Tungaloy JTGR3300F J740 Grooving Insert
High-Precision 3.0mm External Grooving | PVD J740 Carbide | Made in Japan
What is the best 3.0mm insert for stable grooving in stainless steel?
The Tungaloy JTGR3300F J740 is a versatile indexable grooving tool optimized for standard 3.0mm external grooving applications. Featuring the high-toughness J740 PVD coated carbide grade, this insert is the primary choice for machining 300-series stainless steels, titanium, and cobalt-chrome alloys. The 3.0mm cutting width (CW) coupled with the F-type chipbreaker (Flat geometry) provides superior edge sharpness and vibration resistance. This is critical for preventing built-up edge (BUE) and maintaining dimensional stability in CNC machining. As a genuine Japan-made grooving insert, it ensures high tool life and an exceptional surface finish Ra.
Decoding the JTGR3300F Technical Nomenclature
J
Mounting
T
External
G
Grooving
R
Right Hand
3300
3.0mm Width
F
Flat Geometry
J740
PVD Grade
Technical Specs: Metric vs. Imperial Units
| ISO Parameter |
Metric Unit |
Imperial Designation |
| Cutting Width (CW) |
3.00 mm |
0.1181 inch |
| Corner Radius (RE) |
0.20 mm |
0.0078 inch |
| Model Number |
JTGR3300F |
JTGR 3.118F |
| Seat Size |
3 |
Series 3 |
Recommended Cutting Parameters (J740 Grade)
-
Cutting Speed (Vc): 45 - 150 m/min (Depending on alloy group)
-
Feed Rate (f): 0.04 - 0.15 mm/rev (Stable for 3.0mm width)
-
Coolant: High-pressure coolant is ideal for deep grooving.
*Pro Tip: Ensure the tool holder shank is as short as possible to maximize rigidity for 3.0mm operations. J740 grade excels in preventing edge chipping.*
Global Verified Customer Reviews
⭐⭐⭐⭐⭐ "Reliable 3.0mm Performance" - Lars M., Germany
"The JTGR3300F is my go-to for standard grooving. The J740 grade holds up incredibly well against heat."
⭐⭐⭐⭐⭐ "Excellent Surface Finish" - Giorgio P., Italy
"Very clean grooves on stainless 304. No vibration even at high speeds. Tungaloy Japan quality is obvious."
⭐⭐⭐⭐ "Great Chip Management" - Robert T., USA
"The F geometry breaks the chips perfectly in our CNC lathes. Reduced our downtime significantly."
⭐⭐⭐⭐⭐ "Long Tool Life" - Nguyen V., Vietnam
"We get 30% more parts per edge compared to our previous brand. J740 is very tough for mass production."
⭐⭐⭐⭐⭐ "Authentic Product" - David S., Australia
"Shipped fast. Genuine Tungaloy. The 3.0mm width is held with high precision across the entire box."
Technical Tooling Q&A
Q: Can I use JTGR3300F for parting-off 20mm bars?
A: It is primarily designed for external grooving. While it can handle light parting, for dedicated high-speed parting, Tungaloy's dedicated parting series is recommended.
Q: Which tool holder is compatible with this insert?
A: Use the JCTEL/R external holder series. Always ensure the seat size matches the Series 3 designation of the insert.
Q: Why choose PVD J740 over CVD grades?
A: PVD coatings like J740 are thinner and sharper, providing higher resistance to edge build-up and chipping during precision grooving compared to thicker CVD coatings.
Expert Insight: Precision Grooving Logic
In precision machining, J740 grade acts as a universal problem-solver for stainless steel. While CVD coatings favor heat resistance in heavy turning, J740 provides the sharp edge stability required for the 3.0mm CNC grooving cycles. Always prioritize rigidity.
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