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Tungaloy RCMT0502MO-61 T9115 Round CVD Coated Turning Insert
$58.99 USD
Tungaloy RCMT0502MO-61 T9115 Insert Round Positive Turning | 61 Finishing Breaker | Premium T9115 CVD Grade What is the best round insert for high-speed steel turning? The Tungaloy RCMT0502MO-61 T9115...
Tungaloy RCMT0502MO-61 T9215 Round Carbide Turning Insert for Steel Machining
$41.78 USD
Tungaloy RCMT0502MO-61 T9215 Indexable Round Carbide Turning Insert Which carbide insert is best optimized for high-speed finish turning of steel profiles with excellent chip control? The Tungaloy RCMT0502MO-61 T9215 is...
Tungaloy RCMT0803MO-61 TH10 Round Carbide Insert for Aluminum & Copper
$55.54 USD
Tungaloy RCMT0803MO-61 TH10 Insert Non-Ferrous Precision | 61 Finishing Breaker | Sub-Micron TH10 Grade Which round insert provides a mirror finish on aluminum parts? The Tungaloy RCMT0803MO-61 TH10 is a...
Tungaloy RCMT0602MO-61 TH10 Round Carbide Insert for Non-Ferrous Metals
$53.24 USD
Tungaloy RCMT0602MO-61 TH10 Insert Non-Ferrous Specialist | 61 Finishing Breaker | Sub-Micron TH10 Grade What is the best round insert for aluminum and copper turning? The Tungaloy RCMT0602MO-61 TH10 is...
Tungaloy RCMT0803MO-61 T9125 Round Carbide Steel Turning Insert
$53.88 USD
Tungaloy RCMT0803MO-61 T9125 Insert Universal Steel Turning | 61 Finishing Breaker | Versatile T9125 CVD Grade How do I choose the best round insert for general steel machining? The Tungaloy...
Tungaloy RCMT0502MO-61 T9125 Round Carbide Steel Turning Insert
$58.99 USD
Tungaloy RCMT0502MO-61 T9125 Insert Stable Steel Turning | 61 Finishing Breaker | Versatile T9125 CVD Grade What is the best round insert for interrupted steel cuts? The Tungaloy RCMT0502MO-61 T9125...
Tungaloy RCMT0803MO-61 T9115 Round CVD Coated Steel Turning Insert
$77.38 USD
Tungaloy RCMT0803MO-61 T9115 Insert Professional Round Turning | 61 Finishing Breaker | Premium T9115 CVD Grade What is the most durable round insert for high-speed steel finishing? The Tungaloy RCMT0803MO-61...
Tungaloy RCMT0602MO-61 T9115 Round CVD Coated Steel Turning Insert
$61.29 USD
Tungaloy RCMT0602MO-61 T9115 Insert Round Positive Turning | 61 Finishing Breaker | Premium T9115 CVD Grade Which round insert is best for high-speed steel profiling? The Tungaloy RCMT0602MO-61 T9115 is...
Tungaloy RCMT0803MO-61 NS9530 Round Cermet Turning Insert
$48.64 USD
Tungaloy RCMT0803MO-61 NS9530 Insert Precision Round Turning | 61 Finishing Breaker | Premium NS9530 Cermet How do I achieve a mirror-like surface finish on steel shafts? The Tungaloy RCMT0803MO-61 NS9530...
Tungaloy RCMT0602MO-61 NS9530 Positive Round Cermet Turning Insert
$46.34 USD
Tungaloy RCMT0602MO-61 NS9530 Insert Precision Round Turning | 61 Finishing Breaker | Premium NS9530 Cermet How can I achieve a mirror-like finish on carbon steel parts? The Tungaloy RCMT0602MO-61 NS9530...
Tungaloy RCMT0502MO-61 NS9530 Positive Round Cermet Turning Insert
$46.34 USD
Tungaloy RCMT0502MO-61 NS9530 Insert High-Precision Round Turning | 61 Finishing Breaker | Premium NS9530 Cermet What is the best cermet insert for high-speed finishing? The Tungaloy RCMT0502MO-61 NS9530 is a...
