Sort by:
Mitsubishi CNMG120408-MA UE6110 High-Speed Steel Turning Insert (10pcs)
$73.79 USD
CNMG120408-MA UE6110 High-Velocity Steel Master | UE6110 CVD Grade | MA General Purpose Geometry Optimized for High-Production Steel Turning UE6110 Grade (The High-Speed Specialist): The UE6110 is a premium CVD-coated...
Mitsubishi CNMG120408-MA UE6020 Carbide Turning Insert for Steel (10pcs)
$73.06 USD
CNMG120408-MA UE6020 Universal Steel Specialist | UE6020 CVD Grade | MA General Purpose Geometry The Professional Choice for Steel Turning UE6020 Grade (Advanced CVD Coating): The UE6020 is Mitsubishi’s flagship...
Mitsubishi CNMG120408-MA UC5115 Cast Iron Turning Insert (10pcs)
$73.06 USD
CNMG120408-MA UC5115 The Cast Iron Specialist | UC5115 CVD Hardness | Abrasive Resistance Geometry Engineered for Abrasive Environments UC5115 Grade (Ultra-Hard CVD Coating): The UC5115 is Mitsubishi's flagship grade for...
Mitsubishi CNMG120408-MA MC6025 Carbide Turning Insert for Steel (10pcs)
$75.61 USD
CNMG120408-MA MC6025 The Universal Steel Master | Nano-Texture CVD Grade | MA Multi-Purpose Geometry The New Standard in Steel Machining MC6025 Grade (Nano-Texture CVD Technology): The MC6025 is Mitsubishi's next-generation...
Mitsubishi CNMG120408-MA MC6015 High-Speed Steel Turning Insert (10pcs)
$74.88 USD
CNMG120408-MA MC6015 High-Velocity Steel Specialist | Nano-Texture CVD Grade | MA Chipbreaker Next-Gen Productivity: The MC6015 Edge MC6015 Grade (Nano-Texture Technology): The MC6015 is Mitsubishi's most advanced CVD grade for...
Mitsubishi CNMG120408-GM MC7025 Stainless Steel Turning Insert (10pcs)
$70.50 USD
CNMG120408-GM MC7025 Stainless Steel Workhorse | MC7025 Heat Resistance | GM Balanced Geometry Optimized for Tough & Sticky Materials MC7025 Grade (CVD Stainless Specialist): The MC7025 is Mitsubishi's premier CVD-coated...
Mitsubishi CNMG120408-GK MC5015 Cast Iron Turning Insert (10pcs)
$73.06 USD
CNMG120408-GK MC5015 Cast Iron Powerhouse | MC5015 Wear Resistance | GK Stable Geometry Optimized for Heavy-Duty Cast Iron Turning MC5015 Grade (Nano-Layer CVD): The MC5015 is Mitsubishi's premium solution for...
Mitsubishi CNMG120408-GK MC5005 High-Speed Cast Iron Insert (10pcs)
$73.06 USD
CNMG120408-GK MC5005 High-Velocity Specialist | MC5005 Ultra-Hard CVD | GK Robust Stability Engineered for Maximum Throughput in Cast Iron MC5005 Grade (The Wear Resistance King): The MC5005 is Mitsubishi's flagship...
Mitsubishi CNMG120408-GH UE6020 Heavy Roughing Insert (10pcs)
$74.88 USD
CNMG120408-GH UE6020 Heavy Roughing Titan | UE6020 Impact Toughness | GH Reinforced Geometry The Powerhouse for Heavy Steel Removal UE6020 Grade (The Fracture Resister): The UE6020 is a specialized CVD-coated...
Mitsubishi CNMG120408 UC5115 CVD Carbide Turning Insert for Cast Iron (10pcs)
$62.98 USD
Mitsubishi CNMG120408 (CNMG432) UC5115 Cast Iron Turning Carbide Inserts (10 Pcs/Box) Heavy-Duty 80° Diamond Turning Inserts | ISO CNMG120408 / ANSI CNMG432 | Dedicated UC5115 CVD Grade for Gray &...
Mitsubishi CNMG120408 UC5105 High-Speed Cast Iron Turning Insert (10pcs)
$81.46 USD
CNMG120408 UC5105 High-Speed Performance | UC5105 CVD Grade | Gray Iron Specialist Engineered for Maximum Surface Speed UC5105 Grade (CVD Coating): UC5105 is the premier grade for High-Speed Turning of...
Mitsubishi CNMG120408 NX2525 Cermet Turning Insert for Steel (10pcs)
$73.79 USD
CNMG120408 NX2525 High-Speed Finishing Specialist | NX2525 Cermet Grade | Surface Ra Perfection The Cermet Advantage: Grade NX2525 NX2525 Cermet Grade: Mitsubishi’s NX2525 is a Titanium Carbonitride (TiCN) based cermet....
