Tungaloy WNMG080416-TH T9125 Carbide Turning Insert – PVD Coated for Steel Heavy Semi-Finishing & Roughing
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Tungaloy WNMG080416-TH T9125 Carbide Turning Insert – PVD Coated for Heavy Steel Roughing & High-Feed Semi-Finishing
The most aggressive corner radius in the Tungaloy WNMG08 series. R1.6 corner with TH chipbreaker and T9125 tough grade — engineered for maximum material removal rate, heavy interrupted cuts, and the most demanding steel roughing applications on CNC lathes.
Product Overview
"Which WNMG insert can handle the heaviest steel roughing with maximum feed rates and interrupted cuts?"
The Tungaloy WNMG080416-TH T9125 is the ultimate high-productivity variant in the Tungaloy WNMG08 family. With an R1.6 corner radius — the largest available in the WNMG08 series — this insert delivers the maximum chip thinning effect, the strongest possible edge, and the highest feed rate capability of any WNMG08 insert. It is purpose-built for heavy semi-finishing and roughing of carbon steel, alloy steel, and cast steel where material removal rate (MRR) is the primary objective.
The R1.6 corner creates an extreme chip thinning effect: at fn = 0.50 mm/rev with ap = 3.0 mm, the actual chip thickness is approximately 0.22 mm — equivalent to running R0.4 at fn = 0.09 mm/rev. This allows programmed feed rates up to 0.70 mm/rev while maintaining manageable chip loads and cutting forces, enabling cycle time reductions of 40–60% compared to R0.8 variants in roughing operations.
Combined with the T9125 enhanced-toughness PVD grade and TH heavy-feed chipbreaker, this insert is the go-to choice for production environments where every second of cycle time counts and tool life predictability is critical.
Search Keywords:
Model Code Decoder – WNMG080416-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
1.6mm (R1.6)
Tungaloy Heavy-Feed
Tungaloy Grade
PVD TiAlN Series
P25 – Steel Semi-Finishing
R1.6 Corner Radius – The Chip Thinning Advantage
- Extreme chip thinning effect: At fn = 0.50 mm/rev with ap = 3.0 mm, actual chip thickness ≈ 0.22 mm. Allows programmed feeds up to 0.70 mm/rev while maintaining manageable cutting forces — 40–60% cycle time reduction vs. R0.8.
- Maximum edge strength: R1.6 distributes cutting forces over the largest possible arc in the WNMG08 series — critical for heavy interrupted cuts, forged surfaces with hard skin, and high depth-of-cut operations.
- Critical depth-of-cut rule: Always ensure ap > rε. For R1.6, minimum recommended ap = 2.0 mm. Running ap < rε causes rubbing, vibration, and rapid wear. For ap < 1.5 mm, use R0.8 or R1.2.
- TH heavy-feed groove: Designed for the extreme chip volumes generated at fn 0.35–0.70 mm/rev — wide groove with reinforced T-land edge handles heavy chip loads without jamming or edge fracture.
- Surface finish expectation: Ra 3.2–6.3 µm at typical roughing feeds. This insert is for stock removal, not surface finish — follow with WNMG080404-TSF T9115 for finishing.
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) | 1.6 mm | 1/16 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 (Heavy-Feed) | TH (Heavy-Feed) |
| 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) | 100–220 | 328–722 | 0.35–0.70 | 0.014–0.028 | 2.0–5.0 |
| Alloy Steel (P) | 80–180 | 262–591 | 0.30–0.60 | 0.012–0.024 | 2.0–4.5 |
| Cast Steel (P/K) | 70–160 | 230–525 | 0.30–0.55 | 0.012–0.022 | 2.0–4.0 |
| Stainless Steel (M) | 60–120 | 197–394 | 0.20–0.40 | 0.008–0.016 | 1.5–3.0 |
* R1.6 minimum recommended ap = 2.0 mm. Never run ap < rε (1.6 mm). Reduce speed by 15–25% for interrupted cuts or forged surfaces with hard skin.
Full WNMG08 Corner Radius Comparison
| Parameter | R0.4 (080404) | R0.8 (080408) | R1.2 (080412) | R1.6 (080416) ✓ |
|---|---|---|---|---|
| Corner Radius | 0.4 mm | 0.8 mm | 1.2 mm | 1.6 mm |
| Max Feed Rate (fn) | 0.20 mm/rev | 0.40 mm/rev | 0.60 mm/rev | 0.70 mm/rev |
| Best Surface Finish | Ra ≤ 0.4 µm | Ra ≤ 0.8 µm | Ra ≤ 1.6 µm | Ra ≤ 3.2 µm |
| Edge Strength | Good | Better | Excellent | Maximum |
| Chip Thinning Effect | Low | Moderate | High | Extreme |
| Tool Life vs. R0.4 | Baseline | +20–30% | +40–60% | +60–80% |
| Min. Depth of Cut | 0.2 mm | 0.5 mm | 1.5 mm | 2.0 mm |
| Best Application | Finishing | Semi-finishing | Semi-finishing/Roughing | Heavy Roughing |
✓ = Current product. R1.6 is the maximum corner radius in the WNMG08 series — use when MRR and tool life are the absolute priority.
