Tungaloy GE Series Grooving Inserts
Precision Grooving & Parting | GH730, T9125, T9225 Grades | Made in Japan
Which Tungaloy GE insert grade is best for stainless steel grooving?
The Tungaloy GE Series represents a versatile solution for high-precision grooving and parting-off operations. Whether you are using the GE20, GE30, GE40, or GE50 sizes, these indexable grooving tools provide exceptional edge stability and chip control. Available in the GH730 PVD coated grade for stainless steel and heat-resistant alloys, or the T9125 and T9225 CVD grades for high-speed steel machining, this series is engineered for the modern CNC machining environment. By utilizing these long-tail keywords optimized inserts, you ensure high-speed performance, excellent surface Ra, and significantly extended tool life in both external and internal grooving cycles.
Understanding the GE Model Designation
G
Grooving
E
Precision Class
30
3.0mm Width
GH730
Grade Info
Available Models: Metric & Imperial Equivalence
| Model Name |
Insert Width (Metric) |
Imperial Equivalent |
Best Grade For |
| GE20 GH730 |
2.0 mm |
0.079" |
Stainless/Universal |
| GE30 GH730 / T9125 |
3.0 mm |
0.118" |
Stainless / Steel |
| GE40 GH730 / T9125 |
4.0 mm |
0.157" |
Stainless / Steel |
| GE50 GH730 / T9225 |
5.0 mm |
0.197" |
General Steel Finishing |
Recommended Cutting Parameters
-
GH730 (PVD): Vc: 60 - 150 m/min | Feed: 0.05 - 0.15 mm/rev (Best for Stainless)
-
T9125/T9225 (CVD): Vc: 120 - 250 m/min | Feed: 0.08 - 0.20 mm/rev (Best for Carbon Steel)
*Pro Tip: Ensure stable clamping. For deep grooves, use peck-cycle grooving to prevent chip packing and ensure cool-tip performance.*
Global Machinist Reviews
⭐⭐⭐⭐⭐ "GH730 is King for 316L" - Dieter S., Germany
"The GE30 GH730 works beautifully on stainless. The chip control is predictable, and I get a great finish every time."
⭐⭐⭐⭐⭐ "High Speed Steel Grooving" - James W., USA
"T9125 grade allows us to push the speed on 1018 steel. Very long tool life compared to the cheaper alternatives."
⭐⭐⭐⭐ "Very Sharp Edge" - Hiroki L., Japan
"Japan made quality as expected. The precision on the GE20 width is spot on for my tight tolerance parts."
⭐⭐⭐⭐⭐ "Great for Parting Off" - Luca P., Italy
"We use the GE40 for parting 40mm bars. No vibration and clean cuts. Very reliable series."
⭐⭐⭐⭐⭐ "Predictable Wear" - Sarah J., Australia
"Consistent results. T9225 is very tough and handles light interruptions without chipping."
Tooling Expert Q&A
Q: Can I use the same holder for GE20 and GE50?
A: No. Each insert size (20, 30, 40, 50) usually corresponds to a specific pocket size in the tool holder. Always match your insert size to the holder designation (e.g., CGER/L holders).
Q: When should I choose GH730 over T9125?
A: Choose GH730 (PVD) for stainless steel and alloys where toughness and resistance to built-up edge are needed. Choose T9125 (CVD) for high-speed grooving in carbon and alloy steels.
Q: Does the GE series support internal grooving?
A: Yes, with the appropriate internal grooving bar, the GE series performs exceptionally well for ID grooving operations.
Expert Comparison: PVD vs. CVD in Grooving
In precision machining, grade selection is vital. GH730 (PVD) offers a thinner, sharper coating for low-speed/high-toughness apps. T9125/T9225 (CVD) offers a thicker, heat-resistant layer for high-volume steel production. Protect your indexable grooving tool by matching the grade to your workpiece material.
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