Tungaloy JTGR3275F J740 Grooving Insert
High-Precision 2.75mm External Grooving | PVD J740 Carbide | Made in Japan
What is the most reliable 2.75mm insert for grooving tough alloys?
The Tungaloy JTGR3275F J740 is a high-performance indexable grooving tool specifically engineered for precision external grooving operations. Utilizing the industry-leading J740 PVD coated carbide grade, this insert provides exceptional wear resistance and edge toughness when machining difficult materials like 304/316 stainless steel, heat-resistant alloys, and titanium. The 2.75mm cutting width (CW) and F-type chipbreaker (Flat geometry) ensure superior chip evacuation and edge sharpness, which is critical for preventing built-up edge (BUE) in CNC machining. As an authentic Japan-made grooving insert, it is the professional choice for maintaining tight tolerances and superior surface finish Ra in high-demand production environments.
Decoding the JTGR3275F Technical Nomenclature
J
Mounting
T
External
G
Grooving
R
Right Hand
3275
2.75mm Width
F
Fine/Flat
J740
PVD Grade
Technical Specs: Metric vs. Imperial Units
| ISO Parameter |
Metric Unit |
Imperial Designation |
| Cutting Width (CW) |
2.75 mm |
0.1083 inch |
| Corner Radius (RE) |
0.20 mm |
0.0078 inch |
| Model Number |
JTGR3275F |
JTGR 3.108F |
| Seat Size |
3 |
Series 3 |
Recommended Cutting Parameters (J740 Grade)
-
Cutting Speed (Vc): 40 - 140 m/min (Material dependent)
-
Feed Rate (f): 0.03 - 0.14 mm/rev (Optimized for 2.75mm width)
-
Coolant: High-pressure coolant recommended for chip control.
*Pro Tip: For 2.75mm slots, verify center height to prevent deflection. J740 provides high toughness for interrupted grooving cycles.*
Global Verified Customer Reviews
⭐⭐⭐⭐⭐ "Standard for 2.75mm Snap Ring Grooves" - Matthias W., Germany
"The JTGR3275F J740 is our absolute standard for hydraulic components. Consistent tool life and very stable width."
⭐⭐⭐⭐⭐ "Perfect for Stainless 316" - J. Rossi, Italy
"Handles 304 and 316 stainless steel with ease. No smearing on the material, just clean and shiny grooves. PVD coating is top tier."
⭐⭐⭐⭐ "Great for Aerospace" - David L., USA
"Used on Swiss machines for Inconel parts. The J740 grade handles heat much better than other brands I have used in the past."
⭐⭐⭐⭐⭐ "Authentic Quality" - T. Nguyen, Vietnam
"Authentic Tungaloy quality. Maintains precision even after long shifts. Highly recommended for CNC production line."
⭐⭐⭐⭐⭐ "Reliable Performance" - S. Clarke, UK
"Fast shipping and genuine product. The F breaker geometry is perfect for maintaining low cutting forces."
Technical Tooling Q&A
Q: Is JTGR3275F suitable for parting-off?
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 grooves.
Q: Which tool holder do I need for this 2.75mm insert?
A: It is designed for Tungaloy J-Series external holders, such as the JCTEL/R series. Match the seat size for Series 3 inserts.
Q: Why use 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 heavy CVD turning.
Expert Insight: PVD Coating Advantage
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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