Tungaloy CNMG120404-TM T9115 CVD Coated Carbide Turning Insert for Steel
Tungaloy CNMG120408-TM T9125 CVD Coated Carbide Turning Insert
Tungaloy CNMG120408-TH T9125 Heavy Interrupted Turning Insert
Tungaloy CNMG120404-TM T9125 CVD Coated Carbide Turning Insert
Tungaloy CNMG120404R-S T9125 Right-Hand CVD Coated Turning Insert for Steel
Tungaloy CNMG120404L-S T9125 Left-Hand CVD Coated Turning Insert for Steel
Tungaloy CNMG120408-TM T9115 CVD Coated Carbide Turning Insert for Steel
Tungaloy CNMG120408-SM AH725 PVD Coated Carbide Turning Insert
Tungaloy CNMG120404-SM AH725 PVD Coated Carbide Turning Insert
Tungaloy CNMG120408-TS NS9530 Cermet Turning Insert for Precision Steel Finishing
Tungaloy CNMG120408-37 NS9530 Cermet Turning Insert for Steel Finishing
Tungaloy CNMG120404-TS NS9530 Cermet Turning Insert for Steel Finishing
Tungaloy CNMG120404R-S NS9530 Right-Hand Cermet Turning Insert for Steel
Tungaloy CNMG120404L-S NS9530 Cermet Turning Insert for Precision Finishing
Tungaloy CNMG120404-37 NS9530 Cermet Turning Insert for Finishing Steel
Tungaloy CNGA120408 LX11 Ceramic Turning Insert for Hardened Steel
Tungaloy CNMG190612-TM T9125 Heavy-Duty CVD Coated Carbide Turning Insert
Tungaloy CNMG190612-THS T9125 Heavy Interrupted Turning Insert
Tungaloy CNMG190612-TH T9125 Heavy-Duty Interrupted Turning Insert
Tungaloy CNMG190608-TM T9125 Heavy-Duty CVD Coated Carbide Turning Insert
Tungaloy CNMG160612 T9125 CVD Coated Carbide Turning Insert for Steel
Tungaloy CNMG160608 T9125 CVD Coated Carbide Turning Insert for Steel
Tungaloy CNMG120416-TH T9125 Heavy-Duty CVD Coated Turning Insert
Tungaloy CNMG120412-TH T9125 Heavy Interrupted Turning Insert
Tungaloy CN 80° Diamond Negative Inserts — CNMG Heavy-Duty Steel, Stainless & Ceramic
Genuine Tungaloy CN 80° diamond negative inserts deliver the strongest cutting-edge support among standard turning geometries. The wide 80° point angle and 4 usable edges per insert make CN the workhorse diamond geometry for heavy roughing, profiling, and general turning on steel, stainless, and ceramic applications.
This catalog covers 29 genuine Tungaloy SKUs across CNMG (28) and CNGA ceramic (1) geometry in IC 12.7 mm (CNMG 12), IC 15.875 mm (CNMG 16), and IC 19.05 mm (CNMG 19) sizes. Five grade families are represented: T9115, T9125 (CVD steel), AH725 (PVD stainless), NS9530 (cermet), and LX11 (ceramic).
Browse the full Tungaloy CN 80° diamond negative catalog, or jump to: CVD T9115 · CVD T9125 · PVD AH725 · Cermet NS9530 · Ceramic LX11.
About Tungaloy CN 80° Diamond Negative Inserts
The CN 80° diamond (rhombic) negative geometry is the strongest standard turning geometry for negative-rake CNC turning. With an 80° point angle, 4 usable cutting edges per insert, and a deep negative-rake pocket that provides strong edge support, CN inserts excel at heavy roughing, profiling, and general turning where edge strength matters more than profile versatility.
