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Description
VNMG 160408 turning insert – indexable 35° rhombus
| Technical data | |
|---|---|
| Side length l | 16.6 mm |
| Insert thickness s | 4.76 mm |
| Hole diameter d1 | 3.81 mm |
| Corner radius rε | 0.8 mm |
| ANSI code | VNMG 332 |
Cutting data for the VNMG insert for steel and stainless steel
finishing, semi-finishing and roughing — ISO P and M groups
| Material | Finishing | Semi-finishing | Roughing | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 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 | 200-295 | 0.15 | 1 | 170-240 | 0.3 | 3 | 150-215 | 0.5 | 4 |
| MStainless steel | 110-230 | 0.15 | 1 | 70-175 | 0.3 | 3 | 50-135 | 0.5 | 4 |
Grade H6310 cemented carbide indexable insert – applications and construction
double-sided 35° diamond with a hole and chip breaker
The VNMG 160408 turning insert is a double-sided, diamond-shaped indexable insert made of grade H6310 cemented carbide, designed for turning steel and stainless steel. Shape V, a diamond with a 35° corner angle, provides an exceptionally sharp tip that reaches into narrow profiles and facilitates following the workpiece contour. The negative geometry with a 0° clearance angle allows both sides of the insert to be used — a total of four cutting edges. The sharp corner angle reduces radial forces, making the tool suitable for turning slender shafts without deflecting the material. The hole and chip breakers on both sides (type G according to ISO 1832) control chip flow and chip breaking.
Grade H6310 is a PVD-coated cemented carbide classified in ISO groups P20–P40 and M20–M40. The PVD coating withstands fluctuating thermal loads and performs well at the moderate speeds typical of stainless steel machining. The same grade can also occasionally machine cast iron, making it a versatile choice for workshops handling a variety of materials. Tolerance class M ensures repeatable cutting edge positioning after indexing the insert in the holder pocket, without resetting the turning tool.
Key advantages of the H6310 cemented carbide insert
- Four cutting edges — 2 corners of 35° 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.
- Sharp 35° corner — reaches into narrow profiles and enables profile turning and contour copying without changing the tool.
- The rε 0.8 mm corner radius combines surface finish with tip strength in semi-finishing.
- Dimensions according to ISO 1832: edge length 16.6 mm, IC 9.525 mm (3/8″), thickness 4.76 mm — fit holders with a 16 pocket.
- The low radial forces of the sharp corner reduce vibration and deflection when turning slender workpieces.
Applications and cutting data selection for the diamond-shaped insert
The VNMG 160408 insert (also written without spaces as vnmg160408) is suitable for profile turning, copy turning, and contour finishing on structural steel parts and stainless steel components. Calculate spindle speed using the formula n = 1000·Vc/(π·D): for a shaft diameter of 50 mm at Vc = 200 m/min, the result is approximately 1273 rpm. For stainless steel, maintain a cutting speed of 50–230 m/min and a constant feed rate to avoid work hardening of the layer being cut. The rε 0.8 mm corner radius combines a good surface finish with tip strength at feed rates of 0.15–0.3 mm/rev. Grade H6310 indexable inserts are supplied by the Korean brand Horn.
▲
Application limitation
The sharp tip 35° is sensitive to overload and high temperatures — avoid heavy roughing and interrupted cutting, which can chip the corner. Grade H6310 is not intended for hardened steels above 45 HRC — for hard turning, choose an insert with a cubic boron nitride cutting edge CBN.
Rhombic insert designation decoder according to ISO 1832
how to read the VNMG 160408 code — positions 1–7 of the designation
Designation VNMG 160408 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 16 diamond pocket — external turning and boring
TVJNR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
TVJNR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
TVJNR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
TVJNR/L 4040 S1640×40 × 250 mmR right-hand
←L left-hand
→
←L left-hand
→
TVHNR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
TVHNR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
TVHNR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
TVVNN 2020 K1620×20 × 125 mmNeutral
↔
↔
TVVNN 2525 M1625×25 × 150 mmNeutral
↔
↔
TVVNN 3232 P1632×32 × 170 mmNeutral
↔
↔
TVVNN 4040 S1640×40 × 250 mmNeutral
↔
↔
S25S TVUNR/L-16Ø25 × 250 mmR right-hand
←L left-hand
→
←L left-hand
→
S32T TVUNR/L-16Ø32 × 300 mmR right-hand
←L left-hand
→
←L left-hand
→
S40U TVUNR/L-16Ø40 × 350 mmR right-hand
←L left-hand
→
←L left-hand
→
S50V TVUNR/L-16Ø50 × 400 mmR right-hand
←L left-hand
→
←L left-hand
→
Frequently asked questions about the VNMG 160408 insert
use, turning tool selection, and turning parameters
Four — the 35° diamond has 2 corners per side, and the negative geometry (0° clearance angle) allows both sides of the insert to be used. Once the tip becomes dull, simply index the insert in its pocket without changing the holder.
Holders with a 16 diamond-shaped pocket (IC 9.525 mm): for external turning TVJNR/L (entering angle 93°), TVHNR/L (107.5°) and neutral TVVNN (72.5°) with shank cross sections of 20×20–40×40 mm; for boring, boring bars S25S–S50V with the TVUNR/L designation suffix (Ø25–Ø50 mm).
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 9.525 mm, thickness 4.76 mm) are identical.
Yes — grade H6310 covers group ISO M20-M40. Maintain a cutting speed of 50–230 m/min, a constant feed, and continuous emulsion cooling: austenitic steel conducts heat poorly and work-hardens when cutting is too slow.
Product accessories
Carbide insert VNMG 160404 HS H6310 Horn
Reference: 0000009634 In stock > 10 items
€7.11
€8.74 brutto
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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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