Tungaloy WNMG080408-TH T9125 Carbide Turning Insert – PVD Coated for Steel Semi-Finishing
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Tungaloy WNMG080408-TH T9125 Carbide Turning Insert – PVD Coated for Steel Semi-Finishing & Interrupted Cuts
An 80° trigon carbide insert engineered for semi-finishing of carbon steel and alloy steel, including interrupted cuts and variable stock conditions. The T9125 grade’s enhanced toughness and TH chipbreaker geometry deliver reliable performance where T9115 reaches its limits.
Product Overview
"Which carbide insert handles interrupted cuts and variable stock in steel semi-finishing without chipping?"
The Tungaloy WNMG080408-TH T9125 is a precision-ground, 80° trigon carbide turning insert designed for semi-finishing operations on carbon steel, alloy steel, and cast steel, particularly in conditions involving interrupted cuts, forged surfaces, or variable stock allowances. The T9125 grade features a PVD TiAlN multi-layer coating over a tougher carbide substrate than T9115, providing superior resistance to micro-chipping and edge fracture under mechanical shock.
The TH chipbreaker geometry is Tungaloy’s medium-feed, high-toughness chipbreaker — designed with a wider chip groove and reinforced cutting edge land compared to the TSF geometry. This makes it ideal for semi-finishing at moderate-to-high feed rates (fn 0.15–0.40 mm/rev) where chip control and edge stability are equally important. The TH geometry handles the transition zone between finishing and roughing with confidence.
Key Difference vs. WNMG080408-TSF T9115: T9125 + TH offers more toughness and higher feed capability at the cost of slightly lower maximum cutting speed. Choose T9115/TSF for smooth continuous finishing; choose T9125/TH for semi-finishing with interruptions, scale, or forged surfaces.
Search Keywords:
Model Code Decoder – WNMG080408-TH T9125
Every character in the ISO insert designation carries precise engineering meaning:
80° Trigon (W)
0° (Negative)
±0.05–0.13mm
Hole + Chip Groove (Double-sided)
8.0mm (IC 9.525mm)
4.76mm
0.8mm (R0.8)
Tungaloy Heavy / Medium-Feed
Tungaloy Grade
PVD TiAlN Series
P25 – Steel Semi-Finishing
TH Chipbreaker Geometry Explained
- Wider chip groove width: Accommodates higher feed rates (fn 0.15–0.40 mm/rev) and heavier chip loads compared to TSF geometry — ideal for semi-finishing and medium-feed operations.
- Reinforced cutting edge land (T-land): Micro-honed edge with wider hone provides superior resistance to chipping during interrupted cuts, forged surfaces, and variable stock conditions.
- Moderate positive rake angle: Balances cutting force reduction with edge strength — lower cutting forces than negative geometries, more robust than TSF for demanding conditions.
- Optimized for P20–P35 range: Designed to handle the toughest steel semi-finishing scenarios where finishing geometries (TSF) would chip prematurely.
Key Features
Technical Specifications
Metric & Imperial Dimensions
| Parameter | Metric | Imperial |
|---|---|---|
| Insert Shape | 80° Trigon (W) | 80° Trigon (W) |
| Inscribed Circle (IC) | 9.525 mm | 3/8 in |
| Cutting Edge Length (L) | 8.0 mm | 0.315 in |
| Insert Thickness (S) | 4.76 mm | 0.1875 in |
| Corner Radius (rε) | 0.8 mm | 1/32 in |
| Clearance Angle | 0° (Negative) | 0° (Negative) |
| Tolerance Class | M (±0.05–0.13 mm) | M (±0.002–0.005 in) |
| Hole Diameter | 3.81 mm | 0.150 in |
| Grade | T9125 | T9125 |
| Coating | PVD TiAlN Multi-Layer | PVD TiAlN Multi-Layer |
| ISO Application | P20–P35, M20–M30 | P20–P35, M20–M30 |
| Chipbreaker | TH (Medium-Feed / Heavy) | TH (Medium-Feed / Heavy) |
| Usable Cutting Edges | 4 edges (double-sided) | 4 edges (double-sided) |
| Packaging | 10 pcs / box | 10 pcs / box |
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed Vc (m/min) | Cutting Speed Vc (SFM) | Feed Rate fn (mm/rev) | Feed Rate fn (in/rev) | Depth of Cut ap (mm) |
|---|---|---|---|---|---|
| Carbon Steel (P) | 150–280 | 492–919 | 0.15–0.40 | 0.006–0.016 | 0.5–3.0 |
| Alloy Steel (P) | 120–240 | 394–787 | 0.15–0.35 | 0.006–0.014 | 0.5–2.5 |
| Cast Steel (P/K) | 100–200 | 328–656 | 0.15–0.35 | 0.006–0.014 | 0.5–2.5 |
| Stainless Steel (M) | 80–160 | 262–525 | 0.12–0.25 | 0.005–0.010 | 0.3–1.5 |
* Parameters are starting recommendations. T9125 + TH is optimized for the mid-to-high feed range. Reduce speed by 10–20% for interrupted cuts or forged surfaces.
