Tungaloy DNMG110404-11 NS9530 Cermet Turning Insert for Steel Finishing
Tungaloy DNMG150612-TM T9125 CVD Coated Carbide Turning Insert
Tungaloy DNMG150608-TM T9125 CVD Coated Carbide Turning Insert
Tungaloy DNMG150604-TM T9125 CVD Coated Carbide Turning Insert
Tungaloy DNMG150412-TM T9125 CVD Coated Carbide Turning Insert
Tungaloy DNMG150408-TM T9125 CVD Coated Carbide Turning Insert
Tungaloy DNMG150404-TM T9125 CVD Coated Carbide Turning Insert for Steel
Tungaloy DNMG110408-TM T9125 CVD Coated Carbide Turning Insert
Tungaloy DNMG110404-TM T9125 CVD Coated Carbide Turning Insert
Tungaloy DNMG150612-TM T9115 CVD Coated Carbide Turning Insert
Tungaloy DNMG150608-TM T9115 CVD Coated Carbide Turning Insert for Steel
Tungaloy DNMG150604-TM T9115 CVD Coated Carbide Turning Insert
Tungaloy DNMG150412-TM T9115 CVD Coated Carbide Turning Insert for Steel
Tungaloy DNMG150408-TM T9115 CVD Coated Carbide Turning Insert
Tungaloy DNMG150404-TM T9115 CVD Coated Carbide Turning Insert
Tungaloy DNMG110408-TM T9115 CVD Coated Carbide Turning Insert
Tungaloy DNMG110404-TM T9115 CVD Coated Carbide Turning Insert for Steel
Tungaloy DNMG150408R-S NS9530 Cermet Turning Insert for Steel Finishing
Tungaloy DNMG150404-TS NS9530 Cermet Turning Insert for Steel Finishing
Tungaloy DNMG150404R-S NS9530 Cermet Turning Insert for Precision Finishing
Tungaloy DNMG150404L-S NS9530 Cermet Turning Insert for Finishing
Tungaloy DN 55° Diamond Negative Inserts — DNMG Steel, Stainless & Cermet
Genuine Tungaloy DN 55° diamond negative inserts deliver a balance between the wide clearance of 80° CN inserts and the sharp profile of 35° VN inserts. The 55° point angle provides strong cutting-edge support for general profiling and medium-to-heavy turning on steel, stainless, and high-finish cermet work.
This catalog covers 21 genuine Tungaloy SKUs across DNMG geometry in IC 12.7 mm (DNMG 11) and IC 15.875 mm (DNMG 15) sizes. Three grade families are represented: T9115 and T9125 CVD-coated steel grades plus NS9530 cermet for high-finish steel work.
Browse the full Tungaloy DN 55° diamond negative catalog, or jump to: CVD T9115 · CVD T9125 · Cermet NS9530 · Mitsubishi Equivalent.
About Tungaloy DN 55° Diamond Negative Inserts
The DN 55° diamond (rhombic) negative geometry is the most popular general-purpose diamond insert in CNC turning. With a 55° point angle, 4 usable cutting edges per insert, and a negative rake that provides strong edge support, DN inserts balance profiling versatility with edge strength — making them the workhorse diamond geometry for steel and stainless turning.
Key advantages of the DN 55° geometry:
- Versatile profiling + turning — the 55° point angle is wider than 35° VN (more edge strength) but narrower than 80° CN (more clearance for profiling)
- Strong negative-rake edge — handles interrupted cuts and tough steel better than positive-rake geometries
- 4 cutting edges per insert — good economy vs 3-edge TN triangles
- Common tool holder compatibility — fits standard DDJNR/L, DCLNR/L, and DVJNR/L external holders
Tungaloy (Iwate, Japan — IMC Group) supplies the DN family in DNMG (molded chipbreaker) geometry with three grade families:
- T9115 (CVD P-grade, 8 SKUs): General-purpose steel turning at moderate-to-high speeds
- T9125 (CVD M-K-grade, 8 SKUs): Tougher steel, interrupted cuts, and forging-skin applications
- NS9530 (cermet, 5 SKUs): High-finish steel turning at low-to-medium speeds
All 21 SKUs use the TM chipbreaker for general turning, with TS, S, and 11 chipbreakers for the cermet finishing line. R/L (Right/Left) hand designations are available on cermet inserts for Swiss-type lathe and dual-direction turning applications.