🔧 Compatible Tool Holders (WNMG080416)
WNMG080416 uses the same MWLNR/L 08-pocket holders as all WNMG08 variants. For R1.6 heavy roughing, always use the largest shank size available for maximum rigidity:
For R1.6 heavy roughing: always use 25mm+ shank, ensure machine spindle power > 15 kW, and verify turret rigidity before running at maximum feed rates.
Applications
Tungaloy Grade Comparison – Steel Turning
| Grade | Coating | ISO Range | Best For | Toughness |
|---|---|---|---|---|
| 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, roughing, interrupted cuts | ★★★☆☆ |
| AH725 | CVD | P15–P30 | Semi-finishing to roughing, steel | ★★★★☆ |
| AH8015 | CVD | P25–P40 | Heavy roughing, severe interrupted cuts | ★★★★★ |
| T9115 (M) | PVD TiAlN | M10–M25 | Stainless steel finishing | ★★☆☆☆ |
✓ = Current product. For even heavier roughing conditions where T9125 chips, step up to AH725 or AH8015 (CVD grades with higher toughness).
Why Choose Us
Customer Reviews
"Using WNMG080416-TH T9125 for roughing 4340 steel shafts at fn 0.55 mm/rev. Cycle time dropped by 45% compared to our previous R0.8 inserts. Tool life is consistent and the R1.6 corner handles the interrupted cuts without any chipping. Best roughing insert we’ve used."
"Eingesetzt für die Schruppbearbeitung großer Wellen aus 42CrMo4 auf einem Schwerdrehzentrum. Mit fn 0.50 mm/rev und R1.6 erreichen wir eine Zerspanungsleistung, die mit R1.2 nicht möglich war. Standzeit und Prozesssicherheit überzeugen auch bei Schmiedeteilen mit harter Haut."
"Utilizzo WNMG080416-TH per la sgrossatura di grandi alberi in acciaio bonificato. Il raggio R1.6 permette avanzamenti molto elevati con ottima vita utensile. Importante rispettare la profondità di passata minima di 2mm per evitare vibrazioni."
"SCM440の大径軟の荒剥き加工に使用。R1.6のチップ薄屑効果でfn 0.55mm/revで加工でき、サイクルタイムが50%以上短縮。工具寿命も安定しており、大批量生産に最適です。"
"We rough cast steel rolls on a large lathe — hard spots, inclusions, and heavy interrupted cuts. WNMG080416-TH T9125 is the only insert that gives us consistent tool life in these conditions. The R1.6 corner absorbs the shock that was fracturing our R1.2 inserts."
"用于42CrMo大径轴粗加工，进给0.55mm/rev，切削速度150m/min。R1.6圆弧的薄屑效果非常显著，刷刀次数比R1.2多60%以上。生产效率大幅提升，强烈推荐。"
"Excelente inserto para desbaste pesado de acero forjado. El radio R1.6 aguanta bien los impactos de la piel de forja y permite avances muy superiores a R1.2. Vida de herramienta muy consistente en producción de ejes pesados para camiones."
Frequently Asked Questions
💡 Corner Radius & Grade Selection Tips – Tungaloy WNMG08 Complete Guide
- R0.4 (080404): Finishing only. Ra ≤ 0.4 µm, fn ≤ 0.20 mm/rev, ap ≥ 0.2 mm. Use with TSF chipbreaker and T9115 grade.
- R0.8 (080408): Semi-finishing. Ra ≤ 0.8 µm, fn ≤ 0.40 mm/rev, ap ≥ 0.5 mm. Use with TSF (T9115) or TH (T9125).
- R1.2 (080412): Semi-finishing/light roughing. Ra ≤ 1.6 µm, fn ≤ 0.60 mm/rev, ap ≥ 1.5 mm. Use with TH chipbreaker and T9125.
- R1.6 (080416) — This Product: Heavy roughing. Ra ≤ 3.2 µm, fn ≤ 0.70 mm/rev, ap ≥ 2.0 mm. Use with TH chipbreaker and T9125. Maximum MRR.
- Critical rule for all large radii: ap must always exceed rε. Running ap < rε causes rubbing, vibration, and rapid wear regardless of grade or chipbreaker.
- Grade escalation for interrupted cuts: T9115 → T9125 → AH725 → AH8015. Step up one grade for each increase in interruption severity.
- Three-pass strategy: R1.6/TH/T9125 (roughing) → R0.8/TH/T9125 (semi-finishing) → R0.4/TSF/T9115 (finishing) = optimal productivity + quality.
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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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