Tungaloy EPGT040104L-W08 GH110 PVD Coated Carbide Turning Insert
Tungaloy EPGT040102L-W08 GH110 Coated Carbide Turning Insert for Precision Boring
Tungaloy EPGT040102L-J08 J740 Coated Carbide Turning Insert for Precision Boring
Tungaloy EPGT040104L-W08 NS9530 Cermet Turning Insert for High Precision Boring
Tungaloy EPGT040102L-W08 NS9530 Cermet Turning Insert for Precision Boring
Tungaloy EP 75° Rhombic Inserts — EPGT, EPMT Precision Boring for Small-Diameter Work
5 in-stock 75° rhombic Tungaloy indexable carbide turning inserts covering 1 geometry family (EPGT) and 3 grade families (GH110 PVD / J740 CVD / NS9530 cermet). IC 4.0 mm. Specifically designed for precision small-diameter boring on Swiss-type lathes and CNC turning centers. 2-3 day dispatch from Zhejiang warehouse, DHL/UPS worldwide 3-7 days, all ISO 1832 compliant.
About EP 75° Rhombic Inserts (EP-Style)
The ISO 1832 EP-shape family delivers a 75° rhombic cutting edge with positive clearance — a less common geometry used primarily for precision boring and small-diameter internal profiling. Tungaloy's EP lineup in this collection includes one main geometry variant:
- EPGT (G chip-breaker, T tolerance) — 5 SKUs. Ground-periphery EPGT with chip-breaker on one face. All EPGT in this catalog are left-hand (L) orientation, IC 4.0 mm, nose radius 0.2 / 0.4 mm, with W08 and J08 chip-breaker variants for general and precision boring.
EP inserts are the specialty geometry for small-diameter precision boring on Swiss-type lathes and CNC turning centers. The 75° included angle provides a balanced cutting geometry that distributes forces evenly on small boring bars (typical Ø 4-8 mm). The 4.0 mm IC fits standard Swiss tool block boring pockets. Compared to the more common CC (80°) and DC (55°) boring inserts, EP offers a different lead angle option for specific holder designs.
Tungaloy's EP catalog in this collection focuses on 3 premium grades: GH110 (PVD Al-rich for stainless), J740 (CVD coated for steel), and NS9530 (cermet for mirror surface finishing). All 5 inserts are genuine Japanese Tungaloy product from Iwate, Japan.
EPGT Series — All 5 In-Stock SKUs
Below are all 5 EPGT SKUs from our inventory, organized by grade and chip-breaker. Click through to verify grade specs, IC size, nose radius, and full dimensional drawings.
Browse by Application & Grade
All 5 EPGT SKUs are grouped below by application and grade. Click any category to filter the full catalog.
By Workpiece Material
- Stainless Steel 304/316 — EPGT-W08 GH110 (2 SKUs, PVD Al-rich)
- Carbon Steel / Alloy Steel — EPGT-J08 J740 (1 SKU, CVD coated)
- Mirror Finish on Steel — EPGT-W08 NS9530 (2 SKUs, cermet)
By Chip-Breaker
- W08 (General Boring): 4 SKUs. General-purpose chip-breaker for most boring applications. Used with GH110 and NS9530 grades.
- J08 (Precision Boring): 1 SKU. Sharper chip-breaker for precision boring at low feed rates. Used with J740 grade for steel.
By Carbide Grade
- GH110 (PVD Al-rich) — Tungaloy's premium grade for stainless steel 304/316 and high-temperature alloys. Excellent built-up edge resistance.
- J740 (CVD Coated) — Tungaloy's CVD coated grade for carbon steel and alloy steel boring. General purpose steel machining.
- NS9530 (Cermet) — Tungaloy's premium cermet grade (P05-P15) for mirror surface finishing on steel. Superior surface finish at low cutting speeds.
EP vs CC vs DC — 3-Way Boring Geometry Comparison
Where does the EP 75° rhombic fit among the more common boring insert geometries? This table compares EP against CC (80° positive) and DC (55° positive) for small-diameter precision boring.
| Attribute | EP (75° pos.) | CC (80° pos.) | DC (55° pos.) |
|---|---|---|---|
| Shape | 75° rhombic positive | 80° rhombic positive | 55° rhombic positive |
| Included angle | 75° | 80° | 55° |
| Clearance | Positive (5° / 7°) | Positive (7°) | Positive (7°) |
| Edge strength | ★★★ | ★★★ | ★★ (sharpest) |
| Edge sharpness | ★★★★ | ★★★ | ★★★★★ (sharpest) |
| Best for | Small-Ø precision boring | General boring | Smallest-Ø profiling |
| Max boring depth | ~ 4× bar diameter | ~ 3× bar diameter | ~ 5× bar diameter |
| Typical IC range | 4-6 mm | 6-12 mm | 5-9 mm |
| Common holders | EP-boring bar (EPEG-type) | SCLCR/L boring bar | SDJCR/L boring bar |
| Common workpiece | Stainless, alloy steel, finishing | Steel, stainless, general | Shaft, slender parts |
| Catalog count (Tungaloy) | 5 (this collection) | 15+ (CCGT/CCMT) | 10+ (DCGT/DCMT) |
| Best grade pairing | GH110 (PVD), J740 (CVD), NS9530 (cermet) | NS9530 (cermet), GH110 (PVD) | NS9530 (cermet), GH110 (PVD) |
Bottom line: Pick EPGT for small-diameter precision boring on Swiss-type lathes where the 75° rhombic shape fits the specific tool block design. Tungaloy's EP line is specifically engineered for the boring-bar geometry of Tsugami, Citizen, and Star Swiss lathes. For general boring on a CNC lathe, CC (80°) and DC (55°) are more common choices due to wider availability.
How to Choose the Right EP 75° Rhombic Insert — 3-Step
Step 1 — Identify the Workpiece
- Stainless steel 304/316: EPGT-W08 with GH110 grade (PVD Al-rich).
- Carbon steel / alloy steel: EPGT-J08 with J740 grade (CVD coated, precision boring).
- Mirror finish on steel: EPGT-W08 with NS9530 grade (cermet).
Step 2 — Pick the Nose Radius
- 0.4 mm nose (040104): Standard nose radius for general boring. Better chip control, slightly higher feed rates.
- 0.2 mm nose (040102): Sharper edge for finishing and precision boring. Better surface finish, lower feed rates.
Step 3 — Verify Holder Compatibility
- EP (75° positive): Use Tungaloy EPEG-type boring bar with EP pocket. Common on Swiss-type lathes (Tsugami, Citizen, Star) with EP-pocket tool blocks.
- Verify lead angle: 75° matches EPGT perfectly. Tungaloy's EPEG boring bars come in 4-6 mm bar diameters for EPGT 04 IC.
- Match IC to bar pocket: EPGT 04 needs 4 mm pocket (only size in catalog).
Frequently Asked Questions
Related Tungaloy & Other Brand Inserts
Need a Specific Tungaloy EP Insert Not in Stock?
5 in-stock EPGT SKUs at 4.0 mm IC. For specialty EPMT (workhorse M-tolerance), 6.0 / 8.0 mm IC, or specific Tungaloy equivalent cross-references (Sandvik / Mitsubishi / Kennametal / Iscar / Walter), request a quote — 24-hour response, 2-3 day dispatch from Zhejiang, DHL/UPS worldwide 3-7 days.
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