Mitsubishi CNMG120408-MJ VP05RT PVD Insert for Super Alloys (10pcs)
Mitsubishi CNMG120408-MH UE6020 Carbide Turning Insert (10pcs)
Mitsubishi CNMG120408-MA VP15TF Miracle PVD Insert for Stainless & Steel
Mitsubishi CNMG120408-MA US735 Stainless Steel Turning Insert (10pcs)
Mitsubishi CNMG120408-GH US735 Stainless Steel Roughing Insert (10pcs)
Mitsubishi CNMG120408-MA UE6110 High-Speed Steel Turning Insert (10pcs)
Mitsubishi CNMG120408-MA UE6020 Carbide Turning Insert for Steel (10pcs)
Mitsubishi CNMG120408-MA UC5115 Cast Iron Turning Insert (10pcs)
Mitsubishi CNMG120408-MA MC6025 Carbide Turning Insert for Steel (10pcs)
Mitsubishi CNMG120408-MA MC6015 High-Speed Steel Turning Insert (10pcs)
Mitsubishi CNMG120408-GM MC7025 Stainless Steel Turning Insert (10pcs)
Mitsubishi CNMG120408-GK MC5015 Cast Iron Turning Insert (10pcs)
Mitsubishi CNMG120408-GK MC5005 High-Speed Cast Iron Insert (10pcs)
Mitsubishi CNMG120408-GH UE6020 Heavy Roughing Insert (10pcs)
Mitsubishi CNMG120408 UC5115 CVD Carbide Turning Insert for Cast Iron (10pcs)
Mitsubishi CNMG120408 UC5105 High-Speed Cast Iron Turning Insert (10pcs)
Mitsubishi CNMG120408 NX2525 Cermet Turning Insert for Steel (10pcs)
Mitsubishi CNMG120404-SH NX2525 Cermet Finishing Insert (10pcs)
Mitsubishi CNMM190624-HX UE6020 Heavy Duty Roughing Insert (10pcs)
Mitsubishi CNMG120412 UC5115 CVD Carbide Insert for Heavy Cast Iron Roughing
Mitsubishi CNMG190616-MA US735 Heavy-Duty Stainless Steel Insert (10pcs)
Mitsubishi CNMG190612-MA US735 Heavy Duty Stainless Steel Insert (10pcs)
Mitsubishi DNMG150404-MA US735 Carbide Insert for Stainless Steel
Mitsubishi DNMG150404-MA UE6020 Carbide Steel Turning Insert
Mitsubishi Negative Turning Inserts — 277 Genuine SKUs in Stock
Factory-direct supply of 277 genuine Mitsubishi Materials negative-type turning inserts in stock at CNCHome-Beyond, covering 14 ISO shape families (CNMG / DNMG / VNMG / WNMG / TNMG / SNMG and more) and 22 grades for steel, stainless steel, cast iron, and high-temperature alloys. Every insert is double-sided (0° clearance) for maximum edge count, manufactured in Japan under ISO 1832, and shipped globally at 30-50% below OEM list price.
- 100% genuine Mitsubishi Materials — sourced directly from the Japan factory, hologram-sealed boxes, traceable lot numbers
- 30-50% below OEM list price — factory-direct pricing with no middleman markup
- ISO 1832 standard compliant — every insert follows the international turning insert designation system
- Free global shipping — DHL / UPS / FedEx 3-7 day delivery to 50+ countries
- Volume discounts — 2-9 pieces 6% off, 10+ pieces 12% off
What is a “Negative” Turning Insert?
In the ISO 1832 insert designation system, the second letter “N” stands for a 0° clearance angle, which means the insert is double-sided (two usable cutting faces). Compared to positive 7° clearance inserts (single-sided, designated by “P” or “G”), negative inserts deliver:
- 50%-100% more cutting edges per insert — CNMG has 8 edges, WNMG has 6 edges, vs only 4 edges on a single-sided CNMA/CCMT-style insert
- Thicker, stronger body — 4.76 mm or 6.35 mm thickness absorbs cutting shock and dissipates heat faster, ideal for heavy-duty roughing and interrupted cuts
- Higher rigidity — 0° clearance provides a robust negative geometry that resists deflection under high radial forces
Trade-off: Negative inserts require more spindle horsepower (cutting forces are higher) and are not ideal for slender, thin-walled workpieces that are sensitive to vibration. For those applications, see our Mitsubishi positive turning inserts collection instead.