Featured Genuine Tungaloy DN Inserts
Twelve workhorse selections drawn from our 21-SKU Tungaloy DN catalog — covering the most-requested grade + corner-radius combinations for steel, stainless, and high-finish cermet work.
DNMG150408-TM T9115 — Steel Workhorse
CVD P-grade with 0.8 mm corner radius — the most versatile DN steel workhorse. Excellent for medium steel turning at high speeds.
DNMG150404-TM T9115 — Steel Finishing
Sharp 0.4 mm corner radius for steel finishing. T9115 wear resistance extends life at sharp edge geometry.
DNMG150612-TM T9115 — Heavy Steel
1.2 mm corner radius for heavy steel cutting at high feed. TM balances wear + chip control at deeper depths-of-cut.
DNMG150408-TM T9125 — Tough Steel
T9125 CVD with tougher substrate for tough steel and stainless. Better edge security than T9115 in difficult conditions.
DNMG150612-TM T9125 — Heavy Tough Steel
T9125 with 1.2 mm corner radius for heavy roughing on tough steel and forging-skin surfaces.
DNMG110408-TM T9125 — Smaller IC Tough Steel
Smaller IC 12.7 mm insert for tight-spaced profiling. T9125 toughness for general tough steel turning.
DNMG150408-TS NS9530 — Cermet Steel Finish
Cermet with TS chipbreaker for finishing steel at Ra 0.4-0.8 µm. Sharp edge delivers mirror-finish quality.
DNMG150404-TS NS9530 — Sharp Cermet Finish
Sharp 0.4 mm corner radius cermet for precision steel finishing. TS chipbreaker for clean chip flow at low feeds.
DNMG150408R-S NS9530 — Right-Hand Cermet
Right-hand cermet with S chipbreaker for Swiss-type and dual-direction lathe finishing operations.
DNMG150404L-S NS9530 — Left-Hand Cermet
Left-hand cermet for finishing on Swiss-type lathes and reverse-direction turning. 0.4 mm corner for precision.
DNMG110404-TM T9115 — High-Speed Small IC
Small IC 12.7 mm insert for high-speed steel turning. T9115 CVD optimized for high Vc operations.
DNMG110404-11 NS9530 — Precision Cermet
Smaller IC cermet with 11 chipbreaker for precision steel finishing at very low feeds. Sub-micron surface finish capability.
View All 21 Tungaloy DN Inserts →
All Categories — Organized by Grade Family
CVD T9115 — Steel Workhorse (8 SKUs)
Tungaloy's CVD-coated P-grade for general steel turning at moderate-to-high cutting speeds. Wear-resistant for finishing-to-medium roughing on carbon and alloy steels.
- DNMG150404-TM T9115 (0.4 mm) — steel finishing
- DNMG150408-TM T9115 (0.8 mm) — general steel turning
- DNMG150412-TM T9115 (1.2 mm) — heavy steel cutting
- DNMG150604-TM T9115 (0.4 mm) — small thickness steel
- DNMG150608-TM T9115 (0.8 mm) — small thickness general
- DNMG150612-TM T9115 (1.2 mm) — small thickness heavy
- DNMG110404-TM T9115 (small IC 04) — small IC high-speed steel
- DNMG110408-TM T9115 (small IC 08) — small IC general steel
CVD T9125 — Tough Steel (8 SKUs)
Tungaloy's CVD M-K-grade with tougher substrate for steel with light interruptions, forging-skin surfaces, and tough stainless work. The most versatile DN grade.
- DNMG150404-TM T9125 (0.4 mm) — tough steel finishing
- DNMG150408-TM T9125 (0.8 mm) — general tough steel
- DNMG150412-TM T9125 (1.2 mm) — tough steel heavy cutting
- DNMG150604-TM T9125 (0.4 mm) — small thickness tough steel
- DNMG150608-TM T9125 (0.8 mm) — small thickness tough steel
- DNMG150612-TM T9125 (1.2 mm) — small thickness tough heavy
- DNMG110404-TM T9125 (small IC) — small IC tough steel
- DNMG110408-TM T9125 (small IC) — small IC general tough steel
Cermet NS9530 — High-Finish Steel (5 SKUs)
TiC/TiN cermet for high-surface-finish steel turning at low-to-medium cutting speeds. Achieves Ra 0.4-0.8 µm on carbon and alloy steels. R/L hand designations available for Swiss-type and dual-direction lathes.
