SUMITOMO WNMG080404N-GU T1500A (WNMG 431-GU) Cermet Turning Insert
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SUMITOMO WNMG080404N-GU T1500A (WNMG 431-GU) High-Speed Steel Finishing Indexable Cermet Turning Insert
1. Product Overview
"Which indexable cermet insert grade and chipbreaker geometry provide the highest dimensional accuracy and mirror-like surface finish during high-speed continuous finish turning of carbon and alloy steels?"
The SUMITOMO WNMG080404N-GU T1500A (internationally designated under imperial nomenclature as WNMG 431-GU) is a next-generation indexable cermet turning insert engineered specifically for high-precision finishing operations on steel. Utilizing Sumitomo's advanced Brilliant Cermet T1500A micro-grained titanium carbonitride substrate paired with the versatile GU Type Chipbreaker geometry, this double-sided negative 80° trigon insert delivers unparalleled resistance to built-up edge (BUE), exceptional glossiness on the workpiece, and prolonged tool life under continuous high-speed cutting parameters.
2. Product Key Features
- Brilliant Cermet Substrate (T1500A): Formulated with a highly refined TiCN-based matrix that resists chemical affinity with iron molecules. This eliminates thermal welding and built-up edge formations, guaranteeing a mirror-like finish on carbon and alloy steels.
- Medium-to-Finishing GU-Type Chip Breaker: Features a low cutting resistance profile with a smooth deflector wall designed for precise chip control across varying depths of cut, avoiding bird-nesting and workpiece scratching.
- Superior Thermal & Chipping Resistance: Hybrid structural binding phases within the cermet matrix dramatically increase thermal shock resistance, allowing the insert to excel in high-speed dry cutting environments.
- 6 Economical Cutting Edges: The negative 80-degree trigon structural configuration balances the structural rigidity of a round insert with the profiling flexibility of a standard diamond, yielding 6 distinct indexable cutting edges for optimized operational economy.
3. Technical Specifications & Dimension Matrix
🔍 ISO / ANSI Nomenclature Decoding Matrix
Trigon Shape (80°)
0° Relief Angle
M-Class Tolerance
With Hole & Slots
Edge Length (9.525mm)
Thickness (4.76mm)
Nose Radius (0.4mm)
Finishing Breaker
| Dimension Parameter | Metric Specification (ISO) | Imperial Specification (ANSI) |
|---|---|---|
| Inscribed Circle (IC) | 9.525 mm | 0.375 in (3/8") |
| Thickness (S) | 4.76 mm | 0.187 in (3/16") |
| Corner Nose Radius (re) | 0.4 mm | 0.0156 in (1/64") |
| Fixing Hole Diameter (d1) | 3.81 mm | 0.150 in |
📊 Recommended Structural Cutting Parameters
| Workpiece Material Category | Cutting Speed (vc) | Feed Rate (f) |
|---|---|---|
| Low Carbon / Free-Cutting Steels (1018, 12L14) | 150 - 350 m/min (490 - 1150 SFM) | 0.05 - 0.20 mm/rev (0.002 - 0.008 ipr) |
| Alloy Steels / Carbon Steels (4140, 1045 Finishing) | 120 - 300 m/min (390 - 980 SFM) | 0.05 - 0.15 mm/rev (0.002 - 0.006 ipr) |
This WNMG0804 / WNMG431 sequence requires standard external or internal negative turning toolholders with a 95° approach angle.
Browse Matching MWLNR/L & WWLNR/L Toolholders →4. Product Application Scenarios
The T1500A cermet matrix provides ultimate dimensional stability in high-volume close-tolerance operations:
5. Toolholder & Equipment Compatibility
Strictly compliant with indexable geometric standard pocket seating, this insert integrates natively into global standard hardware:
- External Shank Holders: MWLNR2020K08, MWLNR2525M08, WWLNR2525M08 (Metric) / MWLNR16-4B, WWLNR16-4B (Imperial).