ISO Nomenclature Decoded (Negative Turning Example)
Take CNMG120408-MA UE6110 — the industry’s most popular negative turning insert:
| Code | Meaning |
|---|---|
| C | Shape: 80° square (rhombic) — the most common negative geometry for general turning |
| N | Clearance angle: 0° (negative, double-sided) |
| M | Tolerance class: medium (M-class) precision ground |
| G | Type: hole + chip-breaker on both faces (double-sided) |
| 12 | Inscribed circle (IC) = 12.7 mm (1/2 inch) |
| 04 | Thickness = 4.76 mm (3/16 inch) |
| 08 | Nose radius = 0.8 mm (1/32 inch) |
| MA | Chip-breaker: medium roughing/finishing geometry |
| UE6110 | Grade: Mitsubishi CVD coated carbide for high-speed steel turning (P10-P25) |
14 ISO Shape Families in Stock
Mitsubishi’s negative turning insert lineup spans 14 ISO shape families, each engineered for a specific application. The most popular are listed first:
| Shape | Geometry | Cutting Edges | Best For |
|---|---|---|---|
| CNMG | 80° square (rhombic) | 8 | General-purpose turning of steel / stainless / cast iron, the most common shop floor workhorse |
| WNMG | 80° trigon | 6 | High-economy finishing & medium roughing, 50% cheaper per edge than CNMG |
| DNMG | 55° diamond | 4 | Profiling and contour turning, smaller contact angle reduces radial force |
| VNMG | 35° diamond | 4 | Precision profiling, copy turning, finishing on complex contours |
| TNMG | 60° triangle | 6 | Profiling, semi-finishing, good for shafts with shoulders and chamfers |
| SNMG | 90° square | 8 | Heavy-duty roughing, large depths of cut (up to 8 mm), high MRR on big shafts |
| CNMA | 80° square (no chip-breaker) | 8 | Customer-specific chip-breaker grinding, custom profiling |
| CNMM | 80° heavy-duty square | 8 | Extreme roughing of forged / cast steel, max depth 10+ mm |
| SNMA | 90° square (no chip-breaker) | 8 | Custom profiling on heavy shafts |
| TNMA | 60° triangle (no chip-breaker) | 6 | Custom profiling on moderate shafts |
| WNMA | 80° trigon (no chip-breaker) | 6 | Custom grinding on profiled parts |
| SNMG-S / SNMM | 90° super-duty | 8 | Railway, mining, heavy machinery turning |
| DCMT | 55° diamond 7° pos | 2 | Cross-over part (small batch negative-feel parts in 7° pocket) |
| VNGG / TNGG | 35° / 60° negative no-chip | 4 | Custom profiling on aluminum & cast iron with bespoke geometry |
Top 8 Grades in Stock (22 Total)
Mitsubishi’s grade portfolio is organized by workpiece ISO group (P = steel, M = stainless, K = cast iron, S = high-temp alloys). The 8 most common grades cover ~90% of all turning applications:
| Grade | Coating | Workpiece (ISO) | Best Application |
|---|---|---|---|
| UE6110 | CVD TiCN-Al2O3-TiN | P10-P25 (steel) | High-speed continuous steel turning, the signature Mitsubishi steel grade, 30-50% longer tool life than generic P20-P30 |
| UE6020 | CVD multi-layer | P20-P35 (steel) | General-purpose steel turning, balanced wear + toughness, the universal shop-floor choice |
| UE6120 | CVD tough substrate | P25-P40 (steel) | Interrupted cuts, keyways, cross-holes, unstable setups |
| UC5115 | CVD black super-coat | K05-K15 (cast iron) | High-speed gray / ductile cast iron, the cast iron master grade |
| US735 | CVD tough | M20-M35 (stainless) + K | Stainless steel turning with interrupted cuts, cross-holes |
| US7020 | CVD steel | P20-P30 (steel) | Steel finishing & medium turning, also used for threading |
| VP15TF | PVD TiAlN (Miracle coat) | P15-M25 (steel + stainless) | Universal PVD grade, the most versatile Mitsubishi insert, runs on virtually any workpiece below 220 m/min |