Chipbreaker Comparison – TSF vs TH
| Parameter | TSF (Finishing) | TH (Medium-Feed) ✓ |
|---|---|---|
| Feed Range (fn) | 0.05–0.20 mm/rev | 0.15–0.40 mm/rev |
| Depth of Cut (ap) | 0.2–1.5 mm | 0.5–3.0 mm |
| Edge Strength | Good | Excellent |
| Interrupted Cut Resistance | Moderate | High |
| Surface Finish Potential | Ra ≤ 0.8 µm | Ra 1.6–3.2 µm |
| Best Application | Finishing, thin-wall parts | Semi-finishing, interrupted cuts |
| Recommended Grade | T9115 | T9125 ✓ |
🔧 Compatible Tool Holders (WNMG080408)
The WNMG080408 insert requires MWLNR/L or DWLNR/L series tool holders with an 08 pocket designation:
Contact us to confirm compatibility with your specific machine setup and turret type.
Applications
Tungaloy Grade Comparison – Steel Turning
| Grade | Coating | ISO Range | Best For | Toughness Level |
|---|---|---|---|---|
| T9105 | PVD TiAlN | P05–P15 | High-speed finishing, hardened steel | ★☆☆☆☆ |
| T9115 | PVD TiAlN | P10–P25 | Finishing to semi-finishing, steel & SS | ★★☆☆☆ |
| T9125 ✓ | PVD TiAlN | P20–P35 | Semi-finishing, interrupted cuts, forged | ★★★☆☆ |
| AH725 | CVD | P15–P30 | Semi-finishing to roughing, steel | ★★★★☆ |
| AH8015 | CVD | P25–P40 | Roughing, heavy interrupted cuts | ★★★★★ |
| T9115 (M) | PVD TiAlN | M10–M25 | Stainless steel finishing | ★★☆☆☆ |
✓ = Current product. T9125 sits between T9115 (wear resistance) and AH725 (toughness) — the ideal semi-finishing grade for demanding steel conditions.
Why Choose Us
Customer Reviews
"Running WNMG080408-TH T9125 on forged 4140 steel flanges with interrupted cuts. Zero chipping issues — this grade handles the interruptions that were destroying our T9115 inserts. Tool life is consistent and predictable across the whole production run."
"Perfekt für die Halbschlichtbearbeitung von 42CrMo4 mit Unterbrechungen. Die TH-Geometrie ist deutlich robuster als TSF bei ähnlicher Oberflächenqualität. Standzeit überzeugt auch bei Schmiedeteilen mit Zunder."
"Utilizzo T9125 per la semi-finitura di alberi in acciaio bonificato con scanalature. La geometria TH gestisce bene le interruzioni senza scheggiature. Ra 1.6 raggiunto facilmente. Ottimo rapporto qualità-prezzo."
"SCM440の断続切削に使用。T9115では欠损が発生していた箇所でもT9125は安定しています。TH槽型の切削抗力も許容範囲内で、大批量生産に自信を持って使えます。"
"We machine cast steel pump housings with hard spots and inclusions. T9125 + TH is the only insert combination that gives us consistent tool life without random edge failures. Highly recommended for cast steel applications."
"用于42CrMo调质齿轮轴半精加工，断続切削条件下表现非常稳定。TH槽型切削力适中，刷刀次数比T9115多30%以上。性价比高，强烈推荐。"
"Excelente inserto para semi-acabado de acero forjado. La geometría TH aguanta bien las interrupciones y la piel de forja. Vida de herramienta muy consistente en producción de ejes de transmisión."
Frequently Asked Questions
💡 Grade & Chipbreaker Selection Tips – Tungaloy Steel Turning Series
- T9105 (PVD): Maximum wear resistance for high-speed finishing of hardened steel. Lowest toughness — avoid interrupted cuts.
- T9115 (PVD): Best balance for finishing to semi-finishing of steel and stainless. Use with TSF for smooth continuous cuts.
- T9125 (PVD) — This Product: Enhanced toughness for semi-finishing with interrupted cuts, forged surfaces, and variable stock. Use with TH chipbreaker.
- AH725 (CVD): High-speed semi-finishing to roughing. Superior crater wear resistance for dry cutting — step up from T9125 for heavier conditions.
- AH8015 (CVD): Maximum toughness for heavy roughing and severe interrupted cuts. When nothing else survives, use AH8015.
- Chipbreaker guide: TSF = finishing (fn 0.05–0.20) | TH = semi-finishing/interrupted (fn 0.15–0.40) | TR = roughing (fn 0.30–0.60). Match chipbreaker to feed rate first, then select grade based on workpiece condition.
- Interrupted cut rule: For every interruption per revolution, step up one toughness level: T9115 → T9125 → AH725 → AH8015.
Need Help With Tungaloy Inserts?
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This Tungaloy insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
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