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Description
VCMT 160404 turning insert – 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 | 0.4 mm |
| ANSI code | VCMT 331 |
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 | 0.05 | 0.1 | 180-270 | 0.1 | 0.32 | 170-220 | 0.2 | 1.8 |
| MStainless steel | 125-260 | 0.05 | 0.1 | 100-220 | 0.1 | 0.32 | 80-200 | 0.2 | 1.8 |
Positive H6310 cemented carbide insert – applications and design
single-sided 35° diamond, positive geometry with a chip breaker
The VCMT 160404 turning insert is a single-sided, indexable diamond insert made of grade H6310 cemented carbide, designed for finish turning of steel and stainless steel. The V shape, a diamond with a 35° corner angle, facilitates profiling, contour copying and access to narrow workpiece features. The positive geometry with a 7° clearance angle reduces cutting forces, making the insert suitable for slender shafts and thin-walled components. The insert uses one side and provides two cutting edges, secured by a screw through a countersunk hole. The nose radius rε of 0.4 mm ensures low surface roughness at low feed rates.
Key advantages of the H6310 cemented carbide insert
- Two cutting edges — single-sided positive insert with two 35° corners; the sharp tip facilitates profiling and contour copying.
- Grade H6310 for ISO groups P and M — PVD-coated carbide for steel (P20-P40) and stainless steel (M20-M40), and occasionally cast iron.
- Corner radius rε 0.4 mm — finishing with low surface roughness at low feed rates.
- The positive geometry with a 7° clearance angle reduces cutting forces and power consumption when turning slender workpieces.
- Screw clamping through the countersunk hole ensures secure, repeatable seating of the insert in the holder pocket.
- 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 data selection for the diamond-shaped insert
The VCMT 160404 insert (also written without a space as vcmt160404) is suitable for finish turning of shafts, bushings and profiled components made of structural steels and stainless steel. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft with a diameter of 30 mm at Vc = 300 m/min, the result is approximately 3183 rpm. The sharp 35° tip and small contact area limit radial forces, reducing deflection of long workpieces and vibration. The countersunk hole allows secure screw clamping of the insert and facilitates unobstructed chip flow during copy turning. Grade H6310 with a PVD coating covers ISO groups P20-P40 and M20-M40, allowing steel and stainless steel to be machined with the same cutting insert.
When machining stainless steels, maintain a cutting speed of 80–260 m/min and a constant feed rate to avoid work hardening of the layer being cut. The positive geometry and 0.4 mm radius perform best at feed rates up to 0.2 mm/rev and shallow depths of cut typical of finishing operations. For structural steels, use higher speeds within the 250–350 m/min range, which provide a smooth surface and consistent cutting edge life at low feed rates. For semi-finishing, select a variant with a larger nose radius from the same family. Grade H6310 indexable inserts are supplied by the Korean brand Horn.
▲
Application limitation
The sharp 35° tip and small nose radius 0.4 mm limit the insert to finishing and semi-finishing operations — avoid rough turning and interrupted turning with heavy stock removal to prevent corner chipping. For hardened steels above 45 HRC choose a version with a cutting edge CBN made of cubic boron nitride.
Rhombic insert designation decoder according to ISO 1832
how to read the VCMT 160404 code — designation positions 1–7
Designation VCMT 160404 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
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 160404 insert
use, turning tool selection, and turning parameters
Two — the 35° diamond has 2 corners, while the positive (single-sided) geometry uses only the upper rake face. Once one cutting edge becomes dull, simply index the insert in the pocket to use the second corner without changing the holder.
Holders with a 16 diamond-shaped pocket (IC 9.525 mm): for external turning SVHCR/L (entering angle 107.5°), SVJCR/L (93°) and neutral SVVCN (72.5°) with shank cross sections of 20×20–32×32 mm; for boring, boring bars S25S–S40U with an SVUCR/L or SVQCR/L head.
Primarily in the nose radius rε: 0.4 mm on VCMT 160404 is used for finishing at low feed rates and provides low surface roughness, while larger radii, e.g. 0.8 mm, are selected for semi-finishing and 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 80–260 m/min, a constant feed rate and continuous emulsion cooling; the insert's positive geometry reduces cutting forces and limits work hardening of austenitic steel.
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