Tungaloy YN & YW 25° Rhombic Negative Inserts
Ultra-Slim 25° Geometry | Maximum Clearance Profiling | 4-Edge Economy
Which insert is the most effective for extremely narrow undercuts and precision profiling?
The Tungaloy YN and YW Series are engineered for "Impossible" profiling tasks. When even a 35° VNMG insert causes interference, the 25° Rhombic geometry provides the necessary clearance for deep recesses and sharp angles. These negative inserts (YNMG) offer 4 usable cutting edges, delivering significant cost savings over positive alternatives. Featuring Tungaloy's PremiumTec CVD and PVD coatings, these inserts excel in maintaining sharp edge integrity. The -ZF (Finishing) chipbreaker is specifically designed to handle the low depths of cut typical in intricate aerospace and automotive profiling, ensuring excellent surface finishes and zero chip bird-nesting.
Decoding Tungaloy YN/YW Series ISO Codes
Y
25° Rhombic
N / W
Negative 0°
M
Tolerance
G / T
Fixing Type
16
Size (mm)
04
Thickness
04 / 08
Radius
Unmatched Clearance
The narrowest standard diamond geometry available, allowing for machining of steep angles and deep grooves without holder collision.
Negative Strength
Despite the slim profile, the negative design provides a robust cutting edge and 4 usable corners for maximum economic output.
Precision Finisher
Optimized for light profiling and finishing passes where dimensional stability and surface aesthetics are critical.
ISO vs. ANSI Dimensional Reference
| ISO Model |
ANSI Model |
I.C. (Inches) |
Thickness (mm) |
| YNMG 160404-ZF |
YNMG 331-ZF |
3/8" (9.525) |
4.76 mm |
| YNMG 160408-ZM |
YNMG 332-ZM |
3/8" (9.525) |
4.76 mm |
| YWMT 160408-ZM |
YWMT 332-ZM |
3/8" (9.525) |
4.76 mm |
Industrial Profiling Parameters
| Precision Steel (T9215) |
Vc: 150 - 350 m/min | f: 0.08 - 0.25 mm/rev |
| Stainless / Superalloys (AH725) |
Vc: 80 - 180 m/min | f: 0.05 - 0.20 mm/rev |
Specialized Tool Holders
Designed for SYJNR/L and Specialized Y-Series Profiling Bars
View 25° Compatible Tooling
Specialized Applications
- Complex turbine blade and impeller profiling.
- Machining deep V-shaped locking grooves.
- Intricate decorative turning on high-value components.
- Precision profiling of automotive camshaft features.
Machine Compatibility
Ideally suited for high-precision Swiss-type CNCs, multi-axis turn-mill centers, and specialized aerospace machining lathes. Works with Star, Citizen, and Haas equipment.
Tungaloy YN/YW Grade Intelligence
| Grade |
Technology |
Machining Focus |
| T9215 |
CVD |
High-speed steel turning. Maximum crater wear resistance. |
| AH725 |
PVD |
Tough grade for Stainless and Heat-Resistant Superalloys (HRSA). |
| NS530 |
Cermet |
Ultra-mirror finish in steel profiling. High chemical stability. |
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Global Industry Reports
⭐⭐⭐⭐⭐ "Solved Interference Issues" - Daniel H., USA
"We had a groove that even a 35-degree wouldn't hit. The 25-degree YNMG from Tungaloy worked perfectly. Edge life is surprisingly good for such a slim tip."
⭐⭐⭐⭐⭐ "Precision Finish" - Yuki T., Japan
"The cermet grade NS530 in YNMG format gave us the mirror finish our client required on medical components. Very satisfied."
⭐⭐⭐⭐⭐ "Great B2B Partner" - Luca B., Italy
"BEYOND CNC is reliable. They understand industrial requirements and their technical director assisted us with feed rate optimization."
Technical FAQ
Q: What is the primary difference between YN and YW?
A: YN follows a traditional rhombic setup, while YW often denotes variations in relief angles or specific clamping features (such as YWMT). YNMG is the most common negative profiling choice for 4-edge economy.
Q: Can I use high feed rates with 25° inserts?
A: No. Due to the narrow included angle, the tip is more susceptible to thermal stress. Keep feeds conservative (0.05-0.20mm/rev) to maximize tip life.
Tech Tip: Vibration Control
Because **YN/YW inserts** have a very slim geometry, ensure your tool holder has minimum overhang. For internal profiling, use carbide boring bars to suppress harmonics. **BEYOND CNC** - Excellence in Industrial Tooling.
© Technical Document by Beyond Li - CNC Tooling Technical Director