- DNMG150404-TS NS9530 — sharp TS finishing
- DNMG150404R-S NS9530 — right-hand sharp finishing
- DNMG150404L-S NS9530 — left-hand sharp finishing
- DNMG150408R-S NS9530 — right-hand 0.8 mm finishing
- DNMG110404-11 NS9530 — small IC precision cermet
Tungaloy DN vs Mitsubishi DNMG — Grade Comparison
Cross-reference table for machinists familiar with the Mitsubishi DNMG family. Use this to translate Tungaloy grade selection to equivalent Mitsubishi grades.
| 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 | US7020 / UE6035 | Tough steel, interrupted cuts, forging skin |
| Cermet | NS9530 | TiC/TiN cermet | TS / S / 11 | AP25N / RP202 | Steel finishing Ra 0.4-0.8 µm |
For the Mitsubishi equivalent family, see Mitsubishi CNMG / DNMG / VNMG / WNMG Negative Turning Inserts.
How to Choose the Right Tungaloy DN Insert
Selecting the correct Tungaloy DN 55° diamond insert involves four decisions:
- Material → Grade: Steel → T9115 (P) or T9125 (M-K). High-finish steel profiling → NS9530 cermet.
- Operation → Chipbreaker: General turning → TM. Finishing → TS or S (with R/L hand for Swiss-type). Precision finishing → 11.
- IC size → Tool holder: DNMG 11 (12.7 mm) fits 12-13 mm seats. DNMG 15 (15.875 mm) fits 16 mm seats for heavier holders.
- Corner radius → Operation scale: 0.4 mm for finishing, 0.8 mm for general turning, 1.2 mm for heavy roughing.
Tip: For general steel work, start with DNMG150408-TM T9125. For high-finish steel, use DNMG150408-TS NS9530 cermet.
Frequently Asked Questions
What is the difference between DN 55° and CN 80° diamond inserts?
The DN 55° and CN 80° are both rhombic (diamond) negative inserts, but with different point angles. DN 55° provides better clearance for profiling and contouring — making it the geometry of choice for components with non-cylindrical features. CN 80° has stronger cutting-edge support and is preferred for heavy roughing and general turning where edge strength matters more than profile versatility. Use DN when profiling is required; use CN for heavy roughing and general turning.
How does T9125 compare to T9115?
Tungaloy's two CVD-coated steel grades differ in substrate and coating thickness. T9115 is the P-grade (P10-P25) optimized for wear resistance at higher cutting speeds on stable setups. T9125 is the M-K-grade (P20-P35) with a tougher substrate and thicker coating for better edge security on interrupted cuts, forging-skin surfaces, and tough steel work. Choose T9115 for productivity on stable steel turning; choose T9125 for tough conditions.
What is the difference between DNMG 11 and DNMG 15?
The DNMG 11 and DNMG 15 designations refer to different insert sizes. DNMG 11 has IC 12.7 mm (1/2") and is used for smaller profiles, tight-spaced machining, and Swiss-type lathes. DNMG 15 has IC 15.875 mm (5/8") and is the more common general-purpose size for medium-to-heavy turning. Both share the same DN 55° point angle and use TM / TS / S / 11 chipbreakers — only the IC and thickness differ.
What does the "R" and "L" designation mean on cermet 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 an operator-side clearance is required. Our Tungaloy DNMG cermet catalog stocks both R and L hands for the 150404 corner radius to give you maximum flexibility for finishing operations.
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 DN inserts?
DN 55° inserts (IC 12.7 mm or 15.875 mm) fit standard negative-rake tool holders. Common holders include Tungaloy DDJNR/L and DCLNR/L series for external turning. For DNMG 11 (IC 12.7 mm), use DDJNR/L 11 holders; for DNMG 15 (IC 15.875 mm), use DCLNR/L 15 holders. Browse our turning tool holder catalog for compatible options.
Need Help Selecting the Right DN Insert?
Tell us your workpiece material, operation type, and cutting parameters — we'll recommend the correct Tungaloy grade + chipbreaker within 24 hours.
Request a Quote WhatsApp a Specialist Download Grade Catalog Mitsubishi DN Equivalent
Related Tungaloy & Mitsubishi Negative Insert Catalogs
Tungaloy CN 80° Round Negative
The wider 80° round negative for heavy roughing on tough materials. CNMG/CNMA often paired with DN for profiling+roughing.
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 — DDJNR / DCLNR
External turning tool holders compatible with DN 55° negative inserts. 12 mm and 16 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.