Key advantages of the CN 80° geometry:
- Strongest cutting edge among standard diamond geometries — better than DN 55° and VN 35° for heavy roughing
- 4 cutting edges per insert — better economy vs 3-edge TN triangles
- Heavy IC size options — CNMG 19 (19.05 mm) supports extreme roughing at high depths-of-cut
- Common tool holder compatibility — fits standard DCLNR/L, PCLNR/L, and MTJNR/L external holders
Tungaloy (Iwate, Japan — IMC Group) supplies the CN family in CNMG (molded chipbreaker) and CNGA (ceramic, no chipbreaker) geometry with five grade families:
- T9115 (CVD P-grade, 5 SKUs): General-purpose steel turning at moderate-to-high speeds
- T9125 (CVD M-K-grade, 13 SKUs): Tough steel, interrupted cuts, and heavy roughing — the most versatile CN grade
- AH725 (PVD universal stainless, 2 SKUs): Stainless 304/316, duplex, and high-Ni alloys
- NS9530 (cermet, 6 SKUs): High-finish steel turning at low-to-medium speeds
- LX11 (ceramic, 1 SKU): High-speed hardened steel and cast iron finishing
All 29 SKUs use the TM chipbreaker for general turning, with TH, THS, TS, S, 37 chipbreakers for specialized applications. R/L (Right/Left) hand designations are available on multiple inserts for Swiss-type and dual-direction turning.
Featured Genuine Tungaloy CN Inserts
Twelve workhorse selections drawn from our 29-SKU Tungaloy CN catalog — covering the most-requested grade + IC + chipbreaker combinations for steel, stainless, cermet, and ceramic work.
CNMG120408-TM T9125 — Tough Steel Workhorse
CVD M-K-grade with 0.8 mm corner radius — the most versatile CN tough steel workhorse. Excellent for medium-to-heavy steel turning.
CNMG120404-TM T9125 — Steel Finishing
Sharp 0.4 mm corner radius for steel finishing. T9125 toughness extends life at sharp edge geometry.
CNMG120408-TH T9125 — Heavy Interrupted
PVD-coated T9125 with TH chipbreaker for heavy interrupted cuts and forging-skin surfaces. Robust edge security.
CNMG120412-TH T9125 — Heavy Steel Roughing
PVD T9125 with 1.2 mm corner radius for heavy steel roughing at high feed. TH chipbreaker for stable chip flow.
CNMG120416-TH T9125 — Heavy-Duty 1.6 mm
PVD T9125 with 1.6 mm corner radius for the heaviest steel roughing at maximum depths-of-cut.
CNMG190612-TM T9125 — Heavy IC 19 mm
Large IC 19.05 mm insert for extreme heavy roughing on tough steel. Maximum depth-of-cut capability.
CNMG190612-THS T9125 — Severe Interrupted
Heavy IC with THS severe chipbreaker for the toughest interrupted-cut conditions. Best edge security for forged surfaces.
CNMG120408-TM T9115 — Steel Workhorse
CVD P-grade for high-speed steel turning. Wear-resistant for finishing-to-medium roughing.
CNMG160612 T9115 — Mid-IC Heavy Steel
Mid-size IC 15.875 mm with 1.2 mm corner radius for heavy steel cutting. No chipbreaker for free-cutting.
CNMG120408-SM AH725 — Stainless Universal
PVD Al-rich grade for stainless 304/316, duplex, and high-Ni alloys. SM chipbreaker for stainless chip control.
CNMG120408-TS NS9530 — Cermet Precision
Cermet with TS chipbreaker for high-precision steel finishing. Achieves Ra 0.4-0.8 µm on carbon and alloy steels.
CNGA120408 LX11 — Ceramic Hardened Steel
SiAlON ceramic insert for high-speed hardened steel and cast iron finishing at 300-600 m/min. Premium finishing grade.
View All 29 Tungaloy CN Inserts →
All Categories — Organized by Grade Family
CVD T9115 — Steel Workhorse (5 SKUs)
Tungaloy's CVD-coated P-grade for general steel turning at moderate-to-high cutting speeds.
- CNMG120404-TM T9115 — steel finishing
- CNMG120408-TM T9115 — general steel turning
- CNMG120412-TM T9115 — heavy steel cutting
- CNMG160608 T9115 (0.8 mm) — mid-IC steel
- CNMG160612 T9115 (1.2 mm) — mid-IC heavy steel
CVD T9125 — Tough Steel / Heavy Roughing (13 SKUs)
Tungaloy's CVD M-K-grade with tougher substrate for steel with light interruptions, forging-skin surfaces, and heavy roughing. The most versatile CN grade.
