Tungaloy JTGR3225F J740 Grooving Insert
High-Precision 2.25mm External Grooving | PVD J740 Carbide | Made in Japan
What is the best 2.25mm insert for narrow grooving in titanium?
The Tungaloy JTGR3225F J740 is a high-performance indexable grooving tool designed for ultra-accurate external grooving. Built with the premium J740 PVD coated carbide grade, this insert is specifically optimized for machining difficult-to-cut materials like 304/316 stainless steel, heat-resistant superalloys, and titanium. The 2.25mm cutting width (CW) combined with the F-type chipbreaker ensures high edge sharpness and excellent chip control, which is essential for preventing built-up edge (BUE) in precision CNC machining. As an authentic Japan-made grooving insert, it provides the reliability needed for maintaining tight tolerances and a superior surface finish Ra.
Decoding the JTGR3225F Technical Nomenclature
J
Mounting
T
External
G
Grooving
R
Right Hand
3225
2.25mm Width
F
Flat/Fine
J740
PVD Grade
Technical Specs: Metric vs. Imperial Units
| ISO Parameter |
Metric Unit |
Imperial Designation |
| Cutting Width (CW) |
2.25 mm |
0.0886 inch |
| Corner Radius (RE) |
0.20 mm |
0.0078 inch |
| Model Number |
JTGR3225F |
JTGR 3.089F |
| Seat Size |
3 |
Series 3 |
Recommended Cutting Parameters (J740 Grade)
-
Cutting Speed (Vc): 40 - 140 m/min (Highly dependent on workpiece material)
-
Feed Rate (f): 0.03 - 0.12 mm/rev (Optimize for 2.25mm stability)
-
Coolant: High-pressure flood coolant is highly recommended.
*Pro Tip: For 2.25mm precision grooving, verify tool center height exactly to prevent rubbing and ensure superior surface Ra. J740 provides high toughness for interrupted grooving cycles.*
Global Verified Customer Reviews
⭐⭐⭐⭐⭐ "Predictable and Tough" - Matthias S., Germany
"The JTGR3225F J740 is our standard for 2.25mm grooves in aerospace components. Very predictable tool life even in Inconel."
⭐⭐⭐⭐⭐ "No Smearing on 316L" - Alessandro B., Italy
"Handles stainless steel beautifully. The F-breaker keeps the cut clean and the surface finish is excellent."
⭐⭐⭐⭐ "Great for Swiss Lathes" - Kevin M., USA
"The precision of these Tungaloy inserts is unmatched. We use them for small medical parts with high success rates."
⭐⭐⭐⭐⭐ "Genuine Quality" - S. Tanaka, Japan
"Very stable performance. J740 grade is perfect for balancing hardness and toughness in CNC production."
⭐⭐⭐⭐⭐ "Highly Recommended" - James P., UK
"Fast shipping and authentic parts. The 2.25mm width is exactly what we needed for specific hydraulic grooves."
Technical Tooling Q&A
Q: Is JTGR3225F suitable for high-speed parting?
A: This is specifically an external grooving insert. While it can perform light parting-off on small diameters, its flat geometry (F) is best optimized for precision 2.25mm grooves.
Q: Which tool holder do I need for this 2.25mm insert?
A: It is designed for Tungaloy J-Series external holders, such as the JCTEL/R series. Always match the seat size for Series 3 inserts.
Q: Why choose J740 over CVD grades for grooving?
A: J740 (PVD) provides a sharper cutting edge and higher toughness, which is critical for narrow grooving where vibration is more likely than in heavy CVD turning.
Expert Insight: PVD vs. CVD in Precision Grooving
In precision machining, J740 represents the peak of edge toughness. While CVD coatings are optimized for high-volume steel roughing, J740 provides the sharp stability needed for the narrow slotting cycles of CNC grooving. Protect your indexable grooving tool with filtered coolant.
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