Tungaloy EPGT040102L-J08 J740 Coated Carbide Turning Insert for Precision Boring

$144.05 USD

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Description

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.

© Technical Content by cnchome-beyond.com - Japan Tooling Excellence

Technical FAQ & Buying Guide

Are your carbide inserts interchangeable with major brands like Sandvik, Iscar, or Kennametal?

Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.

How do I choose the correct insert grade and chipbreaker for machining Stainless Steel (M) vs. Carbon Steel (P)?

We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:

  • For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
  • For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
What are the recommended cutting speed (Vc) and feed rate (f) parameters to maximize tool life?

The optimal cutting parameters vary depending on the workpiece hardness and operation type:

  • For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
  • For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Do you offer bulk discounts or wholesale pricing for machine shops and distributors?

Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.

What is your international shipping policy and typical lead time for orders?

We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.

How do you guarantee the quality and tolerance precision of your CNC tools?

All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.