| MP735 | PVD nano-layer | M15-M30 (stainless) | Stainless steel specialist, sharper edge than US735, prevents built-up edge (BUE) on 304/316 |
| Additional 14 grades stocked: MC5005, MC5015, MC6015, MC6025, MC6035, MC7025, MP9005, UC5105, UE6010, UE6105, NX2525 (cermet), AP25N (cermet), VP05RT, VP10RT | |||
Compatible Tool Holders
Every negative insert requires a matching tool holder (also called a turning tool block or boring bar). Mitsubishi-style holders follow ISO 5608 nomenclature:
| Insert Shape | External Holder (Right-Hand) | Internal Boring Bar | Shank Sizes |
|---|---|---|---|
| CNMG 12 | DCLNR/L 2020K-12, 2525M-12 | S25R-DCLNR-12, A25R-DCLNR-12 | 20 / 25 mm |
| CNMG 16 / 19 | DCLNR/L 2525M-16, 3232P-19 | S32S-DCLNR-16, S40T-DCLNR-19 | 25 / 32 / 40 mm |
| DNMG 11 | DDJNR/L 1616H-11, 2020K-11 | A16M-DDJNR-11, S20S-DDJNR-11 | 16 / 20 / 25 mm |
| DNMG 15 | DDJNR/L 2020K-15, 2525M-15 | S25R-DDJNR-15, S32S-DDJNR-15 | 20 / 25 / 32 mm |
| VNMG 16 | DVJNR/L 2020K-16 | A20R-DVJNR-16, S25S-DVJNR-16 | 20 / 25 mm |
| WNMG 08 | DWLNR/L 2020K-08, 2525M-08 | S25R-DWLNR-08 | 20 / 25 mm |
| TNMG 16 | DTJNR/L 2020K-16 | S25R-DTJNR-16 | 20 / 25 mm |
| SNMG 12 | DSBNR/L 2020K-12, 2525M-12 | S25R-DSBNR-12 | 20 / 25 mm |
Recommended Cutting Parameters (Starting Point)
Always run a test cut before committing to a production run. These values are starting points for stable CNC lathe setups with adequate coolant:
| Grade | Workpiece | Cutting Speed Vc (m/min) | Feed f (mm/rev) | Depth ap (mm) |
|---|---|---|---|---|
| UE6110 | Carbon steel (1045 / S45C) | 250 - 450 | 0.10 - 0.35 | 0.5 - 3.0 |
| UE6020 | Low carbon steel | 150 - 300 | 0.10 - 0.35 | 0.5 - 3.0 |
| UE6120 | Alloy steel (4140 / SCM440) | 120 - 240 | 0.15 - 0.45 | 0.8 - 4.5 |
| UC5115 | Gray cast iron (HT250) | 150 - 350 | 0.05 - 0.20 | 0.2 - 1.5 |
| VP15TF | Stainless steel (304 / 316) | 100 - 200 | 0.10 - 0.30 | 0.3 - 2.5 |
| MP735 | Austenitic stainless (304 / 316) | 100 - 200 | 0.12 - 0.35 | 0.5 - 3.0 |
| US735 | Martensitic stainless (420 / 440C) | 90 - 180 | 0.10 - 0.25 | 0.3 - 2.0 |
| NX2525 (Cermet) | Carbon / alloy steel finishing | 180 - 420 | 0.05 - 0.15 | 0.1 - 0.8 |
Negative vs Positive Inserts: When to Choose Each
| Factor | Negative (this collection) | Positive |
|---|---|---|
| Edges per insert | 4 - 8 (50%-100% more) | 2 - 4 |
| Body thickness | 4.76 - 6.35 mm (stronger) | 2.38 - 4.76 mm |
| Cutting forces | Higher (requires rigid setup) | Lower (good for thin parts) |
| Best for | Heavy roughing, interrupted cuts, high-MRR production | Finishing, slender shafts, vibration-sensitive workpieces |
| Typical shapes | CNMG, DNMG, VNMG, WNMG, TNMG, SNMG | CCMT, DCMT, TCMT, VBMT, TPMT |
| Per-edge cost | Lower (more edges) | Higher (fewer edges) |
| Coolant requirement | Standard flood or HP coolant | Same |
Browse our Mitsubishi positive turning inserts collection if you need single-sided 7° clearance inserts for finishing or thin-wall work.
Tool Holder Setup and Shim Sizing
Negative inserts are typically paired with an insert thickness shim on the holder, which provides additional chip-breaker support and protects the holder pocket from wear. For CNMG 12 inserts, the shim is typically 1.2 mm; for CNMG 16, it’s 1.6 mm. Match the shim IC to the insert IC and verify the shim screw thread (M3 / M3.5 / M4) when ordering replacements.
Frequently Asked Questions
Q: What does the “N” in CNMG stand for?