Mitsubishi CNMG120404-SH NX2525 Cermet Finishing Insert (10pcs)
$76.34 USD
CNMG120404-SH NX2525 High-Gloss Finishing | NX2525 Cermet Technology | SH Stability Geometry Precision Engineering for Superior Aesthetics NX2525 Grade (Ultra-Micro Cermet): NX2525 is an uncoated TiCN-based cermet grade. It provides...
Mitsubishi CNMM190624-HX UE6020 Heavy Duty Roughing Insert (10pcs)
$211.20 USD
CNMM190624-HX UE6020 Extreme Metal Removal | UE6020 Toughness | HX Heavy-Duty Geometry Built for the Largest Steel Machining Tasks UE6020 Grade (The Steel Shield): The UE6020 is a specialized CVD-coated...
Mitsubishi CNMG120412 UC5115 CVD Carbide Insert for Heavy Cast Iron Roughing
$73.06 USD
CNMG120412 UC5115 Roughing Powerhouse | UC5115 CVD Grade | 1.2mm Heavy-Duty Radius Engineered for Maximum MRR UC5115 Grade (CVD Coating): The UC5115 is a high-performance CVD-coated grade optimized for K-Class...
Mitsubishi CNMG190616-MA US735 Heavy-Duty Stainless Steel Insert (10pcs)
$178.48 USD
CNMG190616-MA US735 The Roughing Goliath | US735 PVD Toughness | 1.6mm Reinforced Radius Engineered for High-Volume Metal Removal US735 Grade (Maximum Impact Strength): The US735 is Mitsubishi’s specialized PVD grade...
Mitsubishi CNMG190612-MA US735 Heavy Duty Stainless Steel Insert (10pcs)
$168.08 USD
CNMG190612-MA US735 Heavy Roughing Titan | US735 PVD Grade | MA Medium-Heavy Geometry Built for Extreme Scale & Heavy Roughing US735 Grade (The Impact Specialist): When machining large stainless steel...
Mitsubishi CNMG120408-MJ VP10RT Stainless & Alloy Turning Insert (10pcs)
$75.61 USD
CNMG120408-MJ VP10RT Stainless Specialist | VP10RT Miracle PVD | MJ Medium-Roughing Edge Superior Performance in Heat-Resistant Materials VP10RT Grade (The Miracle PVD): The VP10RT grade features Mitsubishi’s proprietary "Miracle" PVD...
Mitsubishi CN 80° Diamond Negative Inserts — CNMG, CNMA, CNMM Heavy-Duty Cast Iron & Steel Turning
66 in-stock 80° negative diamond Mitsubishi indexable carbide turning inserts covering 3 geometry families (CNMG / CNMA / CNMM) and 6 grade families (UC5115 / UC5105 / MC5015 / US735 / VP15TF / UE6020 / AP25N). Optimized for cast iron roughing, stainless profiling, steel turning, and heavy-duty interrupted cuts. IC sizes 12-19 mm. 2-3 day dispatch from Zhejiang warehouse, DHL/UPS worldwide 3-7 days, all ISO 1832 compliant.
66SKUs in Stock
3Geometry Families
7Carbide Grades
80° neg.CN Geometry
About CN 80° Negative Diamond Inserts (CN-Style)
The ISO 1832 CN-shape family delivers an 80° negative-rake rhombic cutting edge — the workhorse geometry for medium-to-heavy turning on cast iron and steel. Mitsubishi's CN lineup includes three main geometry variants:
- CNMG (M chip-breaker, M tolerance) — 58 SKUs. The everyday 80° negative with chip-breaker on both faces. Double-edged economy for general roughing and finishing.
- CNMA (no chip-breaker, A tolerance) — 5 SKUs. Flat-top negative insert with hole only. Used for heavy roughing of cast iron where chip-breaking is not needed, and as a brazed tool blank.
- CNMM (M chip-breaker, M tolerance) — 1 SKU. Heavy-duty negative with stronger edge for interrupted cuts on steel.
CN inserts are the go-to negative turning geometry for cast iron (engine blocks, brake discs, pump housings) and steel (shafts, flanges, gears) where strong edge and good chip control are both required. The 80° included angle provides the best balance between cutting edge strength and chip flow. Compared to 55° DN or 90° SN negative inserts, CNMG sits in the middle — strong enough for roughing, sharp enough for finishing.
3 Geometry Families — Featured In-Stock SKUs
Below are 10 representative SKUs from our 66-piece CN 80° negative inventory, covering all 3 geometry families and the most popular grade pairings. Click through to verify grade specs, IC size, nose radius, and full dimensional drawings.
