Tungaloy WNMG080412-TH T9125 Carbide Turning Insert – PVD Coated for Steel Semi-Finishing & Roughing
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Tungaloy WNMG080412-TH T9125 Carbide Turning Insert – PVD Coated for Steel Semi-Finishing & Roughing with R1.2
An 80° trigon carbide insert with R1.2 corner radius and TH chipbreaker, engineered for productive semi-finishing and light roughing of carbon steel and alloy steel. The largest corner radius in the WNMG08 series delivers maximum edge strength, highest feed rates, and superior tool life in demanding production environments.
Product Overview
"Which WNMG insert gives the longest tool life and handles the highest feed rates for steel semi-finishing and roughing?"
The Tungaloy WNMG080412-TH T9125 is the highest-feed, most robust variant in the Tungaloy WNMG080408 family. The R1.2 corner radius — the largest available in the WNMG08 series — provides maximum edge strength, superior chip thinning at high feeds, and the best tool life in semi-finishing and light roughing conditions. Combined with the T9125 grade (PVD TiAlN, enhanced toughness substrate) and TH chipbreaker (medium-to-heavy feed geometry), this insert is built for high-productivity turning where material removal rate (MRR) and tool life are the primary objectives.
The R1.2 corner is particularly effective in high-feed turning strategies — the larger nose radius creates a chip thinning effect that allows the actual chip thickness to remain manageable even at fn 0.40–0.60 mm/rev, enabling significantly higher productivity than R0.4 or R0.8 variants without proportionally increasing cutting forces.
Corner Radius Positioning in WNMG080412 vs. 080408 vs. 080404: R1.2 = maximum productivity & tool life for semi-finishing/roughing. R0.8 = balanced semi-finishing. R0.4 = precision finishing. Choose R1.2 when MRR and tool life matter most.
Search Keywords:
Model Code Decoder – WNMG080412-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
1.2mm (R1.2)
Tungaloy Heavy / Medium-Feed
Tungaloy Grade
PVD TiAlN Series
P25 – Steel Semi-Finishing
R1.2 Corner Radius & TH Chipbreaker – Engineering Advantages
- R1.2 chip thinning effect: At fn = 0.40 mm/rev with R1.2, the actual chip thickness is approximately 0.28 mm — equivalent to running R0.4 at fn = 0.12 mm/rev. This allows dramatically higher feed rates without proportionally increasing cutting forces or surface roughness.
- Maximum edge strength: The R1.2 corner distributes cutting forces over a larger arc, reducing stress concentration at the nose — critical for interrupted cuts, forged surfaces, and high-depth-of-cut operations.
- TH wide chip groove: Accommodates the heavy chip loads generated at fn 0.25–0.60 mm/rev, producing controlled, short chips that evacuate cleanly even at high MRR.
- Reinforced T-land edge: Wider micro-hone on the cutting edge provides superior resistance to chipping under mechanical shock — essential for semi-finishing of forged and cast steel.
- Surface finish trade-off: R1.2 achieves Ra 3.2 µm easily at high feeds; Ra 1.6 µm achievable at optimized parameters. For Ra ≤ 0.8 µm, use R0.4 or R0.8 variants.
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) | 1.2 mm | 3/64 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-to-Heavy Feed) | TH (Medium-to-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) | 130–250 | 427–820 | 0.25–0.55 | 0.010–0.022 | 1.0–4.0 |
| Alloy Steel (P) | 100–220 | 328–722 | 0.20–0.50 | 0.008–0.020 | 1.0–3.5 |
| Cast Steel (P/K) | 90–180 | 295–591 | 0.20–0.45 | 0.008–0.018 | 1.0–3.0 |
| Stainless Steel (M) | 70–140 | 230–459 | 0.15–0.35 | 0.006–0.014 | 0.5–2.0 |
* Parameters are starting recommendations. R1.2 corner enables higher feed rates via chip thinning. Reduce speed by 10–20% for interrupted cuts or forged surfaces with hard skin.
