Mitsubishi VBMT110308-MV VP15TF Carbide Turning Inserts | VBMT 2.21.5
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Which carbide turning insert is best suited for medium-cut profiling on stainless steel and alloy steel with intermittent cuts?
The Mitsubishi VBMT110308-MV VP15TF (ANSI Model designation: VBMT 2.21.5-MV) is an industrial-grade indexable turning insert engineered for precision profiling, copying, and finishing operations on lathes and CNC turning centers.
Featuring Mitsubishi's proprietary VP15TF PVD Miracle Coating (Titanium Aluminum Nitride multi-layer over a micro-grain carbide substrate), this insert suppresses crater wear, notch wear, and thermal cracking under high-heat cutting environments. The 3D MV Chipbreaker controls chip curl across medium feeds (0.10 - 0.25 mm/rev), eliminating chip entanglement on tough materials such as AISI 304, AISI 316, 4140, and alloy steels.
| Engineering Feature | Technical Mechanism & Operator Benefit |
|---|---|
| VP15TF PVD Miracle Coating | High-hardness TiAlN PVD barrier layer with extreme oxidation resistance up to 800°C. Prevents micro-chipping during semi-interrupted cuts. |
| MV Medium-Cut Geometry | Optimum dual-angle rake face reduces cutting forces while tightly curling ductile stainless steel chips for reliable automated chip removal. |
| 5° Positive Clearance Angle | Minimizes side wall friction during internal boring, copying, and undercut profiling (Ra < 0.8 µm surface finish capability). |
| Micro-Grain Substrate | Cobalt-enriched carbide core delivers high shock resistance, preventing sudden catastrophic breakage. |
| V | Insert Shape: 35° Rhombic / Diamond geometry (Maximum profile accessibility). |
| B | Clearance Angle: 5° Positive clearance angle (Low cutting pressure). |
| M | Tolerances: ISO Class M (Inner circle ±0.05mm–0.13mm, thickness ±0.13mm). |
| T | Fixing & Rake: Countersunk mounting hole with 3D single-sided chipbreaker. |
| 11 (2.2) | Cutting Edge Length: Metric 11.0 mm | Imperial 2.2 sixteenths (6.35 mm IC). |
| 03 (1.5) | Insert Thickness: Metric 3.18 mm | Imperial 1.5 sixteenths (1/8" nominal). |
| 08 (.031) | Corner Radius: Metric 0.8 mm corner radius | Imperial 1/32" (.0315 in). |
| MV | Chipbreaker Designation: Medium-Cut Versatile profile for Steel & Stainless Steel. |
| Specification Field | Metric Unit (ISO) | Imperial Unit (ANSI) |
|---|---|---|
| Model Code | VBMT110308-MV | VBMT 2.21.5-MV |
| Inscribed Circle (IC) | 6.35 mm | 0.250 in (1/4") |
| Thickness (S) | 3.18 mm | 0.125 in (1/8") |
| Corner Radius (RE) | 0.80 mm | 0.0315 in (1/32") |
| Cutting Edge Length (L) | 11.0 mm | 0.433 in |
| Hole Diameter (D1) | 2.80 mm | 0.110 in |
| Coating Type | PVD Miracle (TiAlN) | PVD Miracle (TiAlN) |
| Workpiece Material Group | Cutting Speed (Metric) | Cutting Speed (Imperial) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|---|
|
Steel (P10–P25) 1045, 4140, 4340, 8620 |
140 - 240 m/min | 460 - 785 SFM | 0.10 - 0.25 mm/rev (.004 - .010 ipr) |
0.5 - 2.5 mm (.020 - .100 in) |
|
Stainless Steel (M15–M30) 304, 316, 17-4PH, Duplex |
110 - 180 m/min | 360 - 590 SFM | 0.08 - 0.20 mm/rev (.003 - .008 ipr) |
0.5 - 2.0 mm (.020 - .080 in) |
|
Cast Iron (K15–K25) Ductile Iron, Gray Iron |
120 - 210 m/min | 390 - 690 SFM | 0.12 - 0.25 mm/rev (.005 - .010 ipr) |
0.5 - 2.5 mm (.020 - .100 in) |
Compatible CNC Toolholder Systems (ISO Standard)
This VBMT110308 insert matches 107.5° side cutting edge external holders and internal boring bars:
- External Turning Holders: SVJBR 1212H11, SVJBR 1616H11, SVJBR 2020K11, SVJBR 2525M11
- Internal Boring Bars: A12M-SVJBR11, A16R-SVJBR11, A20S-SVJBR11
- Clamping Hardware: M2.5 x 6.0mm Screw (T8 Torx Key)
Primary Machining Operations: External longitudinal turning, contour copying, shoulder turning, face profiling, and high-precision internal boring.
CNC Equipment Compatibility: Fits all standard CNC Lathes, Swiss-type Automatic Lathes, Turning Centers, and Multi-Tasking Mill-Turn machines using screw-clamp SVJBR/L style holders.
| Manufacturer | Equivalent Grade | Equivalent Chipbreaker | Comparative Performance |
|---|---|---|---|
| Mitsubishi (Target) | VP15TF | MV | Baseline: High balance of wear resistance & toughness. |
| Sandvik Coromant | GC2015 / GC1115 | MF / MM | Similar TiAlN PVD coating; VP15TF provides higher anti-chipping toughness. |
| Iscar | IC907 / IC908 | SM / SF | Comparable micro-grain core; VP15TF handles adhesive stainless cut better. |
| Kyocera | PR930 / PR1125 | MQ / MS | High-hardness PVD; VP15TF yields lower notch wear under thermal cycle. |
"Switched to these VP15TF inserts for turning 316L shafts on our Haas ST-20. Reduced insert notch wear by 40% over our previous brand. The MV breaker breaks chips cleanly at 0.18 mm/rev."
"Original Mitsubishi inserts. Outstanding tool life when contouring 42CrMo4 steel. Fast shipping to Stuttgart."
"Eccellente per acciaio inossidabile. Finitura superficiale costante su lotti da 500 pezzi."
"VP15TFは安定性が高い。SUS304の断続削りでも欠けにくく、自動運転で重宝しています。"
| Failure Symptom | Root Cause | Corrective Action |
|---|---|---|
| Built-Up Edge (BUE) | Cutting speed (Vc) too low or insufficient coolant. | Increase cutting speed (Vc) by 15-20%; focus coolant stream directly on cutting zone. |
| Chipping / Micro-fracture | Vibration or severe interrupted cut shock. | Reduce feed rate (fn) by 15%; minimize tool overhang length. |
| Unbroken Bird-nesting Chips | Feed rate (fn) or depth of cut (ap) too low. | Increase feed rate above 0.12 mm/rev to engage MV chipbreaker geometry. |
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.