CNMG — Negative 7° (M chip-breaker, M tolerance)
58 SKUs. The dominant 80° negative turning insert. Chip-breaker on both top and bottom faces for double-edged economy. Available in IC 12 mm, nose radius 0.4 / 0.8 / 1.2 / 1.6 mm, with chip-breaker variants MS (medium semi-finishing), FH (finishing), and others.
US735VP15TFUE6020UC5115AP25N
CNMA — Negative 7° (no chip-breaker, A tolerance)
5 SKUs. Flat-top negative insert with no chip-breaker on the top face. Used for heavy roughing of cast iron where chip-breaking is handled by the cutting geometry. A-tolerance = standard precision, suitable for most heavy turning applications.
UC5115MC5015UC5105
CNMM — Negative 7° (M chip-breaker, M tolerance, heavy)
1 SKU. The heavy-duty CN variant. CNMM190624-HX UE6020 is specifically designed for interrupted cuts on steel — the 19.0 mm IC and 2.4 mm nose radius can handle depths of cut up to 6 mm. Used for roughing of forged steel, gear blanks, and flanges.
UE6020
Browse by Application & Grade
All 66 CN 80° negative SKUs are grouped below by application and grade. Click any category to filter the full catalog.
By Workpiece Material
- Cast Iron (K-grade) — CNMA-UC5115, CNMA-MC5015, CNMA-UC5105 (10 SKUs)
- Stainless Steel (M-grade) — CNMG-MS US735 (10+ SKUs)
- Carbon Steel / Alloy Steel (P-grade) — CNMG-MS UE6020, CNMG-MS VP15TF (15+ SKUs)
- Mirror Finishing / Precision — CNMG-FH AP25N (cermet)
- Heavy-Duty Steel Roughing — CNMM-HX UE6020 (interrupted cuts)
By Operation
- Cast Iron Heavy Roughing — CNMA-UC5115 / MC5015 (no chip-breaker, free cutting)
- Steel / Stainless Profiling — CNMG-MS US735 / VP15TF
- Mirror Finishing — CNMG-FH AP25N (cermet)
- Interrupted Cut Steel — CNMM-HX UE6020 (heavy)
- General Negative Turning — CNMG series (workhorse)
By Carbide Grade
- CVD Cast Iron (K-grade) — UC5115 (K05-K20), MC5015 (K05-K15 high-speed), UC5105 (K05-K10)
- CVD Stainless Steel (M-grade) — US735 (M10-M25)
- PVD Universal (Miracle Coat) — VP15TF (P10-P25, M10-M25, S10-S20)
- CVD Steel (P-grade) — UE6020 (P20-P30)
- Cermet (Finishing) — AP25N (P05-P15, mirror surface)
CN vs SN vs DN — 3-Way Negative Geometry Comparison
Where does the CN 80° diamond fit among Mitsubishi's negative turning lineup? This table compares CN against SN (90° square) and DN (55° diamond) for cast iron and steel turning.
| Attribute | CN (80° neg.) | SN (90° neg.) | DN (55° neg.) |
|---|---|---|---|
| Shape | 80° rhombic | 90° square | 55° rhombic |
| Included angle | 80° | 90° | 55° |
| Clearance | 0° (negative) | 0° (negative) | 0° (negative) |
| Edge strength | ★★★★ | ★★★★★ (strongest) | ★★★ |
| Edge sharpness | ★★★ | ★★ (dullest) | ★★★★ |
| Best for | General cast iron, steel | Heavy roughing, interrupted | Profiling, copy turning |
| Max depth of cut | ~ 6 mm (CNMM) | ~ 10 mm (heavy) | ~ 4 mm |
| Typical IC range | 12-19 mm | 12-25 mm | 11-15 mm |
| Common holders | DCLNR/L, PCLNR/L | DSBNR/L, PSBNR/L | DDJNR/L, PDJNR/L |
| Common workpiece | Cast iron, steel, stainless | Steel, forged parts | Shaft, slender parts |
| Catalog count (Mitsubishi) | 66 (this collection) | 15+ (SNMG) | 15+ (DNMG) |
| Best grade pairing | UC5115, US735, UE6020 | UE6020, UC5115 | VP15TF, US735 |
Bottom line: Pick CNMG for the broadest range of cast iron and steel turning — it's the workhorse negative geometry with the deepest catalog. Pick SNMG for the heaviest roughing where edge strength matters more than sharpness. Pick DNMG for profiling where the sharper 55° angle gives better surface finish.
