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Carbide insert WNMG 080408 for hardened materials Horn
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  • Carbide insert WNMG 080408 for hardened materials Horn
  • Carbide insert WNMG 080408 for hardened materials Horn - nr. 1
Horn

Carbide insert WNMG 080408 CBN H6310 Horn

Horn Horn
0000010751
Cutting edge length: 082 sizes of this insert
0608
€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

WNMG 080408 turning insert – indexable 80° trigon

Technical data
Side length l 8.07 mm
Insert thickness s 4.76 mm
Hole diameter d1 5.16 mm
Corner radius rε 0.8 mm
ANSI code WNMG 432
WNMG 080408 CBN H6310 borazon indexable turning insert, double-sided 80° trigon with a hole and chip breaker for hard turning

CBN H6310 borazon insert – applications and design

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

The WNMG 080408 turning insert is a double-sided indexable insert with an H6310 grade CBN borazon tip, designed for turning hardened and difficult-to-machine materials above 45 HRC. The W shape, a trigon with a 80° corner angle, combines the strength of a substantial corner with the ability to perform longitudinal turning and facing. Negative geometry with a 0° clearance angle allows both sides of the insert to be used — a total of six cutting edges. The nose radius rε 0.8 mm is a general-purpose variant that balances surface finish with edge durability in hard material.

The tip made of cubic boron nitride, or borazon, is the second-hardest cutting tool material after diamond, so the insert retains a sharp edge where carbide quickly dulls. It is suitable for turning hardened tool and bearing steels, chilled cast irons and hardfaced layers with a hardness of 45 to 65 HRC. The closed, substantial WNMG trigon profile effectively dissipates heat from the cutting zone and reduces the risk of corner chipping under high pressure. The mounting hole and double-sided chip breaker (type G per ISO 1832) control the evacuation of small, hard chips produced when machining hardened materials.

Key features of the CBN H6310 borazon insert

  • Six cutting edges — 3 corners on each of the two sides reduce the cost per cutting edge compared with single-sided inserts.
  • CBN tip, or cubic boron nitride — hardness second only to diamond enables hard turning of hardened steels and chilled cast irons above 45 HRC.
  • Corner radius rε 0.8 mm — a general-purpose balance between surface finish and edge strength in finishing and semi-finishing.
  • The substantial 80° trigon withstands higher forces and vibration than the more slender C or D shapes — promoting stable machining in hard material.
  • Tolerance class M provides repeatable edge positioning after indexing the insert in the pocket, without tool offset adjustment.
  • Dimensions conforming to ISO 1832: IC 12.7 mm (1/2″), thickness 4.76 mm — fit holders with a size 08 trigon pocket.

Cutting parameter selection and hard turning

The WNMG 080408 insert (also written without a space as wnmg080408) can often replace grinding of shafts, sleeves and rings after hardening, shortening cycle times and simplifying workpiece clamping. Calculate spindle speed using n = 1000·Vc/(π·D): for example, at a cutting speed Vc = 150 m/min and a workpiece diameter D = 50 mm, the result is approximately 955 rpm. Perform hard turning on a rigid machine free of mechanical play, using a low feed rate and a shallow depth of cut to protect the delicate borazon edge from overload. Indexable inserts for hardened materials in this range are supplied by the Korean brand Horn.

▲
Application limitation

The tip CBN is designed for hardened materials above 45 HRC and requires rigid, stable clamping. It is not cost-effective for turning soft, unhardened steel and wears faster — use a cemented carbide insert in this case.

Trigon insert designation decoder according to ISO 1832

how to read the WNMG 080408 code — positions 1–7 of the designation

Designation WNMG 080408 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

1Wshape 2Nangle α 3Mtolerance 4Gtype – 508size 604thickness 708radius rε

Positions 1–4 · ISO code

1WShape

80° trigon

3 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]

508Size

l = 8.7 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

✓ 3 corners × 2 sides = 6 cutting edges

Full designation: WNMG 080408 = 80° trigon · negative · class M · hole and chip breaker · IC 12.7 mm (l 8.7 mm) · s 4.76 mm · rε 0.8 mm

Compatible turning tools

holders with a 08 trigon pocket — external and internal turning

TWLNR/L 2020 K0820×20 × 125 mmR right-hand
←L left-hand
→
TWLNR/L 2525 M0825×25 × 150 mmR right-hand
←L left-hand
→
TWLNR/L 3232 P0832×32 × 170 mmR right-hand
←L left-hand
→
TWLNR/L 4040 S0840×40 × 250 mmR right-hand
←L left-hand
→
PWLNR/L 2020 K0820×20 × 125 mmR right-hand
←L left-hand
→
PWLNR/L 2525 M0825×25 × 150 mmR right-hand
←L left-hand
→
PWLNR/L 3232 P0832×32 × 170 mmR right-hand
←L left-hand
→
PWLNR/L 4040 S0840×40 × 250 mmR right-hand
←L left-hand
→
MWLNR/L 2020 K0820×20 × 125 mmR right-hand
←L left-hand
→
MWLNR/L 2525 M0825×25 × 150 mmR right-hand
←L left-hand
→
MWLNR/L 3232 P0832×32 × 170 mmR right-hand
←L left-hand
→
MWLNR/L 4040 S0840×40 × 170 mmR right-hand
←L left-hand
→
MWDNN 2020 K0820×20 × 125 mmR right-hand
←L left-hand
→
MWDNN 2525 M0825×25 × 150 mmR right-hand
←L left-hand
→
MWDNN 3232 P0832×32 × 170 mmR right-hand
←L left-hand
→
MWDNN 4040 S0840×40 × 170 mmR right-hand
←L left-hand
→
S25S TWLNR/L-08Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
S32T TWLNR/L-08Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
S40U TWLNR/L-08Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
S50V TWLNR/L-08Ø50 | Ømin 63 mm | L=400R right-hand
←L left-hand
→
S25S PWLNR/L-08Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
S32T PWLNR/L-08Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
S40U PWLNR/L-08Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
S50V PWLNR/L-08Ø50 | Ømin 63 mm | L=400R right-hand
←L left-hand
→
S25S MWLNR/L-08Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
S32T MWLNR/L-08Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
S40U MWLNR/L-08Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
S50V MWLNR/L-08Ø50 | Ømin 63 mm | L=400R right-hand
←L left-hand
→

Frequently asked questions about the WNMG 080408 insert

handling, turning tool selection, and hard turning

Six — the trigon has 3 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 08 trigon pocket (IC 12.7 mm): for external turning TWLNR/L, PWLNR/L and MWLNR/L (entering angle 95°) and MWDNN (50°) with shank cross sections of 20×20–40×40 mm; for internal turning, boring bars S25S–S50V with the suffix TWLNR/L, PWLNR/L, or MWLNR/L.

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 heavier machining at higher feed rates. The other dimensions (IC 12.7 mm, thickness 4.76 mm) are identical.

It is not cost-effective — the tip CBN was developed for hardened steels and hard materials above 45 HRC. In soft, unhardened steel, borazon wears faster and costs more than carbide, so choose a cemented carbide insert for these materials.

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Carbide insert WNMG 080408 CBN H6310 Horn

Carbide insert WNMG 080408 CBN H6310 Horn

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