Tungaloy DCGT070202FR-J10 J740 Turning Insert
Precision Finishing Expert | Ultra-Sharp J10 Geometry | Made in Japan
What is the best carbide insert for precision finishing on small parts?
The Tungaloy DCGT070202FR-J10 J740 is a premium, high-accuracy PVD coated carbide turning insert specifically engineered for fine finishing operations. Utilizing the J740 grade, which combines a tough carbide substrate with a specialized PVD coating, this insert excels in machining steel, stainless steel, and heat-resistant alloys. This indexable turning tool features the highly acclaimed -J10 chipbreaker, known for its ultra-sharp cutting edge and ground-periphery accuracy, which minimizes cutting forces and prevents built-up edge. Whether you are performing CNC machining on Swiss-type lathes or small-part turning, this Japan-made precision machining tool delivers an mirror-like surface finish and exceptional tool life. By integrating this long-tail keywords optimized insert into your workflow, you guarantee dimensional stability for your most critical components.
Decoding the DCGT070202FR-J10 Technical Nomenclature
D
55° Rhombic
C
7° Clearance
G
G Tolerance
T
Hole & Screw
07
7mm Edge
02
2.38mm Thick
02
0.2mm Radius
FR
Right Hand
Technical Specs: Metric vs. Imperial Comparison
| Feature Detail |
Metric Designation |
Imperial Equiv. |
| ISO / ANSI Model |
DCGT070202FR-J10 |
DCGT21.50.5FR-J10 |
| Inscribed Circle (IC) |
6.35 mm |
1/4 inch |
| Corner Radius (RE) |
0.2 mm |
0.008 inch |
Why is the J740 grade and J10 chipbreaker the top choice for finish turning?
The J740 PVD Grade is characterized by its high adhesion resistance and smooth coating surface, which is essential for maintaining tight tolerances and preventing work-hardening of the material. The -J10 chipbreaker is specifically designed for finishing and light-duty cutting. Its positive rake angle and sharp cutting edge allow for low-vibration machining even on slender workpieces. In precision machining, this indexable turning tool minimizes heat generation, ensuring the physical properties of the workpiece remain intact. For CNC machining shops focusing on medical, aerospace, or electronic components, the DCGT070202FR-J10 provides the reliable accuracy needed for high-quality production.
Recommended Cutting Parameters for J740
-
Cutting Speed (Vc): 50 - 150 m/min
-
Feed Rate (f): 0.03 - 0.12 mm/rev
-
Depth of Cut (ap): 0.1 - 1.0 mm
*Pro Tip: Use a high-quality tool holder with minimal runout to fully leverage the G-tolerance precision of this insert.*
Feedback from Global Precision Workshops
⭐⭐⭐⭐⭐ "Perfect for Swiss Turning" - Sarah M., Switzerland
"We use these for finishing tiny stainless shafts. The surface finish is consistently under 0.8 Ra. The J740 grade doesn't chip on the fine radius."
⭐⭐⭐⭐⭐ "Incredible Sharpness" - Tom H., USA
"The J10 geometry is so sharp it cuts through alloy steel with almost zero pressure. Great for preventing deflection on long parts."
⭐⭐⭐⭐ "Very Reliable" - Guillaume D., France
"Very predictable tool life. We run these on our Citizen lathes and rarely have to adjust offsets between shifts."
⭐⭐⭐⭐⭐ "Best for Finishing" - Akira S., Japan
"High precision G-class tolerance. For precision finishing of small components, Tungaloy J740 is my first choice."
⭐⭐⭐⭐⭐ "Authentic Quality" - Liam N., Australia
"Original Tungaloy inserts delivered on time. The performance on alloy steel is exactly what we expected from a Japanese tool."
Technical Precision Q&A
Q: What materials can the J740 grade handle?
A: J740 is a versatile PVD grade. It is excellent for Steel (P), Stainless Steel (M), and Heat Resistant Alloys (S) in finishing applications.
Q: Why is the FR suffix important?
A: "FR" indicates a right-hand, front-cutting orientation. Ensure your tool holder matches this orientation for proper chip flow and geometry engagement.
Q: How does the 0.2mm radius affect machining?
A: A small radius (0.2mm) allows for extremely fine detail and sharp corners. It also reduces cutting pressure, which is vital for thin-walled or slender workpieces.
Expert Insight: PVD Coating for Fine Finishing
For precision machining where surface Ra is critical, PVD Coated Carbide (J740) provides the sharpest edge and best finish. The J10 geometry ensures that even at low feed rates, the chip is controlled and the part quality remains world-class.
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