- Boring Bars (Internal): A32S-MWLNR08, A40T-MWLNR08 (Minimum bore diameter >= 40mm).
- Machine Support Guidelines: Engineered for high-speed CNC turning centers and multi-axis Swiss-style or live-tool lathes running stable clamping configurations to avoid harmonic chatter.
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Substrate Classification |
|---|---|---|---|
| SUMITOMO | T1500A (Target) | ISO P05 - P15 / General Precision Steel Finishing | Uncoated TiCN-Based Brilliant Cermet |
| Sandvik Coromant | CT5015 | ISO P01 - P15 / High Surface Quality Steel Turning | Uncoated Cermet Matrix |
| Kyocera | TN60 / TN620 | ISO P10 / High-Speed Steel Component Machining | Conventional / Hybrid Cermet Blend |
| Iscar | IC30N / IC20N | ISO P05 - P20 / Continuous Steel Fine Profiling | TiCN-Based Cermet Grade |
7. Why Choose Us & Verified Global Performance Evaluations
Real-world machine shop metrics proving exceptional surface finish and pocket wear control:
"We were running coated carbide inserts on 1045 gear shafts and struggling to stay within the surface roughness specs without constant offset adjustments. Switched to T1500A. The surface finish looks like a mirror, and it holds sizes over hundreds of parts."
"Perfekte Spanbrechung bei geringer Schnitttiefe dank der GU-Geometrie. Der T1500A Cermet glänzt bei der Hochgeschwindigkeitsbearbeitung von unlegiertem Stahl."
"Eccellente resistenza al tagliente di riporto sulla lavorazione a secco. Dimensioni del pezzo incredibilmente stabili su lotti voluminosi."
"S45Cの高速仕上げ旋削で使用しています。超硬チップに比べて構成刃先が全く発生しないため、面粗度が非常に美しく安定します。サーメット特有の耐熱摩耗性のおかげで寿命も長いです。"
8. Technical Machining FAQ
Q: When should I choose the T1500A cermet insert over a standard coated carbide insert?
A: You should select T1500A cermet when your goal is light to medium high-speed steel finishing (ISO P05-P15) where tight dimensional tolerances and exceptional Ra surface values are required. Cermet has a much lower chemical affinity with steel than carbide, preventing built-up edge (BUE) formation. However, for heavy roughing or severe interrupted cuts, standard coated carbide remains the standard choice.
Q: What makes the GU chipbreaker distinct from heavy roughing chipbreakers?
A: The GU chipbreaker is a highly versatile, low-force design optimized primarily for finishing and medium turning fields. Its specialized rake angle and pocket contour easily curl and fracture light, thin chips at lower depths of cut (ap). This prevents long stringy chips from nesting around the tool spindle or marking the polished workpiece skin.
Q: Is it safe to run the T1500A cermet insert with water-soluble cutting fluid?
A: Yes, cermets perform excellently under dry high-speed parameters, but they can be used with flood coolant during continuous turning. However, ensure that the coolant volume is highly consistent. Intermittent coolant supply or thermal pulsing at high cutting speeds can induce thermal shock cracking due to the brittle nature of cermet substrates.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Primary application falls within ISO P05 to P15 parameters. Engineered for continuous precision finishing of low-carbon steels, carbon construction steels (1045, S45C), and structural alloy steels (4140, SCM440) requiring low surface roughness profiles.
Machining Troubleshooting Guide: If rapid flank wear occurs, check that your cutting speed (vc) is matched to the alloy hardness, or decrease speed slightly. If the cutting edge suffers micro-chipping or sudden fracture, check for setup vibrations, increase the tool clamping rigidity, or minimize depth of cut across heavily interrupted sections.
Authorized Reference Documentation: Structural styling, insert dimensional bounds, and pocket layout configurations fully conform to the ISO 1832:2017 regulatory framework for indexable tooling systems. Operational limits are cross-referenced with published precision turning matrices by Sumitomo Electric Hardmetal Corp.
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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.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.