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Description
CCMT 120408 turning insert – single-sided positive 80° rhombus
| Technical data | |
|---|---|
| Side length l | 12.9 mm |
| Insert thickness s | 4.76 mm |
| Hole diameter d1 | 5.5 mm |
| Corner radius rε | 0.8 mm |
| ANSI code | CCMT 432 |
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 |
Grade H6310 cemented carbide indexable insert – applications and construction
single-sided, positive 80° rhombus with a hole and chip breaker
The CCMT 120408 turning insert is a single-sided, positive 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 corner strength with good access to the workpiece contour. Positive geometry with a 7° clearance angle reduces cutting forces, making the insert suitable for slender shafts and internal turning. The nose radius rε of 0.8 mm provides a good surface finish at feed rates of 0.12–0.21 mm/rev.
Key advantages of the H6310 cemented carbide insert
- Positive, single-sided geometry — the 7° clearance angle reduces cutting forces and power consumption, benefiting slender shafts and boring operations.
- 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 0.8 mm — a versatile version combining surface finish with corner strength at feed rates of 0.12–0.21 mm/rev.
- The 80° corner angle provides a strong, rigid corner for longitudinal turning and facing with one tool.
- Tolerance class M ensures repeatable edge positioning after indexing the insert in the holder pocket.
- Dimensions according to ISO 1832: IC 12.7 mm (1/2″), thickness 4.76 mm, ANSI code CCMT 432 — compatible with holders with a size 12 C-shaped rhombic insert pocket.
Applications and cutting data selection for the diamond-shaped insert
The CCMT 120408 insert (also written without spaces as ccmt120408) performs well in external and internal turning of shafts, bushings, and flanges made of structural steels and stainless steel. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft diameter of 40 mm at Vc = 150 m/min, the result is approximately 1193 rpm. For stainless steel, maintain a cutting speed of 70–100 m/min and a constant feed rate to limit work hardening of the layer being cut. Grade H6310 indexable inserts are supplied by the Korean brand Horn.
Positive geometry with a relief-ground flank reduces friction and power consumption, so CCMT performs well on less rigid machines and when boring smaller holes. The single-sided chip breaker forms and breaks chips even at shallow depths of cut, improving chip evacuation in the machining zone and benefiting turning inserts in series production. The PVD coating increases the edge's resistance to abrasion and oxidation, keeping it sharp longer and maintaining stable workpiece tolerances between insert indexing operations. In the CCMT 1204 family, the nose radius determines the application: 0.4 mm for finishing, 0.8 mm as a general-purpose version, and a larger radius for heavier passes. Use emulsion coolant for alloy steels; for stainless steel, a continuous supply of pressurized coolant reduces built-up edge.
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Application limitation
Grade H6310 is not intended for steels hardened above 45 HRC — for turning inserts for hardened steel, choose version CCMT 120408 CBN with a cubic boron nitride cutting edge.
Rhombic insert designation decoder according to ISO 1832
how to read the CCMT 120408 code — designation positions 1–7
Designation CCMT 120408 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 size 12 C-shaped rhombic insert 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 120408 insert
use, turning tool selection, and turning parameters
Two — the rhombus has two corners 80° suitable for turning, and the positive, single-sided design uses one side of the insert. Once both corners are worn, replace the insert with a new one, as the other side has no clearance face.
Holders with a C-shaped rhombic insert pocket, IC 12.7 mm: for external turning SCLCR/L (95°), SCACR/L (90°) and SCMCN with cross sections of 16×16–25×25 mm; for internal turning, boring bars S25S–S40U with the suffix SCLCR/L or SCFCR/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 heavier passes. The remaining dimensions (IC 12.7 mm, thickness 4.76 mm) are identical.
Yes — grade H6310 covers group ISO M20-M40. Maintain a cutting speed of 70–100 m/min, a constant feed, and continuous cooling: austenitic steel dissipates heat poorly and work-hardens when cutting is too slow.
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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