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Description
RCMT 0803 turning insert – round indexable insert
| Technical data | |
|---|---|
| Insert diameter d | 8 mm |
| Insert thickness s | 3.18 mm |
| Hole diameter d1 | 3.4 mm |
Cutting data for the RCMT 0803 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 | 0.05 | 0.8 | 170-240 | 0.2 | 2 | 150-215 | 0.25 | 3.2 |
| MStainless steel | 110-230 | 0.05 | 0.8 | 70-175 | 0.2 | 2 | 50-135 | 0.25 | 3.2 |
H6310 cemented carbide round insert – applications and design
single-sided, positive 7° geometry with a mounting hole
The RCMT 0803 turning insert is a round, single-sided indexable insert made of grade H6310 cemented carbide, designed for turning steel and stainless steel. Shape R, a full circle, has no discrete corners — it cuts with a continuous peripheral edge that is indexed by rotating the insert in its pocket. Positive geometry with a 7° clearance angle reduces cutting forces and power consumption, making it suitable for machining thin-walled and flexible workpieces. The insert, with a diameter of 8 mm and thickness of 3.18 mm, is secured with a screw through the central countersunk hole. The PVD coating of grade H6310 increases edge resistance to abrasion and high temperatures, allowing the insert to retain its sharpness during continuous turning of structural steels.
Key benefits of the H6310 round insert
- Peripheral edge without corners — long, gradual contact with the material distributes the load, improves surface finish, and strengthens the cutting edge during profile turning.
- Grade H6310 for ISO groups P and M — general-purpose PVD-coated carbide: steel (P20-P40) and stainless steel (M20-M40), and occasionally cast iron.
- Positive 7° geometry — lower cutting forces and reduced power consumption, beneficial for thin-walled workpieces and those with low rigidity.
- Repeated indexing by rotating the insert in its pocket extends the service life of a single edge.
- Dimensions comply with ISO 1832: diameter 8 mm, thickness 3.18 mm, hole 3.4 mm — compatible with tool holders with a 08 round pocket.
- Smooth variation of the depth of cut along the radius — suitable for copy turning and radius transitions.
Round insert applications and cutting data selection
The RCMT 0803 insert (also written without a space as rcmt0803) is suitable for profile turning, copy turning, and turning radii, where the long peripheral edge distributes the load and leaves a smooth surface. The round shape allows the depth of cut to vary smoothly along the radius, making it well suited to convex and concave profiles and radius transitions. Typical workpieces include shafts, bushings, and flanges with rounded contours, machined from structural and stainless steels. For stainless steel, maintain a constant feed and continuous emulsion cooling to limit work hardening of the layer being cut. The long contact between the insert and the material increases radial forces, so reduce the depth of cut on slender shafts and ensure rigid workholding.
Calculate spindle speed using n = 1000·Vc/(π·D): for a workpiece diameter of 40 mm at Vc = 200 m/min, the result is approximately 1592 rpm. When roughing steel, grade H6310 operates at 150–215 m/min, and for stainless steel at 50–135 m/min, always with an appropriately selected feed and depth of cut. Indexable inserts in grade H6310 are supplied by the Korean brand Horn, known for general-purpose PVD-coated carbides for steel and stainless steel.
▲
Application limitation
Grade H6310 is not intended for steels hardened above 45 HRC — for hard turning, choose a round insert made of cubic boron nitride (CBN) or ceramic. The long contact edge also requires rigid workholding.
Round insert designation decoder according to ISO 1832
how to read the RCMT 0803 code — positions 1–6 of the designation
Designation RCMT 0803 according to the standard ISO 1832: 4 letters describe geometry and construction, 2 numeric codes describe dimensions. Each field has a number, an icon, and a brief description.
Compatible turning tools
tool holders with a 08 round pocket — external turning of steel and stainless steel
SRDCN 1616 H0816×16 × 100 mmNeutral
↔
↔
SRDCN 2020 K0820×20 × 125 mmNeutral
↔
↔
SRDCN 2525 M0825×25 × 150 mmNeutral
↔
↔
SRDCN 3232 P0832×32 × 170 mmNeutral
↔
↔
SRGCR/L 1616 H0816×16 × 100 mmR right-hand
←L left-hand
→
←L left-hand
→
SRGCR/L 2020 K0820×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
SRGCR/L 2525 M0825×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
SRGCR/L 3232 P0832×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
Frequently asked questions about the RCMT 0803 insert
use, turning tool selection, and turning parameters
A round insert has no discrete corners — it cuts with a continuous peripheral edge. Once one section is worn, simply loosen the screw and rotate the insert in its pocket to position a fresh section of the edge in the cutting zone. This provides several working positions from a single-sided insert.
Tool holders with a 08 round pocket for external turning: neutral SRDCN and right-hand and left-hand SRGCR/L with shank cross sections from 16×16 to 32×32 mm. The insert is secured with a screw through the central hole, so select a tool holder to match pocket size 08 and the required entering angle.
For profile turning and copy turning, radius transitions, and convex and concave profiles. The round shape allows the depth of cut to vary smoothly along the radius, while the long contact edge improves surface finish. Reduce the depth of cut on slender workpieces because insert contact increases radial forces.
Yes — grade H6310 covers group ISO M20-M40. Maintain a cutting speed of 50–230 m/min depending on the operation, a constant feed, and continuous emulsion 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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