a rigid, load-resistant corner for longitudinal and facing passes without changing tools.

Applications and cutting data selection for the diamond-shaped insert

The CNMG 120412 insert (also written without a space as cnmg120412) is suitable for roughing and semi-finishing shafts, bushings, and flanges made of structural steels, as well as stainless steel components. The 80° corner angle allows one cutting edge to machine both cylindrical surfaces and faces, reducing the number of tool changes in the cycle. Calculate spindle speed using the formula n = 1000·Vc/(π·D): for a shaft diameter of 80 mm at Vc = 200 m/min, the result is approximately 796 rpm. For workpieces with varying cross sections, maintain a constant surface speed by adjusting spindle speed after each change in diameter.

The 1.2 mm corner radius is best utilized at greater depths of cut ap and feed rates of 0.22–0.44 mm/rev, where the large corner dissipates heat and resists chipping. For stainless steels, maintain a cutting speed of 55–320 m/min and a constant, uninterrupted feed to avoid work hardening of the layer being cut and accelerated cutting edge wear. Rigid workpiece clamping and short holder overhang reduce vibration with such a large corner radius. For finishing passes, select a smaller radius from the same family, such as 0.4 or 0.8 mm. Indexable inserts in grade H6310 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 120412 with a cubic boron nitride (CBN) cutting edge.

Rhombic insert designation decoder according to ISO 1832

how to read the CNMG 120412 code — positions 1–7 of the designation

Designation CNMG 120412 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 712radius 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 = 12.7 mm

IC = 12.7 mm · 1/2″

604Thickness

s = 4.76 mm

between rake faces

712Corner radius

rε = 1.2 mm

code ÷ 10 → radius in mm

✓ 2 corners × 2 sides = 4 cutting edges

Full designation: CNMG 120412 = 80° diamond · negative · class M · hole and chip breaker · IC 12.7 mm (l 12.7 mm) · s 4.76 mm · rε 1.2 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 120412 insert

use, turning tool selection, and turning parameters

Four — the diamond has 2 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, PCMNN, TCMNN, TCZNN and TCKNR/L 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 feed rates up to 0.44 mm/rev. 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.

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Carbide insert CNMG 120412 MA H6310 Horn

Carbide insert CNMG 120412 MA H6310 Horn

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