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Description
CCMT 120404 turning insert – 80° rhombus with positive geometry
| Technical data | |
|---|---|
| Side length l | 12.9 mm |
| Insert thickness s | 4.76 mm |
| Hole diameter d1 | 5.5 mm |
| Corner radius rε | 0.4 mm |
| ANSI code | CCMT 431 |
Cutting data for the CCMT insert for steel and stainless steel
finishing and semi-finishing — ISO groups P and M
| Material | Finishing | Semi-finishing | ||||
|---|---|---|---|---|---|---|
| Vc [m/min] | Feed f [mm/rev] | ap [mm] | Vc [m/min] | Feed f [mm/rev] | ap [mm] | |
| PSteel | 130-200 | 0.05-0.15 | 0.1-1 | 130-200 | 0.12-0.21 | 0.5-3 |
| MStainless steel | 70-100 | 0.05-0.15 | 0.1-1 | 70-100 | 0.12-0.21 | 0.5-3 |
H6310 cemented carbide positive insert – applications and design
single-sided 80° diamond with a hole and chip breaker
The CCMT 120404 turning insert is a single-sided, rhombic indexable insert made of grade H6310 cemented carbide, designed for turning steel and stainless steel. The C shape, a rhombus with a corner angle of 80°, combines cutting edge strength with good access to contours during longitudinal turning, facing, and light profile turning. Positive geometry with a 7° clearance angle (letter C in the designation) reduces cutting resistance, so the insert performs well on slender shafts and when boring small diameters. The nose radius rε of 0.4 mm favors finishing and semi-finishing, providing low surface roughness at moderate feed rates. The mounting hole with a single-sided chip breaker (type T according to ISO 1832) controls chip flow and breaking on the working side of the insert.
Key advantages of the H6310 cemented carbide insert
- Two cutting edges — two 80° corners on one working side of the insert; positive geometry prevents use of the other side but keeps the cost per cutting edge low in finishing operations.
- 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 0.4 mm — finishing and semi-finishing with low surface roughness at low and medium feed rates.
- The positive clearance angle of 7° reduces cutting forces — less vibration on slender workpieces and when boring with long boring bars.
- Dimensions according to ISO 1832: edge length 12.9 mm, IC 12.7 mm (1/2″), thickness 4.76 mm — compatible with holders with a size 12 rhombic insert pocket.
- Tolerance class M provides repeatable edge positioning after indexing the insert in its pocket, without resetting the turning tool.
Applications and cutting data selection for the diamond-shaped insert
The CCMT 120404 insert (also written without spaces as ccmt120404) is suitable for turning shafts, bushings, and flanges made of structural steels, as well as stainless steel components, and its positive geometry also performs well in small-diameter boring bars. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft diameter of 40 mm at Vc = 180 m/min, the result is approximately 1432 rpm. For stainless steels, maintain a cutting speed of 70–100 m/min and a constant feed rate to limit work hardening of the layer being cut and remove heat from the small contact zone. Grade H6310 indexable inserts are supplied by the Korean brand Horn, and the PVD coating allows a single insert type to handle both ISO P and M groups. Reserve the 0.4 mm radius for finishing — for heavier passes and higher feed rates, choose the CCMT 120408 version with a nose radius rε of 0.8 mm. These two inserts differ only in nose radius; the remaining pocket dimensions are identical, so both fit the same holders.
▲
Application limitation
Grade H6310 is not intended for steels hardened above 45 HRC — for hard turning, choose an insert with a cubic boron nitride cutting edge (CBN). Reserve the small nose radius rε of 0.4 mm for finishing; use a larger radius for roughing and interrupted cutting.
Rhombic insert designation decoder according to ISO 1832
how to read the CCMT 120404 code — designation positions 1–7
Designation CCMT 120404 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 12 diamond-shaped pocket — external and internal turning
SCLCR/L 1616 H1216×16 × 100 mmR right-hand
←L left-hand
→
←L left-hand
→
SCLCR/L 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
SCLCR/L 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
SCMCN 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
SCMCN 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
SCACR/L 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
SCACR/L 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
S25S SCLCR/L-12Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
←L left-hand
→
S32T SCLCR/L-12Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
←L left-hand
→
S40U SCLCR/L-12Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
←L left-hand
→
S25S SCFCR/L-12Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
←L left-hand
→
S32T SCFCR/L-12Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
←L left-hand
→
S40U SCFCR/L-12Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
←L left-hand
→
Frequently asked questions about the CCMT 120404 insert
use, turning tool selection, and turning parameters
Two — the 80° diamond has 2 acute corners suitable for turning, and the positive geometry (7° clearance angle) makes the insert single-sided, with only the top surface used for cutting. Once one corner is worn, index the insert in its pocket to use the other.
Holders with a size 12 rhombic insert pocket (IC 12.7 mm): for external turning SCLCR/L (entering angle 95°), SCACR/L (90°) and SCMCN (50°) in cross sections from 16×16 to 25×25 mm; for internal turning, boring bars S25S–S40U with the suffix SCLCR/L or SCFCR/L. The full list is provided in the compatible turning tools section above.
Only in corner radius: 0.4 mm is used for finishing and semi-finishing at low feed rates, while 0.8 mm better withstands heavier passes and higher feed rates. The remaining dimensions (IC 12.7 mm, side length 12.9 mm, thickness 4.76 mm) are identical, so both inserts fit the same holders.
Yes — grade H6310 covers group ISO M20-M40. Maintain a cutting speed of 70–100 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 CCMT 120408 H6310 Horn
Reference: 0000004457 In stock > 10 items
€5.79
€7.12 brutto
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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