- CNMG120404-TM T9125 (0.4 mm) — tough steel finishing
- CNMG120408-TM T9125 (0.8 mm) — general tough steel
- CNMG120404R-S T9125 — right-hand 0.4 mm tough steel
- CNMG120404L-S T9125 — left-hand 0.4 mm tough steel
- CNMG120408R-S T9125 — right-hand 0.8 mm tough steel
- CNMG120408L-S T9125 — left-hand 0.8 mm tough steel
- CNMG120408-TH T9125 (TH PVD) — heavy interrupted cuts
- CNMG120412-TH T9125 (TH PVD) — heavy steel roughing
- CNMG120416-TH T9125 (TH PVD, 1.6 mm) — heaviest 12 mm IC
- CNMG160608 T9125 (0.8 mm) — mid-IC tough steel
- CNMG160612 T9125 (1.2 mm) — mid-IC heavy tough steel
- CNMG190608-TM T9125 (0.8 mm) — large IC tough steel
- CNMG190612-TM T9125 (1.2 mm) — large IC heavy duty
- CNMG190612-TH T9125 (TH PVD) — large IC heavy interrupted
- CNMG190612-THS T9125 (THS severe) — large IC severe interrupted
PVD AH725 — Stainless Universal (2 SKUs)
PVD Al-rich grade for stainless steel work.
- CNMG120404-SM AH725 — stainless finishing
- CNMG120408-SM AH725 — stainless general turning
Cermet NS9530 — High-Finish Steel (6 SKUs)
TiC/TiN cermet for high-surface-finish steel turning at low-to-medium cutting speeds.
- CNMG120404-TS NS9530 — sharp TS finishing
- CNMG120404-37 NS9530 — cermet 37 chipbreaker
- CNMG120404R-S NS9530 — right-hand sharp finishing
- CNMG120404L-S NS9530 — left-hand sharp finishing
- CNMG120408-TS NS9530 — sharp 0.8 mm finishing
- CNMG120408-37 NS9530 — cermet 37 with 0.8 mm radius
Ceramic LX11 — Hardened Steel (1 SKU)
SiAlON ceramic insert for high-speed hardened steel and cast iron finishing at 300-600 m/min.
- CNGA120408 LX11 — ceramic hardened steel finishing
Tungaloy CN vs Mitsubishi CNMG — Grade Comparison
Cross-reference table for machinists familiar with the Mitsubishi CNMG family.
| Material | Tungaloy Grade | Coating | Typical Chipbreaker | Mitsubishi Equivalent | Best Application |
|---|---|---|---|---|---|
| Steel (P) | T9115 | CVD TiCN/Al₂O₃ | TM | US7020 / UE6010 | Steel workhorse, finishing to medium roughing |
| Steel (P) | T9125 | CVD TiCN/Al₂O₃ | TM / TH / THS | US7020 / UE6035 | Tough steel, interrupted cuts, heavy roughing |
| Stainless (M) | AH725 | PVD Al-rich | SM | US7020 / VP15TF | Stainless universal |
| Cermet | NS9530 | TiC/TiN cermet | TS / 37 / S | AP25N / RP202 | Steel finishing Ra 0.4-0.8 µm |
| Ceramic | LX11 | SiAlON | (no chipbreaker) | NX2525 | High-speed hardened steel / cast iron finishing |
For the Mitsubishi equivalent family, see Mitsubishi CNMG / DNMG / VNMG / WNMG Negative Turning Inserts.
How to Choose the Right Tungaloy CN Insert
Selecting the correct Tungaloy CN 80° diamond insert involves four decisions:
- Material → Grade: Steel → T9115 (P) or T9125 (M-K). Stainless → AH725. High-finish steel → NS9530 cermet. Hardened steel/cast iron → LX11 ceramic.
- Operation → Chipbreaker: General turning → TM. Heavy roughing → TH or THS. Cermet finishing → TS / 37 / S. Hand-specific (Swiss/dual-direction) → R/L designations.
- IC size → Tool holder: CNMG 12 (12.7 mm) fits 12-13 mm seats. CNMG 16 (15.875 mm) fits 16 mm seats. CNMG 19 (19.05 mm) fits 19-20 mm seats for heavy-duty holders.
- Corner radius → Operation scale: 0.4 mm for finishing, 0.8 mm for general turning, 1.2 mm for heavy roughing, 1.6 mm for heaviest roughing.
