Tungaloy EPGT040102L-J08 J740 Boring Insert
High-Performance PVD Coated J740 | Stainless Steel Specialist | Made in Japan
What is the most stable insert for boring small holes in stainless steel?
The Tungaloy EPGT040102L-J08 J740 is a high-precision indexable boring tool specifically engineered for difficult-to-machine materials. Featuring the J740 PVD coated carbide grade, this insert offers extreme toughness and wear resistance, particularly when facing the work-hardening tendencies of stainless steels and superalloys. The -J08 chipbreaker is designed for light depths of cut, providing sharp cutting action and superior chip control in internal applications. As a premium CNC machining component from Japan, this Left-Hand (L) insert ensures incredible dimensional accuracy. Integrating this long-tail keywords optimized solution into your production provides longer tool life and reduces the risk of edge chipping in demanding cycles.
Decoding the EPGT040102L-J08 Technical Nomenclature
E
75° Rhombic
P
11° Relief
G
G-Tolerance
T
Screw Lock
04
4.7mm Edge
01
1.2mm Thick
02L
0.2mm Left
-J08
Finishing
Technical Specs: Metric vs. Imperial Comparison
| ISO Parameter |
Metric Unit |
Imperial Designation |
| ISO Model Name |
EPGT040102L-J08 |
EPGT1.510.5L-J08 |
| Inscribed Circle (IC) |
4.76 mm |
3/16 inch |
| Thickness (S) |
1.2 mm |
0.047 inch |
| Corner Radius (RE) |
0.2 mm |
0.008 inch |
Recommended Cutting Parameters (J740)
-
Cutting Speed (Vc): 40 - 120 m/min (Highly Dependent on Material)
-
Feed Rate (f): 0.03 - 0.10 mm/rev
-
Depth of Cut (ap): 0.05 - 0.5 mm
*Pro Tip: J740 is excellent for gummy materials like low-carbon steel and stainless. Always use coolant for internal boring to assist chip removal.*
Feedback from Global Machinists
⭐⭐⭐⭐⭐ "Stainless Steel Savior" - G. Weber, Germany
"J740 grade is perfect for our 316L parts. We were getting edge chipping with other brands, but these Tungaloy inserts are much tougher."
⭐⭐⭐⭐⭐ "Great for Medical Parts" - D. Miller, USA
"The 0.2mm radius allows us to hit tight corners on surgical components. Very stable tool life and great precision. Japan-made quality at its best."
⭐⭐⭐⭐ "Smooth Cutting" - Hiroshi K., Japan
"Sharp edge and great chip control with the J08 breaker. Holds size over long production runs. Very satisfied."
⭐⭐⭐⭐⭐ "High Accuracy Boring" - Luca M., Italy
"G-Tolerance is essential for our high-precision valve seats. These inserts are consistent part after part."
⭐⭐⭐⭐⭐ "Excellent Value" - S. Clarke, UK
"Reliable performance in heat-resistant alloys. Original packaging and fast shipping. Highly recommended."
Technical Tooling Q&A
Q: Why choose J740 over GH110?
A: J740 is specifically designed for stainless steel and superalloys. It offers higher resistance to the high temperatures and work-hardening characteristic of those materials compared to general-purpose grades.
Q: What is the benefit of the EPGT geometry?
A: The 75-degree rhombic shape combined with a positive relief angle allows for minimal cutting forces, which is crucial for small-diameter boring to prevent deflection and chatter.
Q: Is this insert compatible with standard boring bars?
A: Yes, it fits standard ISO holders for EPGT04 inserts. However, ensure you have a Left-Hand (L) holder for this Left-Hand insert.
Expert Insight: PVD Coated J740 Grade
In precision machining, J740 Carbide is the ultimate specialist for tough materials. While NS9530 Cermet offers higher gloss in steels, J740 provides the physical integrity needed for high-pressure finishing in aerospace and medical stainless. Protect your indexable turning tool by using proper filtration in your coolant.
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