The second letter “N” in any ISO insert designation indicates a 0° clearance angle, which means the insert is double-sided. This is in contrast to “P” (11° positive) or “G” (7° positive) inserts that are single-sided. Negative inserts provide 2x the cutting edges per insert, making them more economical for high-volume production.
Q: Can I use a negative insert on aluminum?
Technically yes, but it’s not ideal. Aluminum has low cutting temperatures and the extra body mass of a negative insert can cause chatter on aluminum workpieces. We recommend using positive inserts with sharp edges (no chip-breaker) for aluminum. See our Mitsubishi positive turning collection for grades like HTI10.
Q: How do I know when to switch from CNMG to WNMG?
CNMG (80° square, 8 edges) is the universal workhorse. WNMG (80° trigon, 6 edges) offers different chip-breaker options and is often more cost-effective when you can’t fully utilize all 8 edges of a CNMG (e.g., for short production runs). WNMG also has a stronger corner geometry, making it better for interrupted cuts.
Q: What is the difference between UE6110 and UE6020?
Both are Mitsubishi CVD coated grades for steel turning. UE6110 has a thicker Al2O3 coating layer optimized for high-speed continuous turning (Vc 250-450 m/min) with maximum wear resistance. UE6020 is a tougher, more universal grade for general turning with moderate speeds (Vc 150-300 m/min) and slight interruptions. Choose UE6110 for high-MRR production; choose UE6020 for job-shop flexibility.
Q: Are these inserts compatible with non-Mitsubishi holders?
Yes. Mitsubishi negative inserts follow the ISO 1832 standard, which is the same as Sandvik, Kennametal, Iscar, Walter, and other major brands. The pocket geometry, IC size, and thickness are identical. As long as your holder accepts the same insert shape (e.g., CNMG 120408), the Mitsubishi insert will fit.
Q: Do you offer custom grade selection consulting?
Yes. For complex work (Inconel, hardened steel >HRC 55, exotic alloys, or large batch optimization), our engineers can recommend the optimal grade + chip-breaker combination. Contact us at chao@cnchome-beyond.com or WhatsApp +86 159 9066 3752 with your workpiece material, hardness, and current tool life.
Shop Related Mitsubishi Collections
Browse the full Mitsubishi Materials catalog at CNCHome-Beyond:
- Mitsubishi Materials Brand Page — all Mitsubishi product lines, history, and engineering support
- Mitsubishi Master Catalog — all Mitsubishi products (currently re-organizing into sub-collections)
- Mitsubishi Positive Turning Inserts — CCMT / DCMT / TCMT / VBMT 7° clearance single-sided inserts for finishing
- Mitsubishi Threading Inserts — 16ER / 16IR / 11ER / 22ER threading inserts in US7020 + VP15TF
- Mitsubishi Milling Inserts — 115 SKUs of APKT / AOMT / SEKT / SNKT milling cutters
Other Global Brand Negative Turning Inserts
CNCHome-Beyond also stocks equivalent negative turning inserts from the world’s top 3 carbide brands. Compare grades, lead times, and pricing:
- KORLOY Master Catalog — 557 SKUs (CNMG / DNMG / VNMG / WNMG / TNMG / SNMG) in grades NC3225, NC3030, NC9125, PC8110
- KORLOY Brand Page — Korean carbide manufacturer, ISO 9001 certified, 12 grades for steel / stainless / cast iron
- Tungaloy Master Catalog — 443 SKUs (CNMG / DNMG / VNMG / WNMG) in T9000-series CVD and AH8000-series PVD grades
- Tungaloy Brand Page — Japanese carbide specialist, 90+ years in cutting tools
- TaeguTec Master Catalog — full turning + milling + drilling lineup in TT7000 / TT9080 / TT5515 grades
- TaeguTec Brand Page — Korean multinational, ISCAR group sister brand
Shop More from CNCHome-Beyond
- Premium Carbide Inserts (All Global Brands) — 5,880 SKUs across 8 brands (Sandvik / Mitsubishi / Tungaloy / KORLOY / Iscar / Kyocera / OYYU / BEYOND)
- Best Sellers — 248 top-selling inserts, end mills, and tool holders across all brands
- Accessories for Indexable Holders — 155 SKUs of shims, screws, wrenches, and torque clamps for turning & milling holders
Need a Mitsubishi Insert Not Listed? Request a Quote
Our engineering team can source any Mitsubishi Materials grade or special geometry (e.g., CNMG120408-NF, DNMG150612R, custom chip-breaker) within 7-14 days from Japan factory direct.