Tungaloy JTGR3140F J740 Grooving Insert
High-Precision 1.4mm External Grooving | PVD J740 Carbide | Made in Japan
What is the best 1.4mm insert for precision grooving in difficult alloys?
The Tungaloy JTGR3140F 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 1.4mm 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 JTGR3140F Technical Nomenclature
J
Mounting
T
External
G
Grooving
R
Right Hand
3140
1.4mm Width
F
Fine/Flat
J740
PVD Grade
Technical Specs: Metric vs. Imperial Units
| ISO Parameter |
Metric Unit |
Imperial Designation |
| Cutting Width (CW) |
1.40 mm |
0.0551 inch |
| Corner Radius (RE) |
0.10 mm |
0.0039 inch |
| Model Number |
JTGR3140F |
JTGR 3.055F |
| 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 1.4mm narrow slots.
*Pro Tip: For 1.40mm 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
⭐⭐⭐⭐⭐ "Reliable for 1.4mm Slots" - Matthias S., Germany
"The JTGR3140F J740 is our go-to for hydraulic components. Very stable 1.4mm width and excellent tool life on stainless steel."
⭐⭐⭐⭐⭐ "Japan Quality Indeed" - T. Nguyen, Vietnam
"Consistent results every box. These Tungaloy inserts maintain a sharp edge much longer than generic alternatives."
⭐⭐⭐⭐ "Great for Swiss Lathes" - Chris D., USA
"Used on Citizen machines for aerospace fasteners. The 1.4mm groove is clean and the chips are well-managed."
⭐⭐⭐⭐⭐ "Top Grade for Stainless" - Alessandro B., Italy
"J740 grade doesn't smear the material. Perfect for the medical grade 316 we process daily."
⭐⭐⭐⭐⭐ "Genuine & Fast" - A. Clarke, UK
"Always receive authentic Tungaloy parts. Best price-to-performance ratio for precision grooving."
Technical Tooling Q&A
Q: Is JTGR3140F 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 1.4mm 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 use J740 over CVD grades?
A: J740 (PVD) provides higher edge sharpness and toughness, making it far superior for vibration-sensitive precision grooving than thicker CVD coatings.
Expert Insight: PVD vs. CVD in 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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