Tungaloy VNMG160412-TM T9125 Turning Insert | 35° Rhombic Robust Steel Cutting
Tungaloy VNMG160408-TM T9125 Turning Insert | 35° Rhombic Steel Cutting
Tungaloy VNMG160404-TM T9125 Turning Insert | 35° Rhombic Carbide for Steel
Tungaloy VNMG160412-TM T9115 CNC Turning Insert for Steel (ISO P), CVD Coated Carbide
Tungaloy VNMG160408-TM T9115 Turning Insert | 35° Rhombic Steel Cutting
Tungaloy VNMG160408-TS NS9530 Cermet Turning Insert | 35° Rhombic Steel Finishing
Tungaloy VNMG160404-TS NS9530 Cermet Turning Insert | 35° Rhombic Finishing
Tungaloy VNMG160404-11 NS9530 Cermet Turning Insert | 35° Rhombic
Tungaloy VN 35° Diamond Negative Inserts — VNMG Profiling, Contour & Facing
Genuine Tungaloy VN 35° diamond negative inserts for profiling, contour turning, and facing operations where a sharp point and reduced cutting forces are essential. The narrow 35° point angle provides excellent clearance for forming complex profiles, fillets, and small-diameter features on steel and stainless components.
This catalog covers 8 genuine Tungaloy SKUs — all VNMG (molded chipbreaker) geometry in IC 9.525 mm (1604/1608/1612). Three grade families are represented: T9115 and T9125 CVD-coated steel grades for profiling and roughing, plus NS9530 cermet for high-finish steel profiling.
Browse the full Tungaloy VN 35° diamond negative catalog, or jump to: CVD Steel (T9115/T9125) · Cermet Finishing (NS9530) · Mitsubishi Equivalent · FAQ.
About Tungaloy VN 35° Diamond Negative Inserts
The VN 35° diamond negative geometry is the sharpest, narrowest insert shape in standard CNC turning. With a 35° point angle, VN inserts provide superior clearance for profiling, contouring, and undercut operations — making them the geometry of choice for forming complex profiles, tapered features, and small-diameter necks on turned components.
The narrow point also reduces radial cutting forces, which translates to:
- Lower vibration on long, slender shafts and thin-walled components
- Better surface finish at higher feed rates on profiled surfaces
- Reduced tendency for built-up edge (BUE) on soft or gummy materials
- Excellent chip control in finishing operations with shallow depths of cut
Tungaloy (Iwate, Japan — part of the IMC Group) supplies the VN family primarily in VNMG (molded chipbreaker) geometry for negative-rake profiling on a wide range of CNC lathes and Swiss-type machines. Our catalog covers 3 grade families:
- T9115 (CVD P-grade, 2 SKUs): Steel profiling at moderate-to-high speeds with TM chipbreaker
- T9125 (CVD M-K-grade, 3 SKUs): Tougher steel profiling and interrupted-cut applications with TM chipbreaker
- NS9530 (cermet, 3 SKUs): High-finish steel profiling at low-to-medium speeds with TS and 11 chipbreakers
All 8 SKUs use IC 9.525 mm (1604 / 1608 / 1612) and are compatible with standard 16 mm negative-rake tool holders.
Complete VN 35° Diamond Negative Catalog — All 8 Genuine Tungaloy SKUs
All 8 VNMG inserts currently in stock, organized by grade family. Each card links to the product page with full specifications, stock count, and pricing.
CVD Steel — T9115 / T9125 (5 SKUs)
CVD-coated grades for steel profiling at moderate-to-high cutting speeds. T9115 is the P-grade workhorse (wear-resistant); T9125 is the M-K-grade (tougher substrate for interrupted cuts and forging-skin applications).
VNMG160412-TM T9115 — Heavy Steel Profiling
CVD P-grade with 1.2 mm corner radius for heavy steel profiling at high feed. TM chipbreaker balances wear + chip control.
