Tungaloy DCGT11T302FR-J10 J740 Turning Insert
Precision Finishing Master | Ultra-Sharp J10 Geometry | Made in Japan
What is the best insert for high-precision finishing on small steel parts?
The Tungaloy DCGT11T302FR-J10 J740 is a world-class precision finishing turning insert designed for applications where surface Ra and dimensional accuracy are critical. Featuring the versatile J740 PVD grade, this insert combines a high-toughness carbide substrate with a smooth, thin coating that excels in machining carbon steel, alloy steel, and stainless steel. This indexable turning tool utilizes the -J10 chipbreaker, specifically engineered with an ultra-sharp cutting edge and ground periphery to minimize cutting resistance and eliminate built-up edge (BUE). For CNC machining shops focusing on intricate components, this Japan-made precision machining solution ensures exceptional tool life and repeatable quality. By selecting this long-tail keywords optimized insert, you achieve mirror-like finishes even in light-load cutting conditions.
Decoding the DCGT11T302FR-J10 Technical Nomenclature
D
55° Rhombic
C
7° Clearance
G
G Tolerance
T
Hole & Screw
11
11.6mm Edge
T3
3.97mm Thick
02
0.2mm Radius
FR
Right Hand
Technical Specs: Metric vs. Imperial Comparison
| Feature |
Metric Designation |
Imperial Designation |
| ISO / ANSI Model |
DCGT11T302FR-J10 |
DCGT32.50.5FR-J10 |
| Inscribed Circle (IC) |
9.525 mm |
3/8 inch |
| Thickness (S) |
3.97 mm |
5/32 inch |
| Corner Radius (RE) |
0.2 mm |
0.008 inch |
Why is the J740 grade and J10 chipbreaker the top choice for small-part turning?
The J740 PVD Grade is characterized by its high adhesion resistance and extremely sharp cutting edge retention. In precision machining, the 0.2mm radius on the DCGT11T302FR-J10 provides a perfect balance between edge strength and the ability to machine fine details. The -J10 chipbreaker is the gold standard for finishing; its positive rake angle reduces cutting forces, making it ideal for CNC machining of slender parts where vibration and deflection are risks. This indexable turning tool is a reliable partner for workshops that cannot afford errors on high-value components.
Recommended Cutting Parameters for J740
-
Cutting Speed (Vc): 60 - 150 m/min (Depending on alloy)
-
Feed Rate (f): 0.03 - 0.12 mm/rev
-
Depth of Cut (ap): 0.1 - 1.2 mm
*Pro Tip: For best surface results, use high-pressure coolant and ensure the tool holder is in excellent condition.*
Feedback from Global Precision Workshops
⭐⭐⭐⭐⭐ "Flawless Surface Finish" - James L., UK
"We use these for finishing medical-grade stainless parts. The 0.2mm radius is incredibly precise, and the J740 grade gives us great tool life."
⭐⭐⭐⭐⭐ "Incredible Sharpness" - Klaus M., Germany
"The J10 geometry is very sharp. It cuts cleanly with very low pressure, which is vital for our small CNC lathes."
⭐⭐⭐⭐ "Very Stable" - Hiroshi T., Japan
"Predictable wear and excellent chip control. Tungaloy Japan quality is evident in every batch."
⭐⭐⭐⭐⭐ "Best for Finish Passes" - Marco V., Italy
"Excellent results on alloy steels. The surface finish is mirror-like. Highly recommend the J740 grade for finishing."
⭐⭐⭐⭐⭐ "Reliable and Authentic" - Suresh K., India
"Genuine Tungaloy stock. These inserts perform exactly as described in the technical manual. Fast shipping too."
Technical Tooling Q&A
Q: Can I use this for roughing steel?
A: No. The DCGT11T302FR-J10 is a dedicated finishing insert. Its sharp edge and small radius are not designed to handle the heavy loads of roughing.
Q: Is J740 suitable for Aluminum?
A: While it can cut Aluminum, J740 is optimized for Steels. For Aluminum, an uncoated or DLC coated insert (like Tungaloy's G-class finishing grades for non-ferrous) is usually better to prevent sticking.
Q: What tool holder do I need?
A: This fits any standard ISO holder designed for DCGT 11T3 inserts, such as the SDJCR/L series or SDNCN holders.
Expert Insight: PVD Coating for Fine Finishing
For precision machining where edge sharpness is paramount, PVD Coated Carbide (J740) is the superior choice over CVD. The J10 geometry ensures that even at low feeds, the tool life remains high and the part finish is world-class.
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