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Description
WNMG 080408 turning insert – indexable 80° trigon
| Technical data | |
|---|---|
| Side length l | 8.7 mm |
| Insert thickness s | 4.76 mm |
| Hole diameter d1 | 5.16 mm |
| Corner radius rε | 0.8 mm |
| Inscribed circle diameter IC | 12.7 mm |
| ANSI code | WNMG 432 |
Cutting data for the WNMG insert for aluminum and nonferrous metals
semi-finishing — ISO N materials
| Material | Semi-finishing | |
|---|---|---|
| Vc [m/min] | Feed f [mm/rev] | |
| NAluminum and nonferrous metals | 60-130 | 0.15 |
K10 carbide indexable insert – applications and design
double-sided 80° trigon with a hole and chip breaker
The WNMG 080408 turning insert is a double-sided, trigon-shaped indexable insert made of fine-grained grade K10 cemented carbide, designed for turning aluminum and other nonferrous metals. Shape W, a trigon with a 80° corner angle, combines strength similar to a square insert with better access to the workpiece contour. The negative geometry with a 0° clearance angle allows both sides of the insert to be used — a total of six cutting edges. The rε 0.8 mm nose radius and sharp, often polished cutting edge limit built-up edge and maintain a smooth surface at a feed rate of approximately 0.15 mm/rev. Tolerance class M ensures repeatable cutting edge positioning after indexing the insert in the holder seat.
Key benefits of the K10 carbide insert
- Six cutting edges — 3 corners on each of the two sides reduce the cost per cutting edge compared with single-sided inserts.
- K10 grade for nonferrous metals — fine-grained carbide maintains a sharp cutting edge when machining aluminum, brass, and bronze (ISO N materials).
- Corner radius rε 0.8 mm — a versatile balance between surface finish and corner strength.
- The sharp, polished, uncoated cutting edge reduces adhesion of soft aluminum chips to the rake face.
- The mounting hole for a pin ensures rigid and repeatable seating of the insert in the holder.
- The 80° corner angle provides a strong corner that withstands loads while maintaining good access to the workpiece contour.
Applications and cutting data selection for the trigon insert
The WNMG 080408 insert is suitable for turning shafts, bushings, flanges, and housings made of aluminum alloys, brass, and bronze on conventional and CNC lathes. Fine-grained K10 carbide maintains cutting edge sharpness, which is essential for soft, ductile nonferrous materials prone to built-up edge. The hole with a double-sided chip breaker (type G per ISO 1832) controls the flow of long, ductile aluminum chips and protects the machined surface from scratching. Flood cooling with emulsion or oil also flushes chips out of the cutting zone and stabilizes the cutting edge temperature. The trigon shape is suitable for longitudinal turning, facing, and light copy turning without changing the insert.
The WNMG 080408 insert (also written without a space as wnmg080408) operates at a cutting speed of 60–130 m/min and a feed rate of 0.15 mm/rev in semi-finishing. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft diameter of 40 mm at Vc = 130 m/min, the result is approximately 1035 rpm. For smaller diameters, increase spindle speed to maintain the recommended cutting speed and limit built-up edge. Excessively low cutting speed promotes built-up edge and reduces surface finish quality, so for small diameters it is advisable to approach the upper end of the Vc range. Indexable inserts in grade K10 are supplied by the Korean brand Horn.
▲
Application limitation
Grade K10 is intended for nonferrous metals (group ISO N). For turning structural steel or stainless steel, select an insert in a general-purpose grade from group ISO P/M — the sharp cutting edge for aluminum wears faster on steel materials.
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.
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
→
←L left-hand
→
TWLNR/L 2525 M0825×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
TWLNR/L 3232 P0832×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
TWLNR/L 4040 S0840×40 × 250 mmR right-hand
←L left-hand
→
←L left-hand
→
PWLNR/L 2020 K0820×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
PWLNR/L 2525 M0825×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
PWLNR/L 3232 P0832×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
PWLNR/L 4040 S0840×40 × 250 mmR right-hand
←L left-hand
→
←L left-hand
→
MWLNR/L 2020 K0820×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
MWLNR/L 2525 M0825×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
MWLNR/L 3232 P0832×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
MWLNR/L 4040 S0840×40 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
MWDNN 2020 K0820×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
MWDNN 2525 M0825×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
MWDNN 3232 P0832×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
MWDNN 4040 S0840×40 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
S25S TWLNR/L-08Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
←L left-hand
→
S32T TWLNR/L-08Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
←L left-hand
→
S40U TWLNR/L-08Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
←L left-hand
→
S50V TWLNR/L-08Ø50 | Ømin 63 mm | L=400R right-hand
←L left-hand
→
←L left-hand
→
S25S PWLNR/L-08Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
←L left-hand
→
S32T PWLNR/L-08Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
←L left-hand
→
S40U PWLNR/L-08Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
←L left-hand
→
S50V PWLNR/L-08Ø50 | Ømin 63 mm | L=400R right-hand
←L left-hand
→
←L left-hand
→
S25S MWLNR/L-08Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
←L left-hand
→
S32T MWLNR/L-08Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
←L left-hand
→
S40U MWLNR/L-08Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
←L left-hand
→
S50V MWLNR/L-08Ø50 | Ømin 63 mm | L=400R right-hand
←L left-hand
→
←L left-hand
→
Frequently asked questions about the WNMG 080408 insert
use, turning tool selection, and turning parameters
Six — the trigon has 3 corners per side, and the negative geometry (clearance angle 0°) allows both sides of the insert to be used. When a corner becomes dull, simply index the insert in the pocket without changing the holder.
Holders with a size 08 trigon insert seat: 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 roughing. The remaining dimensions (IC 12.7 mm, thickness 4.76 mm) are identical.
Grade K10 is intended for aluminum and nonferrous metals (group ISO N), and its sharp, uncoated cutting edge wears faster on steel. For turning structural or stainless steel, select a WNMG insert in a general-purpose grade from group ISO P/M.
Product accessories
Carbide insert WNMG 080404 MA H6310 Horn
Reference: 0000004240 In stock > 10 items
€5.26
€6.47 brutto
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Shipping
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| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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