VNMG160408-TM T9115 — Steel Profiling
Standard 0.8 mm corner radius for medium steel profiling. The most versatile T9115 VNMG option for general-purpose work.
VNMG160412-TM T9125 — Heavy Tough Steel
T9125 CVD with tougher substrate for heavy profiling on interrupted cuts and forging-skin surfaces. Best edge security in tough conditions.
VNMG160408-TM T9125 — Steel Profiling
T9125 standard 0.8 mm corner radius for steel profiling with extra toughness. Excellent for stainless and alloy steel profiles.
VNMG160404-TM T9125 — Steel Finishing Profile
Sharp 0.4 mm corner radius for finishing steel profiles. T9125 toughness extends tool life even at sharp edge geometry.
Cermet Finishing — NS9530 (3 SKUs)
TiC/TiN cermet grade for high-surface-finish steel profiling at low-to-medium cutting speeds. NS9530 delivers excellent wear life and chip control for finishing-profile operations on carbon and alloy steels.
VNMG160408-TS NS9530 — Cermet Profile Finishing
Cermet with TS chipbreaker for finishing steel profiles at Ra 0.4–0.8 µm. 0.8 mm corner radius balances edge strength and finish.
VNMG160404-TS NS9530 — Sharp Cermet Profile
Sharp 0.4 mm corner radius cermet for mirror-finish steel profiling. TS chipbreaker provides clean chip flow at low feeds.
VNMG160404-11 NS9530 — Precision Cermet
NS9530 cermet with 11 chipbreaker for precision steel profiling at very low feeds. Achieves sub-micron surface finishes on carbon steel.
View All 8 Tungaloy VN Inserts →
VN 35° Diamond Negative — Typical Applications
The VN 35° geometry is purpose-built for operations where standard 55°/60°/80° inserts can't reach. The narrow point angle delivers low radial cutting forces and superior clearance for the following applications:
Profiling & Contour Turning
Forming complex axial profiles, tapered features, and contoured surfaces on shafts, hubs, and turned components. The 35° point angle provides clearance for forming transitions and undercuts that wider geometries can't access.
Facing on Thin Sections
Radial facing on thin-walled components, flanges, and disk-shaped parts. VN's low radial forces minimize deflection and chatter on flexible workpieces where stronger geometries might cause vibration.
Small-Diameter Necking
Forming small-diameter necks, grooves, and relief features between larger diameter sections. The narrow VN point reaches into tight spaces without rubbing on adjacent surfaces.
Swiss-Type Lathe Profiling
High-precision profiling on Swiss-type lathes for medical, electronics, and small-mechanical components. The 35° point pairs well with the small tool envelope and high RPM typical of Swiss machining.
Finishing at High Surface Quality
Cermet NS9530 inserts achieve Ra 0.4–0.8 µm surface finish on carbon and alloy steel profiles. Ideal for hydraulic components, bearing seats, and sealing surfaces where finish quality is critical.
Automotive & Aerospace Components
Profiling turned components for automotive (drive shafts, gear blanks) and aerospace (landing gear pins, hydraulic fittings). VN provides the geometry flexibility needed for forming complex certified-component profiles.
Tungaloy VN vs Mitsubishi VNMG — Grade Comparison
Cross-reference table for machinists familiar with the Mitsubishi VNMG 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 | Steel profiling at moderate speeds |
| Steel (P) | T9125 | CVD TiCN/Al₂O₃ | TM | UE6035 / US7020 | Tough steel profiling, interrupted cuts |
| Cermet | NS9530 | TiC/TiN cermet | TS / 11 | AP25N / RP202 | Steel profile finishing at 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 VN Insert
The VN 35° diamond geometry is specialized for profiling, contouring, and small-diameter features. Selection involves three decisions:
- Material → Grade: Carbon/alloy steel → T9115 (P-grade) or NS9530 (cermet finishing). Tough/interrupted steel → T9125 (M-K-grade, tougher substrate).