Tungaloy RPMT/W AH120 Round Milling Inserts | RPMT08T2 RPMT10T3 RPMT1204
$40.60 USD – $53.05 USD
Tungaloy RPMT & RPMW AH120 Series High-Stability Round Milling | PVD Coated AH120 | Universal Steel Grade What are the best round milling inserts for general steel and stainless? The...
Tungaloy RCMM1003MO-61 NS9530 Round Cermet Turning Insert
$46.34 USD
Tungaloy RCMM1003MO-61 NS9530 Insert Round Positive Turning | 61 Finishing Chipbreaker | Premium NS9530 Cermet What is the best cermet insert for achieving a mirror finish on steel? The Tungaloy...
Tungaloy RC / RP / RD Round Turning Inserts — RCMT, RCMM Profiling, Copy Turning & Form Tools
13 in-stock round Tungaloy indexable carbide turning inserts covering 2 geometry families (RCMT / RCMM) and 5 grade families (T9215 / T9115 / T9125 / TH10 / NS9530 / AH120). IC sizes 5.0-10.0 mm. The full-radius geometry for copy turning, profiling, and form tools. 2-3 day dispatch from Zhejiang warehouse, DHL/UPS worldwide 3-7 days, all ISO 1832 compliant.
13SKUs in Stock
RoundFull-Radius Geometry
6Carbide Grades
5-10mmIC Size Range
About RC / RP / RD Round Inserts (R-Style)
The ISO 1832 R-shape family delivers a round (circular) cutting edge — the most versatile geometry for profiling, copy turning, and form tools. Tungaloy's R-family includes three main clearance variants:
- RC (7° positive clearance) — 12 SKUs. The dominant 7° positive round insert with chip-breaker. Used for profiling and copy turning with low cutting force.
- RP (11° positive clearance) — Currently not stocked (sourced on-demand). Sharper 11° rake for ultra-precision profiling.
- RD (15° positive clearance) — Currently not stocked (sourced on-demand). Sharpest 15° rake, but rarely used in modern CNC turning.
Round inserts are the go-to geometry for copy turning, profiling, and form tools — the full-radius cutting edge creates smooth convex surfaces without the corner-tracking issues of polygon inserts. Common applications include ball-end milling on turning centers, tire mold profiling, hydraulic manifold porting, and complex 3D surface machining. The round geometry also has the strongest edge in the standard ISO lineup (no corners to chip).
Tungaloy's RCMT catalog in this collection focuses on the MO-61 chip-breaker (Tungaloy's medium all-round designation) across 4 IC sizes (5.0 / 6.0 / 8.0 / 10.0 mm) and 5 grade families: T9215 / T9115 (CVD steel), T9125 (CVD stainless), TH10 (uncoated aluminum), NS9530 (cermet finishing), and AH120 (milling-grade for face milling).
2 Geometry Families — Featured In-Stock SKUs
Below are 10 representative SKUs from our 13-piece RCMT round insert inventory. Click through to verify grade specs, IC size, and full dimensional drawings.
RCMT — Positive 7° (M chip-breaker, M tolerance)
12 SKUs. The dominant round positive insert with chip-breaker on both faces. IC sizes 5.0 / 6.0 / 8.0 / 10.0 mm, all with MO-61 chip-breaker (Tungaloy medium all-round). Used for profiling, copy turning, and form tools on CNC lathes.
T9215T9115T9125TH10NS9530
RCMM — Positive 7° (M chip-breaker, M tolerance, no hole)
1 SKU. Solid round insert with no mounting hole. Used for specialized form tools and copy turning where the hole is not required. RCMM1003MO-61 NS9530 cermet for mirror surface finishing.
NS9530Cermet
RPMT — Round Milling Insert (Bonus, AH120 grade)
1 SKU. Tungaloy RPMT/W AH120 round milling insert, sizes RPMT08T2 / RPMT10T3 / RPMT1204. With M01 chipbreaker for steel face milling. Bonus product — same round geometry but in milling application.
AH120Milling
Browse by Application & Grade
All 13 RCMT round SKUs are grouped below by application and grade. Click any category to filter the full catalog.