Tip: For general steel work, start with CNMG120408-TM T9125. For stainless, use CNMG120408-SM AH725. For heavy roughing, use CNMG190612-TM T9125 with IC 19 mm.
Frequently Asked Questions
What is the difference between CN 80° and DN 55° diamond inserts?
The CN 80° and DN 55° are both rhombic (diamond) negative inserts, but with different point angles. CN 80° has stronger cutting-edge support and is preferred for heavy roughing and general turning where edge strength matters most. DN 55° has a narrower point angle that provides better clearance for profiling and contouring. Use CN when heavy roughing or general turning is the primary operation; use DN when profiling and contouring are primary.
What is the difference between TH and THS chipbreakers?
Both are PVD-coated chipbreakers for steel roughing. TH (Technical Heavy) is for semi-finishing and roughing with stable chip flow at higher feeds. THS (Technical Heavy Severe) is a more robust chipbreaker designed for severe interrupted cuts, forging-skin surfaces, and tough steel applications where edge chipping is a concern. THS has a stronger cutting edge preparation but at slightly higher cutting forces.
What is CNMG 19 and when should I use it?
CNMG 19 has IC 19.05 mm (3/4") and is the largest standard CN insert size. It is used for extreme heavy roughing at high depths-of-cut (up to 8-10 mm) on tough steel, alloy steel, and forging-skin surfaces. The large IC provides maximum edge strength and chip-breaker pocket size, allowing heavier cutting parameters than CNMG 12 or CNMG 16. CNMG 19 requires a larger 19-20 mm tool holder seat.
What does "R" and "L" mean on CNMG inserts?
Right-hand (R) and left-hand (L) designations refer to the cutting direction of the insert. R (right-hand) inserts are standard for most lathe operations, with the cutting edge oriented for standard feed direction. L (left-hand) inserts are needed for Swiss-type lathes, dual-direction turret configurations, or when operator-side clearance is required. Our Tungaloy CNMG catalog stocks both R and L hands for multiple corner-radius + chipbreaker combinations on both T9125 CVD steel and NS9530 cermet grades.
Are these genuine Tungaloy inserts from Japan?
Yes — every insert in this catalog is 100% genuine Tungaloy from Iwate, Japan (part of the IMC Group). All SKUs are sourced directly through authorized distribution channels and include the original Tungaloy packaging and grade markings. Beware of counterfeit Tungaloy inserts sold at suspiciously low prices on marketplaces; these are typically substandard Chinese carbide with copied geometry and inconsistent quality.
What tool holder do I need for CN inserts?
CN 80° inserts (IC 12.7 mm, 15.875 mm, or 19.05 mm) fit standard negative-rake tool holders. Common holders include Tungaloy DCLNR/L and PCLNR/L series for external turning. For CNMG 12 use DCLNR/L 12 holders; CNMG 16 use DCLNR/L 16 holders; CNMG 19 use larger 19-20 mm holders. Browse our turning tool holder catalog for compatible options.
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Related Tungaloy & Mitsubishi Negative Insert Catalogs
Tungaloy DN 55° Diamond Negative
The narrower 55° profiling alternative. DNMG 21 SKUs in stock with T9115/T9125/NS9530 grades.
Tungaloy SN 90° Square Negative
Strongest negative geometry for heavy roughing. SNMG/SNMM 23 SKUs in stock with T9115/T9125/T9225/NS9530.
Tungaloy TN 60° Triangle Negative
The workhorse 60° triangle negative. TNMG/TNGG/TNGA — 55 SKUs across 10 grade families.
Tungaloy VN 35° Diamond Negative
The narrower 35° profiling alternative. VNMG 8 SKUs in stock with T9115/T9125/NS9530 grades.
Mitsubishi CNMG / DNMG / VNMG / WNMG Negative
Mitsubishi cross-brand equivalent — full negative turning family with US7020/UE6020 grades.
Turning Tool Holders — DCLNR / PCLNR
External turning tool holders compatible with CN 80° negative inserts. 12 / 16 / 19 mm seat sizes.
All product names, grade designations, and chipbreaker designations are trademarks of Tungaloy (Iwate, Japan / IMC Group). This catalog is operated by cnchome-beyond.com — Super Industrial Trading Co., Ltd, Hangzhou, China.