- Surface finish requirement → Chipbreaker: General profiling → TM. High-finish profiling → TS. Precision mirror-finish → 11.
- Corner radius → Profile scale: 0.4 mm radius (04) for sharp profiles and small fillets. 0.8 mm radius (08) for general profiling. 1.2 mm radius (12) for heavy profiling and stronger edge.
Tip: When in doubt for general steel profiling, start with VNMG160408-TM T9125. For finishing steel profiles at high surface quality, use VNMG160408-TS NS9530.
Frequently Asked Questions
When should I use a VN 35° diamond insert instead of DN 55° or TN 60°?
The VN 35° geometry is the most specialized of the three. It provides superior clearance for profiling, contouring, and undercut operations that the wider 55° or 60° geometries can't reach. However, VN inserts have weaker cutting-edge strength than DN or TN — so they should be reserved for profiling and finishing, not heavy roughing. Use VN when forming complex profiles, tapered features, or small-diameter necks. Use TN or DN for general turning and roughing where edge strength matters more.
What is the difference between T9115 and T9125 grades?
Tungaloy's CVD-coated steel grades differ in substrate toughness and coating thickness. T9115 (P-grade) is optimized for wear resistance at higher cutting speeds on stable setups — best for finishing-to-medium roughing of carbon and alloy steels. T9125 (M-K-grade) has a tougher substrate with thicker coating, making it better for interrupted cuts, forging-skin surfaces, and tougher stainless steel work where edge chipping is a concern. Choose T9115 for productivity on stable setups; choose T9125 for tough conditions.
What is NS9530 cermet and when should I use it?
NS9530 is Tungaloy's TiC/TiN cermet grade — a ceramic-metal composite that's harder than coated carbide but tougher than pure ceramic. Cermet delivers exceptional surface finish at low-to-medium cutting speeds (typically 100–250 m/min), with minimal BUE and superior wear life on steel profiling operations. Use NS9530 for finishing steel profiles where surface quality (Ra 0.4–0.8 µm) is critical. Avoid cermet on interrupted cuts, stainless steel, or aluminum — these applications require coated carbide (T9115/T9125) or uncoated carbide (TH10) instead.
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 VN 35° inserts?
VN 35° inserts (IC 9.525 mm) fit standard 16 mm negative-rake tool holders. Common holders include Tungaloy MVJNR/L, DVVNN, and external turning holders from Mitsubishi (MVPNR/L), Sandvik (DVVNN), and Korloy. The 35° point angle on the insert requires a matching 35° seat on the tool holder. Browse our turning tool holder catalog for compatible options or contact us for holder recommendations.
Can VN inserts be used for both profiling and facing?
Yes — VN 35° diamond inserts work well for both profiling (axial-direction forming of contours) and facing (radial-direction surfacing). The narrow point angle provides low radial forces on facing operations, making VN an excellent choice for thin-section facing where wider geometries might cause chatter. For pure heavy roughing, however, we recommend switching to TN 60° or CN 80° geometry with stronger edge support.
Need Help Selecting the Right VN Insert?
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Related Tungaloy & Mitsubishi Negative Insert Catalogs
Tungaloy DN 55° Diamond Negative
The wider 55° diamond alternative for profiling with stronger edge. DNMG / DNMA — pairs with VN for complex profiling.
Tungaloy SN 90° Square Negative
The 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 VB/VC 35° Diamond Positive
The positive-rake equivalent of VN — lower cutting forces, ideal for Swiss-type and small lathes.
Mitsubishi CNMG / DNMG / VNMG / WNMG Negative
The Mitsubishi cross-brand equivalent — full negative turning family with US7020/UE6020/MC7020 grades.
Turning Tool Holders — MVJNR / DVVNN
External turning tool holders compatible with VN 35° negative inserts. 16 mm and 22 mm seat sizes stocked.
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.