By Workpiece Material
- Carbon Steel / Alloy Steel — RCMT-MO-61 T9215 / T9115 (5+ SKUs)
- Stainless Steel (Interrupted) — RCMT-MO-61 T9125 (2 SKUs)
- Aluminum & Non-Ferrous — RCMT-MO-61 TH10 (uncoated, 2 SKUs)
- Mirror Finish on Steel — RCMT-MO-61 NS9530 cermet (3+ SKUs)
- Steel Face Milling — RPMT-M01 AH120 (milling insert, 1 SKU)
By IC Size
- 5.0 mm (RCMT 0502): Small diameter, finishing. 3 SKUs across grades (T9115/T9125/T9215/NS9530).
- 6.0 mm (RCMT 0602): Medium diameter, general use. 3 SKUs across grades.
- 8.0 mm (RCMT 0803): Larger diameter, copy turning. 4 SKUs across grades.
- 10.0 mm (RCMT/RCMM 1003): Largest, heavy profiling. 2 SKUs (NS9530 cermet).
By Carbide Grade
- T9215 (CVD Steel P-grade) — Tungaloy's premium CVD grade for general steel turning (P15-P30).
- T9115 (CVD Steel P-grade) — Tungaloy's CVD grade for steel finishing (P10-P20).
- T9125 (CVD Stainless M-grade) — Tungaloy's CVD grade for stainless steel with interrupted cuts (M15-M30).
- TH10 (Uncoated Carbide) — Tungaloy's uncoated grade for aluminum and non-ferrous metals (N10-N25).
- NS9530 (Cermet) — Tungaloy's premium cermet grade for mirror surface finishing (P05-P15).
- AH120 (PVD Milling) — Tungaloy's PVD grade for steel face milling (P15-P35).
RC vs SN vs TN vs CN — Round vs Polygon Geometry Comparison
Where does the round RC insert fit among Mitsubishi's polygon turning lineup? This table compares RC against SN (90° square), TN (60° triangle), and CN (80° diamond).
| Attribute | RC (round) | SN (90° square) | TN (60° triangle) | CN (80° diamond) |
|---|---|---|---|---|
| Shape | Circular (full radius) | 90° square | 60° triangle | 80° rhombic |
| Cutting edge | 360° continuous | 4 edges (4 corners) | 3 edges (3 corners) | 4 edges (2 corners) |
| Edge strength | ★★★★★ (strongest, no corners) | ★★★★★ | ★★★★★ | ★★★★ |
| Edge sharpness | ★★ (dullest, no corner) | ★★ | ★★★ | ★★★ |
| Best for | Profiling, copy turning, form tools | Heavy roughing | General turning | General cast iron, steel |
| Surface finish | Best (no tracking marks) | Good (4 corner marks) | Good (3 corner marks) | Good (2 corner marks) |
| Max depth of cut | ~ IC / 2 (profiling depth) | ~ 10 mm | ~ 8 mm | ~ 6 mm |
| Typical IC range | 5-25 mm | 12-25 mm | 11-22 mm | 12-19 mm |
| Common holders | SRDC / PRDC / MRDC | DSBNR/L, PSBNR/L | MTJNR/L, PTFNR/L | DCLNR/L, PCLNR/L |
| Common workpiece | 3D surfaces, molds, manifolds | Forged steel, cast iron | Steel, stainless, cast iron | Cast iron, steel, stainless |
| Catalog count (Tungaloy) | 13 (this collection) | — | — | — |
| Best grade pairing | T9215, T9115, T9125, NS9530 | UE6020, UC5115 | UE6020, US735 | UC5115, US735 |
Bottom line: Pick RCMT for profiling, copy turning, and form tools where the round geometry creates smooth surfaces without corner-tracking. Pick SN / TN / CN for general turning where corner edges matter more than full-radius profiling. The round insert's main advantage is its 360° continuous edge — no corners to chip on interrupted cuts, and the strongest edge in the standard ISO lineup.
How to Choose the Right RC Round Insert — 3-Step
Step 1 — Identify the Operation
- Profiling / copy turning: RCMT with T9215 / T9115 (CVD steel) for general; NS9530 cermet for mirror finish.
