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Carbide insert SNMG 120408 MA H6310 Horn - Turning inserts
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  • Carbide insert SNMG 120408 MA H6310 Horn - Turning inserts
  • Carbide insert SNMG 120408 MA H6310 Horn - Turning inserts - nr. 2
Horn

Carbide insert SNMG 120408 MA H6310 Horn

Horn Horn
0000002922
€6.47 tax inc.

Net price: €5.26

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

Description

SNMG 120408 turning insert – indexable 90° square

Technical data
Side length l 12.7 mm
Insert thickness s 4.76 mm
Hole diameter d1 5.16 mm
Corner radius rε 0.8 mm
ANSI code SNMG 432
SNMG 120408 indexable turning insert made of H6310 cemented carbide, double-sided 90° square with a hole and chip breaker

Cutting data for the SNMG 120408 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 90° square with a hole and chip breaker

The SNMG 120408 turning insert is a double-sided, indexable square insert made of grade H6310 cemented carbide, designed for turning steel and stainless steel. The S shape, a square with a 90° corner angle, provides a strong corner that withstands loads in roughing and semi-finishing. The negative geometry with a 0° clearance angle allows both sides of the insert to be used — a total of eight cutting edges. The nose radius rε of 0.8 mm combines a good surface finish with cutting edge strength at feed rates of 0.22–0.44 mm/rev. The hole and chip breaker on both sides (type G according to ISO 1832) control chip flow and chip breaking. Tolerance class M provides intermediate accuracy of the inscribed circle IC, sufficient for most turning operations.

Key advantages of the H6310 cemented carbide insert

  • Eight cutting edges — 4 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 0.8 mm — general-purpose variant combining roughing and semi-finishing without changing the insert.
  • The 90° square corner is shorter and more rigid than that of triangular inserts, allowing it to withstand greater depths of cut.
  • Dimensions conform to ISO 1832: side length 12.7 mm, IC 12.7 mm (1/2″), thickness 4.76 mm — compatible with holders with a 12 pocket.
  • Tolerance class M provides repeatable cutting edge positioning after indexing the insert in the holder pocket.

Square insert applications and cutting data selection

Grade H6310 is a PVD-coated cemented carbide suitable for general-purpose use in ISO groups P20–P40 and M20–M40. The PVD coating increases wear and heat resistance, extending cutting edge life during continuous turning. The commercial suffix MA in the product name is a catalog designation and does not change the insert geometry. The double-sided design with eight corners significantly reduces the cost per cutting edge. The insert is also suitable for occasional cast iron turning, although steels remain its primary application.

The SNMG 120408 insert (also written without a space as snmg120408) is suitable for turning shafts, bushings and flanges made of structural steels, as well as stainless steel components. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft with a diameter of 60 mm at Vc = 250 m/min, the result is approximately 1326 rpm. When machining stainless steels, maintain a cutting speed in the 55–320 m/min range and a constant feed rate to avoid work hardening of the layer being cut. The square shape with a short cutting edge withstands interrupted cuts and vibration well on rigid workpieces. Grade H6310 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, choose an insert with a cubic boron nitride cutting edge CBN or a ceramic grade.

Square insert designation decoder according to ISO 1832

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

Designation SNMG 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

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

Positions 1–4 · ISO code

1SShape

Square 90°

4 corners of 90° 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

708Corner radius

rε = 0.8 mm

code ÷ 10 → radius in mm

✓ 4 corners × 2 sides = 8 cutting edges

Full designation: SNMG 120408 = square 90° · negative · class M · hole and chip breaker · IC 12.7 mm (l 12.7 mm) · s 4.76 mm · rε 0.8 mm

Compatible turning tools

holders with a 12 square pocket — external and internal turning

TSSNR/L 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
TSSNR/L 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
TSSNR/L 3232 P1232×32 × 170 mmR right-hand
←L left-hand
→
TSDNN 2020 K1220×20 × 125 mmNeutral
↔
TSDNN 2525 M1225×25 × 150 mmNeutral
↔
TSDNN 3232 P1232×32 × 170 mmNeutral
↔
TSKNR/L 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
TSKNR/L 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
TSKNR/L 3232 P1232×32 × 170 mmR right-hand
←L left-hand
→
PSSNR/L 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
PSSNR/L 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
PSSNR/L 3232 P1232×32 × 170 mmR right-hand
←L left-hand
→
PSDNN 2020 K1220×20 × 125 mmNeutral
↔
PSDNN 2525 M1225×25 × 150 mmNeutral
↔
PSDNN 3232 P1232×32 × 170 mmNeutral
↔
PSKNR/L 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
PSKNR/L 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
PSKNR/L 3232 P1232×32 × 170 mmR right-hand
←L left-hand
→
PSBNR/L 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
PSBNR/L 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
PSBNR/L 3232 P1232×32 × 170 mmR right-hand
←L left-hand
→
PSSNR/L-PH 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
PSSNR/L-PH 2525 M1225×25 × 150 mmR right-hand
←L left-handI
PSKNR/L-PH 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
PSKNR/L-PH 3232 P1232×32 × 170 mmR right-hand
←L left-hand
→
PSBNR/L-PH 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
PSBNR/L-PH 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
PSBNR/L-PH 3232 P1232×32 × 170 mmR right-hand
←L left-hand
→
S25S TSKNR/L-12Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
S32T TSKNR/L-12Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
S40U TSKNR/L-12Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
S50V TSKNR/L-12Ø50 | Ømin 63 mm | L=400R right-hand
←L left-hand
→
A25R PSKNR/L-12Ø25 | Ømin 32 mm | L=200R right-hand
←L left-hand
→
A32S PSKNR/L-12Ø32 | Ømin 40 mm | L=250R right-hand
←L left-hand
→
S25S PSKNR/L-12Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
S32T PSKNR/L-12Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
S40U PSKNR/L-12Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→

Frequently asked questions about the SNMG 120408 insert

use, turning tool selection, and turning parameters

Eight — a square has 4 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 square 12 pocket (IC 12.7 mm): for external turning PSKNR/L, PSBNR/L and TSKNR/L (entering angle 75°) and PSSNR/L, PSDNN, TSSNR/L and TSDNN (45°) with shank cross sections of 20×20–32×32 mm; for internal turning, boring bars S25S–S50V and A25R–A32S with a TSKNR/L or PSKNR/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.

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Carbide insert SNMG 120408 MA H6310 Horn

Carbide insert SNMG 120408 MA H6310 Horn

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