Corner Radius Full Comparison – WNMG08 Series
| Parameter | R0.4 (080404) | R0.8 (080408) | R1.2 (080412) ✓ |
|---|---|---|---|
| Corner Radius | 0.4 mm | 0.8 mm | 1.2 mm |
| Max Feed Rate (fn) | 0.20 mm/rev | 0.40 mm/rev | 0.60 mm/rev |
| Best Surface Finish | Ra ≤ 0.4 µm | Ra ≤ 0.8 µm | Ra ≤ 1.6 µm |
| Edge Strength | Good | Better | Best |
| Chip Thinning Effect | Low | Moderate | High |
| Tool Life (same conditions) | Baseline | +20–30% | +40–60% |
| Best Application | Precision finishing | Semi-finishing | Semi-finishing / Roughing |
| Min. Depth of Cut | 0.2 mm | 0.3 mm | 1.0 mm (avoid ≤ rε) |
* Important: When using R1.2, ensure depth of cut ap > 1.2 mm to avoid rubbing on the corner radius. For ap < 1.0 mm, use R0.4 or R0.8.
🔧 Compatible Tool Holders (WNMG080412)
The WNMG080412 insert uses the same MWLNR/L 08-pocket holders as WNMG080404 and WNMG080408. For R1.2 heavy-feed applications, 20mm+ shank holders are recommended for maximum rigidity:
For R1.2 high-feed applications, always use the largest shank size your machine turret accepts to maximize rigidity and minimize vibration.
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, interrupted cuts, roughing | ★★★☆☆ |
| 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. T9125 + R1.2 + TH = the highest-productivity combination in the Tungaloy WNMG PVD lineup for steel semi-finishing and roughing.
Why Choose Us
Customer Reviews
"Running WNMG080412-TH T9125 on 4340 alloy steel shafts at fn 0.45 mm/rev. Tool life is outstanding — we’re getting 40% more parts per edge compared to our previous R0.8 inserts. The R1.2 corner handles the high feeds without any chipping. Game changer for our production line."
"Perfekt für die Halbschlichtbearbeitung großer Wellen aus 42CrMo4. Mit fn 0.40 mm/rev und R1.2 erreichen wir eine deutlich höhere Zerspanungsleistung als mit R0.8. Standzeit und Prozesssicherheit überzeugen auch bei Schmiedeteilen."
"Utilizzo WNMG080412-TH per la semi-finitura di alberi in acciaio bonificato di grande diametro. Il raggio R1.2 permette avanzamenti elevati con ottima vita utensile. Ideale per operazioni di sgrossatura leggera prima della finitura."
"SCM440の大径軟の半仕上げ加工に使用。R1.2のチップ薄化効果で送り量を大幅に上げられ、サイクルタイムが30%短縮。工具寿命も安定しており、大批量生産に最適です。"
"We use WNMG080412-TH T9125 for semi-finishing large cast steel rolls. The R1.2 corner absorbs the shock from hard spots and inclusions that were destroying our R0.8 inserts. Consistent tool life across the whole batch — highly recommended for cast steel."
"用于42CrMo大径轴半精加工，进给0.45mm/rev，切削速度180m/min。R1.2圆弧的薄屑效果非常明显，刷刀次数比R0.8多50%以上。生产效率大幅提升，强烈推荐。"
"Excelente inserto para desbaste leve de aço forjado. O raio R1.2 aguenta bem os impactos da pele de forja e permite avancos muito maiores que R0.8. Vida de ferramenta muito consistente na produção em série de eixos pesados."
Frequently Asked Questions
💡 Corner Radius & Grade Selection Tips – Tungaloy WNMG Series
- Corner Radius Selection Rule: R0.4 = finishing (Ra ≤ 0.4 µm, fn ≤ 0.20, ap ≥ 0.2 mm) | R0.8 = semi-finishing (Ra ≤ 0.8 µm, fn ≤ 0.40, ap ≥ 0.5 mm) | R1.2 = semi-finishing/roughing (Ra ≤ 1.6 µm, fn ≤ 0.60, ap ≥ 1.2 mm).
- Critical R1.2 rule: Always ensure ap > rε (depth of cut greater than corner radius). For R1.2, minimum recommended ap = 1.5 mm. Running ap < rε causes rubbing, vibration, and premature wear.
- T9115 (PVD): Best for finishing to semi-finishing of steel and stainless. Use with TSF chipbreaker and R0.4 or R0.8.
- T9125 (PVD) — This Product: Enhanced toughness for semi-finishing and roughing with interrupted cuts. Use with TH chipbreaker and R0.8 or R1.2.
- AH725 (CVD): Step up from T9125 for heavier roughing conditions or when dry cutting at high speeds is required.
- AH8015 (CVD): Maximum toughness for severe interrupted cuts and heavy roughing. Last resort when T9125 still chips.
- Two-pass strategy: Use WNMG080412-TH T9125 for semi-finishing (high MRR), then WNMG080404-TSF T9115 for finishing (high surface quality) — optimal productivity and quality combination.
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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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