How to Choose the Right CN 80° Negative Insert — 3-Step
Step 1 — Identify the Workpiece
- Cast iron (gray, ductile, CGI): CNMA flat-top with UC5115 / MC5015 / UC5105 grade. No chip-breaker is fine for free-cutting cast iron.
- Stainless steel 304/316: CNMG-MS with US735 grade (M-grade CVD coated for stainless).
- Carbon steel / alloy steel: CNMG-MS with UE6020 (P-grade CVD) or VP15TF (PVD universal).
- Mirror finishing on steel: CNMG-FH with AP25N cermet.
- Heavy interrupted cuts on steel: CNMM-HX with UE6020.
Step 2 — Pick the Chip-Breaker
- MS (medium semi-finishing): Light to medium chip-breaker for general profiling and finishing. Most common.
- FH (finishing): Very light chip-breaker for mirror surface and low feed finishing.
- No chip-breaker (CNMA): Flat top, used for cast iron and heavy roughing where chip flow is not constrained.
- HX (heavy): Strong chip-breaker for interrupted cuts and heavy depths.
Step 3 — Verify Holder Compatibility
- CN (80° negative): Use DCLN-type holders (double clamp, 80° lead angle) or PCLN (pin lock). Most common negative turning holders.
- Verify lead angle: 80° matches CNMG perfectly. Some holders (e.g., DCLN 2525-M12) accept 12 mm IC; larger (e.g., DCLN 3232-P19) accept 19 mm IC.
- Match IC to holder pocket: CNMG 12 needs 12 mm pocket; CNMM 19 needs 19 mm pocket.
Frequently Asked Questions
What is the difference between CNMG, CNMA, and CNMM?
CNMG has M-tolerance with M chip-breaker (both faces) — the workhorse 80° negative for general turning. CNMA has A-tolerance with no chip-breaker (flat top) — used for cast iron heavy roughing. CNMM has M-tolerance with M chip-breaker but heavy-duty construction — used for interrupted cuts and roughing of forged steel. Mitsubishi's catalog has 58 CNMG + 5 CNMA + 1 CNMM in this collection.
Why does the collection have 66 products but only 3 geometry families?
The CNMG family alone has 58 SKUs because of the variety of chip-breaker geometries (MS / FH / other), nose radius options (0.4 / 0.8 / 1.2 / 1.6 mm), and grade pairings (UC5115 / US735 / VP15TF / UE6020 / AP25N). Each combination is a distinct SKU. This is normal for production turning — the right chip-breaker and nose radius depends on depth of cut, feed rate, and workpiece material.
Which grade is best for cast iron roughing with CN inserts?
For cast iron (gray / ductile / CGI) roughing, we recommend UC5115 as the primary choice — its CVD TiC/TiCN/Al₂O₃ coating handles the abrasive nature of cast iron. For high-speed finishing of cast iron, MC5015 (CVD coated, K05-K15) is sharper and more wear-resistant. For light cuts on cast iron, UC5105 (CVD K05-K10) gives the cleanest edge.
What is the difference between CN and CC 80° inserts?
CN is 80° negative (0° clearance, hole with chip-breaker); CC is 80° positive (7° clearance, hole with chip-breaker). The negative CN is stronger for heavy roughing and interrupted cuts, while the positive CC is sharper for profiling and finishing. They are interchangeable on the same lead angle holder (DCLN-style), but the choice depends on whether you need edge strength (CN) or sharpness (CC).
Can I use CNMG inserts for stainless steel profiling?
Yes — CNMG-MS with US735 (M-grade CVD stainless) is a popular choice for stainless profiling, especially when profiling meets light interruptions. The negative rake provides the edge strength needed for stainless work-hardening. For pure finishing without interruptions, consider CNMG-FH with AP25N cermet for mirror surface.
What is the largest CN insert you stock for heavy roughing?
Largest: CNMM190624-HX UE6020 (19.0 mm IC, 2.4 mm nose radius, HX heavy chip-breaker). This insert can handle depths of cut up to 6 mm and is specifically designed for interrupted cuts on forged steel. For cast iron heavy roughing, the largest is CNMA120416 UC5115 (12.0 mm IC, 1.6 mm nose radius).
Related Mitsubishi Inserts & Holders
Need a Specific CN 80° Negative Insert Not in Stock?
66 in-stock SKUs covering CNMG / CNMA / CNMM in 7 grades. For specialty CNGG (cermet sharp), CNMA-MM chip-breaker, or specific Mitsubishi equivalent cross-references (Sandvik / Kennametal / Iscar / Walter), request a quote — 24-hour response, 2-3 day dispatch from Zhejiang, DHL/UPS worldwide 3-7 days.
Request a Quote Download Catalog Authenticity Guarantee WhatsApp Engineer