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Description
VCMT 160408 turning insert – single-sided 35° diamond
| Technical data | |
|---|---|
| Side length l | 16.5 mm |
| Insert thickness s | 4.76 mm |
| Hole diameter d1 | 4.4 mm |
| Corner radius rε | 0.8 mm |
| ANSI code | VCMT 332 |
Cutting data for the VCMT 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 | 250-350 | 0.07 | 0.14 | 180-270 | 0.14 | 0.32 | 170-220 | 0.27 | 1.8 |
| MStainless steel | 125-260 | 0.07 | 0.14 | 100-220 | 0.14 | 0.32 | 80-200 | 0.27 | 1.8 |
H6310 carbide indexable insert – applications and construction
single-sided 35° diamond with a hole, countersink and chip breaker
The VCMT 160408 turning insert is a single-sided indexable insert made of H6310 grade cemented carbide, designed for turning steel and stainless steel. The V shape, a diamond with an acute 35° corner angle, facilitates copy machining and access to narrow, inclined sections of the workpiece contour. Positive geometry with a 7° clearance angle reduces cutting resistance, making the insert suitable for finishing and light longitudinal turning of slender components. The recessed hole and single-sided chip breaker control chip flow and breaking, while the acute diamond provides two cutting edges on one side. The PVD coating of grade H6310 covers ISO P and M groups, so one insert handles most light turning tasks in the shop.
Key advantages of the H6310 cemented carbide insert
- Two cutting edges — 2 corners of 35° each on one side of the insert; an acute diamond for finishing and profile copying.
- Grade H6310 for ISO groups P and M — PVD-coated carbide: steel (P20-P40) and stainless steel (M20-M40), occasionally also cast iron.
- Corner radius rε 0.8 mm — a general-purpose variant combining surface finish with corner strength.
- Positive geometry with a 7° clearance angle reduces cutting forces and limits vibration on slender workpieces prone to deflection.
- The acute 35° corner angle provides access to copied and inclined contours that a 55° or 80° diamond-shaped insert cannot reach.
- Dimensions according to ISO 1832: edge length 16.5 mm, IC 9.525 mm (3/8″), thickness 4.76 mm — fit holders with a 16 pocket.
Applications and cutting parameter selection for the 35° diamond-shaped insert
The VCMT 160408 insert (also written without a space as vcmt160408) is suitable for finishing shafts, journals and copied profiles made of structural steels, as well as stainless steel components. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft diameter of 40 mm at Vc = 250 m/min, the result is approximately 1989 rpm. When machining stainless steels, maintain a cutting speed of 80–260 m/min and a constant feed to avoid work hardening of the layer being cut. The acute 35° corner angle is sensitive to overload, so select a shallow depth of cut and feed rates within the precision machining range. H6310 grade inserts for turning tools are supplied by the Korean brand Horn.
In the VCMT 1604 family, the nose radius determines the application: 0.4 mm for finishing, 0.8 mm for general-purpose use and 1.2 mm for slightly higher feed rates; the variant described here, with rε 0.8 mm, is the most frequently selected turning insert. Tolerance class M ensures repeatable edge positioning after indexing the insert in the pocket, reducing tool setup time between operations. Positive geometry and a thin chip limit heat buildup in the cutting zone, making the insert suitable for thin-walled sleeves prone to deformation and vibration as well.
▲
Application limitation
The acute 35° diamond and positive geometry are intended for finishing and semi-finishing — for rough turning with a large machining allowance, select a stronger shape, such as a diamond CNMG or a triangle TNMG. Grade H6310 does not cover hardened steels above 45 HRC.
Rhombic insert designation decoder according to ISO 1832
how to read the VCMT 160408 code — designation positions 1–7
Designation VCMT 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 V-shaped diamond pocket — external turning and boring
SVJCR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
SVJCR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
SVJCR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
SVHCR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
SVHCR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
SVHCR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
SVVCN 2020 K1620×20 × 125 mmNeutral
↔
↔
SVVCN 2525 M1625×25 × 150 mmNeutral
↔
↔
SVVCN 3232 P1632×32 × 170 mmNeutral
↔
↔
S25S SVUCR/L-16Ø25 × 250 mmR right-hand
←L left-hand
→
←L left-hand
→
S25S SVUCR/L-16SØ25 × 250 mmR right-hand
←L left-hand
→
←L left-hand
→
S32T SVUCR/L-16Ø32 × 300 mmR right-hand
←L left-hand
→
←L left-hand
→
S40U SVUCR/L-16Ø40 × 350 mmR right-hand
←L left-hand
→
←L left-hand
→
S25S SVQCR/L-16Ø25 × 250 mmR right-hand
←L left-hand
→
←L left-hand
→
S25S SVQCR/L-16SØ25 × 250 mmR right-hand
←L left-hand
→
←L left-hand
→
S32T SVQCR/L-16Ø32 × 300 mmR right-hand
←L left-hand
→
←L left-hand
→
S40U SVQCR/L-16Ø40 × 350 mmR right-hand
←L left-hand
→
←L left-hand
→
Frequently asked questions about the VCMT 160408 insert
use, turning tool selection, and turning parameters
Two — the acute diamond has 2 corners of 35° each, and the positive, single-sided geometry (7° clearance angle) allows only one side of the insert to be used. Once one corner is worn, simply rotate the insert in the pocket to the other corner, without changing the holder.
Holders with a V-shaped diamond pocket in size 16 (IC 9.525 mm): for external turning SVJCR/L (entering angle 93°), SVHCR/L (107.5°) and neutral SVVCN with shank cross sections of 20×20–32×32 mm; for boring, boring bars S25S–S40U with an SVUCR/L or SVQCR/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 slightly higher feed rates. The remaining dimensions (IC 9.525 mm, thickness 4.76 mm, 35° diamond) are identical.
Yes — grade H6310 covers group ISO M20-M40. Maintain a cutting speed of 80–260 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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