WALTER WNMG080404-FM5 WSM20S Turning Insert – 10 pcs
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WALTER WNMG080404-FM5 WSM20S Turning Insert (10pcs)
The WALTER WNMG080404-FM5 WSM20S is a high-performance negative-style carbide turning insert designed for stainless steel (M) and steel (P) machining. Equipped with the FM5 chipbreaker for low cutting forces and excellent chip control, and built with the advanced WSM20S PVD-coated grade, this insert delivers exceptional reliability in finishing and semi-finishing operations.
Product Features
- Optimized FM5 chipbreaker for low cutting force and stable chip flow.
- WSM20S PVD-coated grade for stainless steel and steel turning.
- Excellent thermal resistance and edge stability.
- Outstanding performance in finishing and semi-finishing operations.
- Ideal for machining 304, 316, duplex, alloy steels, and more.
- Packaged in a box of 10 inserts.
Technical Specifications
| Insert Type | WNMG |
| Size | 080404 |
| Chipbreaker | FM5 (Finishing/Mild Cutting) |
| Grade | WSM20S (PVD Tiger·tec® Silver) |
| Material Class | Stainless Steel (M), Steel (P), Superalloys (S) |
| Coating | PVD AlTiN-based multilayer |
| Geometry | Negative style, double-sided |
| Application | Finishing & Semi-finishing |
| Packaging | 10 inserts per box |
WSM20S Grade – Performance & Benefits
WSM20S is Walter's premium PVD-coated carbide grade designed for universal machining of stainless steel (M) with strong performance in steel (P) and superalloys (S). Its advanced coating provides exceptional wear resistance, heat resistance, and toughness.
Material Performance Characteristics
- High resistance to built-up edge formation in stainless steel.
- Excellent edge stability for interrupted and unstable cuts.
- Superior thermal control at high cutting temperatures.
- Optimized substrate for toughness and reduced chipping.
- Versatile for multiple material groups with stable tool life.
Suitable Workpiece Materials
| Stainless Steel (M) | ⭐⭐⭐⭐⭐ Primary application |
| Steel (P) | ⭐⭐⭐⭐ Excellent for finishing |
| Superalloys (S) | ⭐⭐⭐ Suitable for light finishing |
| Cast Iron (K) | ⭐⭐ For general machining (not optimized) |
Recommended Cutting Parameters
A. Stainless Steel (ISO M)
- Finishing: Vc 80–160 m/min, f 0.08–0.18 mm/rev, ap 0.1–0.8 mm
- Semi-finishing: Vc 70–150 m/min, f 0.15–0.25 mm/rev, ap 0.5–2.0 mm
- Medium roughing: Vc 60–130 m/min, f 0.20–0.30 mm/rev, ap 1.0–3.0 mm
B. Steel (ISO P)
- Finishing: Vc 120–220 m/min, f 0.08–0.18 mm/rev, ap 0.2–1.0 mm
- Semi-finishing: Vc 100–180 m/min, f 0.15–0.30 mm/rev, ap 0.5–2.5 mm
- Light roughing: Vc 80–160 m/min, f 0.20–0.35 mm/rev, ap 1.0–3.0 mm
C. Cast Iron (ISO K)
- General turning: Vc 140–260 m/min, f 0.12–0.25 mm/rev, ap 0.2–2.0 mm
Recommended Toolholders
- Walter WL / SVJBR / MVJNR turning toolholders
- Any standard WNMG0804 negative-style toolholder
- CNC lathes and turning centers
Why Choose WALTER WNMG080404-FM5 WSM20S?
- Engineered for stainless steel stability and reliability.
- Premium PVD Tiger·tec® Silver grade with long tool life.
- Excellent chip control with FM5 geometry.
- Perfect for finishing and semi-finishing operations.
- Suitable for high-precision CNC machining.
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.