Tungaloy EPGT040102L-W08 GH110 Boring Insert
High-Precision PVD Coated Carbide | Industrial GH110 Grade | Made in Japan
What is the most durable insert for small diameter precision boring?
The Tungaloy EPGT040102L-W08 GH110 is a specialized indexable boring tool designed for high-precision internal finishing. Unlike standard cermet, the GH110 PVD coated carbide grade offers exceptional toughness and thermal stability, making it ideal for consistent performance in alloy steels, stainless steel, and cast iron. The -W08 chipbreaker is a dedicated finishing geometry, providing sharp cutting action and efficient chip evacuation even at extremely light depths of cut. This Left-Hand (L) insert is a staple in CNC machining environments where dimensional accuracy and tool life are the highest priorities. Integrating this long-tail keywords optimized insert into your workflow ensures high-speed efficiency and reduced machine downtime.
Decoding the EPGT040102L-W08 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
-W08
Finishing
Technical Specs: Metric vs. Imperial Comparison
| ISO Parameter |
Metric Unit |
Imperial Designation |
| ISO Model Name |
EPGT040102L-W08 |
EPGT1.510.5L-W08 |
| 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 (GH110)
-
Cutting Speed (Vc): 80 - 180 m/min (Standard Precision Range)
-
Feed Rate (f): 0.03 - 0.12 mm/rev
-
Depth of Cut (ap): 0.05 - 0.7 mm
*Pro Tip: GH110 is a high-toughness grade. If you encounter slight chatter, reduce your cutting speed and ensure your boring bar overhang is as short as possible.*
Feedback from Global Machinists
⭐⭐⭐⭐⭐ "Tougher than Cermet" - Mark T., USA
"Switched to GH110 for our small boring ops on 304 stainless. The edge holds up much better against the work hardening than cermet did. Great product."
⭐⭐⭐⭐⭐ "Perfect for Precision Valves" - K. Schmidt, Germany
"Very sharp and holds tolerance over hundreds of parts. The Left-hand orientation is exactly what we needed for our specific Swiss-turn setup."
⭐⭐⭐⭐ "Consistent Tool Life" - Hiroshi S., Japan
"Tungaloy GH110 is my go-to for alloy steel internal work. The -W08 chipbreaker keeps the chips short and prevents scratching. Original Japan stock."
⭐⭐⭐⭐⭐ "Reliable for Cast Iron" - M. Conti, Italy
"Used this on grey cast iron and the wear was extremely uniform. Excellent Ra values on the finish pass."
⭐⭐⭐⭐⭐ "Fast Delivery & High Quality" - A. Clarke, UK
"Hard to find original EPGT in GH110 locally. These are authentic Tungaloy and perform significantly better than generic alternatives."
Technical Tooling Q&A
Q: Can GH110 handle interrupted cuts?
A: GH110 is a tough, PVD coated carbide grade. It handles light interruptions much better than cermet, though high-speed continuous boring is still where it excels most.
Q: Is this insert suitable for non-ferrous materials?
A: GH110 is optimized for steels and cast iron. For aluminum or copper, an uncoated, high-polish grade (like KS05F) would be more appropriate to prevent adhesion.
Q: Why is Left-Hand (L) necessary?
A: Orientation is critical for internal boring. Ensure your boring bar and spindle rotation direction match the Left-hand geometry of this insert.
Expert Insight: PVD Coated Carbide GH110
In precision machining, GH110 Carbide provides the balance between toughness and precision. While NS9530 Cermet offers higher gloss, GH110 is the workhorse for difficult-to-cut materials and applications requiring absolute edge stability. Protect your indexable turning tool by following recommended feed rates.
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