Tungaloy JTGR3145F J740 Grooving Insert
High-Precision 1.45mm External Grooving | PVD J740 Carbide | Made in Japan
What is the best 1.45mm insert for precision grooving in difficult alloys?
The Tungaloy JTGR3145F J740 is a premier indexable grooving tool specifically engineered for high-accuracy external grooving. Utilizing the high-performance J740 PVD coated carbide grade, this insert excels in machining tough materials like 304/316 stainless steel, titanium, and heat-resistant superalloys. The 1.45mm cutting width (CW) and F-type chipbreaker provide exceptional edge sharpness and chip evacuation, which is critical for preventing built-up edge (BUE) in precision CNC machining. As an authentic Japan-made long-tail keywords optimized insert, it is the industry standard for maintaining tight tolerances and superior surface finish Ra, ensuring consistent tool life in high-demand production cycles.
Decoding the JTGR3145F Technical Nomenclature
J
Mounting
T
External
G
Grooving
R
Right Hand
3145
1.45mm Width
F
Fine/Flat
J740
PVD Grade
Technical Specs: Metric vs. Imperial Units
| ISO Parameter |
Metric Unit |
Imperial Designation |
| Cutting Width (CW) |
1.45 mm |
0.0571 inch |
| Corner Radius (RE) |
0.10 mm |
0.0039 inch |
| Model Number |
JTGR3145F |
JTGR 3.057F |
| Seat Size |
3 |
Series 3 |
Recommended Cutting Parameters (J740 Grade)
-
Cutting Speed (Vc): 40 - 140 m/min (Depending on material group)
-
Feed Rate (f): 0.02 - 0.09 mm/rev
-
Coolant: High-pressure coolant is highly recommended for 1.45mm narrow slots.
*Pro Tip: For 1.45mm 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
⭐⭐⭐⭐⭐ "Extremely Reliable" - K. Schneider, Germany
"The JTGR3145F J740 is our standard for specific 1.45mm grooves. Predictable tool life and perfect edge toughness on stainless."
⭐⭐⭐⭐⭐ "Quality Made in Japan" - T. Nguyen, Vietnam
"Tungaloy J740 grade doesn't disappoint. Maintains precision even after long shifts on medical grade components."
⭐⭐⭐⭐ "Great for Aerospace" - M. Miller, USA
"Perfect for the shallow grooves we need in titanium alloys. Chips break cleanly with the F-type geometry."
⭐⭐⭐⭐⭐ "Excellent Surface Finish" - Roberto F., Italy
"Used these for final grooving on 316L parts. Zero burrs and very high shine on the groove bottom."
⭐⭐⭐⭐⭐ "Fast Shipping & Genuine" - S. Clarke, UK
"Best price I could find for genuine Tungaloy. The 1.45mm width is exact every single time."
Technical Tooling Q&A
Q: Is JTGR3145F 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 optimized for precision 1.45mm wide grooves.
Q: Which tool holder do I need for this insert?
A: It is designed for Tungaloy J-Series external holders, such as the JCTEL/R series. Please match the seat size for the 3xxx series 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 compared to 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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