- 3D surface machining (mold, die): RCMT with NS9530 cermet (best surface finish).
- Aluminum / non-ferrous profiling: RCMT with TH10 (uncoated, sharp edge).
- Stainless steel profiling with interruptions: RCMT with T9125 (CVD stainless M-grade).
- Form tool (custom profile): RCMT with appropriate grade for material.
Step 2 — Pick the IC Size
- 5.0 mm (RCMT 0502): Small profiling depth, finishing.
- 6.0 mm (RCMT 0602): General profiling, balanced.
- 8.0 mm (RCMT 0803): Larger profiling depth, copy turning.
- 10.0 mm (RCMT/RCMM 1003): Largest in catalog, heavy profiling.
Step 3 — Verify Holder Compatibility
- RC (round, 7° positive): Use Tungaloy SRDC-type boring bar or PRDC positive turning holder with round pocket.
- Verify lead angle: Round inserts have a 0° lead angle, so any holder with a round pocket works (SRDC, PRDC, MRDC).
- Match IC to holder pocket: RCMT 05 needs 5 mm pocket; RCMT 06 needs 6 mm; etc.
Frequently Asked Questions
What is the difference between RCMT, RPMT, and RDMT?
RCMT has 7° positive clearance (most common round positive). RPMT has 11° positive clearance (sharper, ultra-precision). RDMT has 15° positive clearance (sharpest, rare). Our catalog currently has only RCMT (12 SKUs) + RCMM (1 SKU) — RPMT and RDMT are not stocked but can be sourced on-demand within 5-7 days. Note: there's also a Tungaloy RPMT-M01 AH120 round milling insert included as a bonus product — this is for steel face milling, not turning.
What is the MO-61 chip-breaker on Tungaloy RCMT inserts?
MO-61 is Tungaloy's designation for the medium all-round chip-breaker on round positive inserts. The "MO" prefix indicates "medium" chip-breaker geometry; "61" is Tungaloy's internal code for this specific chip-breaker shape. MO-61 provides good chip control at moderate feed rates, suitable for most profiling and copy turning operations.
Why is the round geometry better for profiling than polygon inserts?
The round geometry has a 360° continuous cutting edge without corners. When profiling along a 3D surface, polygon inserts (SN/TN/CN) leave corner-tracking marks on the workpiece because the corners periodically engage the surface. The round insert's continuous edge creates smooth, uniform surfaces without tracking marks — making it ideal for mold, die, and manifold applications.
Which grade is best for stainless steel profiling with RCMT inserts?
For 304/316 stainless profiling, we recommend T9125 (CVD M-grade) as the primary choice — its coating handles austenitic stainless with interrupted cuts. For mirror surface finishing on stainless, use NS9530 cermet. For general steel profiling, use T9215 or T9115 (CVD P-grade).
Can I use round inserts on a standard CNC lathe, or only on special machines?
Round inserts can be used on any CNC lathe that has a round-pocket holder. The most common setup is an SRDC-style boring bar (for internal profiling) or a special tool block with a round pocket. Some standard turning holders (e.g., DCLN) can also accept round inserts in some configurations, but the standard recommendation is a dedicated round-pocket holder for best performance.
What is the smallest and largest RC insert you stock?
Smallest: RCMT0502MO-61 (5.0 mm IC, Tungaloy designation for small profiling). Largest: RCMT0803MO-61 and RCMM1003MO-61 (8.0-10.0 mm IC, for larger profiling depth). The 5.0-10.0 mm range covers most small-to-medium profiling applications; larger IC (12+ mm) for heavy profiling can be sourced on-demand.
Related Tungaloy & Other Brand Inserts
Need a Specific Tungaloy Round Insert Not in Stock?
13 in-stock RCMT / RCMM round SKUs. For specialty RPMT (11° positive), RDMT (15° positive), 12+ mm IC heavy profiling, or specific Tungaloy equivalent cross-references (Sandvik / Mitsubishi / Kennametal / Iscar / Walter), request a quote — 24-hour response, 2-3 day dispatch from Zhejiang, DHL/UPS worldwide 3-7 days.
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