Tungaloy SEEN1203AFTNCR-14 NS740 Insert
High-Gloss Steel Finishing | NS740 Cermet Grade | Precision Made in Japan
What is the best insert for achieving a mirror finish on steel?
The Tungaloy SEEN1203AFTNCR-14 NS740 is a high-precision square milling insert specifically engineered for finishing operations on ISO P (Steel) materials. Unlike standard carbide, the NS740 Cermet grade offers exceptional chemical stability and resistance to "built-up edge" (BUE), which is essential for achieving a superior, high-gloss surface finish. Made in Japan, this insert features a specialized 14-degree rake angle to ensure smooth chip evacuation and reduced cutting forces during high-speed finishing cycles.
NS740 Cermet Technology
Cermet (Ceramic-Metal) grade provides higher wear resistance and thermal stability than carbide, specifically designed for high-speed finishing of carbon and alloy steels.
-14 High Rake Angle
The positive 14-degree geometry reduces cutting resistance, allowing for vibration-free machining and excellent dimensional accuracy on thin-walled parts.
Mirror-Like Surfaces
The low affinity for steel prevents workpiece material from welding to the insert, resulting in a cleaner cut and a much brighter surface finish.
Decoding SEEN1203AFTNCR-14 Technical Nomenclature
S
Square
E
20° Relief
E
Tolerance
N
Fixing
12
Size 12
03
3.18mm Thick
AF
Facet
NCR
Right Hand
14
14° Rake
3. Technical Specifications: Metric vs. Imperial
| Parameter |
Metric (ISO) |
Imperial Equivalent |
| Cutting Edge (L) |
12.7 mm |
1/2" (SEEN 42) |
| Thickness (S) |
3.18 mm |
1/8" |
| Wiper Dimension |
1.4 mm |
0.055" |
| Standard Grade |
NS740 (Cermet) |
Steel Grade Cermet |
Recommended Cutting Parameters (NS740 Cermet)
-
Cutting Speed (Vc): 150 - 350 m/min (Ideally dry machining)
-
Feed per Tooth (fz): 0.10 - 0.20 mm/t
-
Depth of Cut (Ap): 0.1 - 1.0 mm (Finishing range)
*Note: Cermets perform best at high speeds. Avoid using heavy coolant to prevent thermal cracking.*
4. Product Applications
- Fine finishing of low and medium carbon steel.
- Final surface machining of alloy steel components.
- Production of mold and die plates requiring high gloss.
- High-speed finishing for automotive valve parts.
5. Tool Compatibility
Compatible with Tungaloy Face Mills designed for SEEN 1203 size inserts (e.g., TPS11 or similar series). Fits all standard high-speed milling spindle configurations.
7. Why Choose CNCHome-Beyond?
Genuine Tungaloy
100% Original Japanese Stock
Machining Experts
Optimized Parameter Support
Industrial B2B
Global OEM Supplier
Fast Worldwide
Express Logistics & Tracking
Professional Machinist Feedback
⭐⭐⭐⭐⭐ "Mirror Finish" - Robert H., USA
"Switched from carbide to this NS740 cermet for finishing steel plates. The difference is night and day. Mirror finish every time."
⭐⭐⭐⭐⭐ "High Speed Stability" - B. Schneider, Germany
"We run these at 300 m/min dry. No built-up edge and the insert life is incredibly stable. Tungaloy Japan at its best."
⭐⭐⭐⭐ "Very Precise" - T. Sato, Japan
"Used for fine finishing of gear box housings. The dimensional control is excellent over a long batch."
⭐⭐⭐⭐⭐ "Great for B2B" - F. Bianchi, Italy
"Original packaging, original quality. CNCHome-Beyond is our go-to for Japanese cermets."
⭐⭐⭐⭐⭐ "Smooth Cuts" - S. Lim, Singapore
"The 14-degree rake really makes a difference on our older milling machines. Cuts much smoother with less noise."
8. FAQ - Finishing Center
Q: Should I use coolant with NS740 Cermet?
A: For cermets, dry machining with an air blow is generally recommended to prevent thermal shock and edge chipping.
Q: What is the maximum depth of cut?
A: This is a finishing insert. For best surface quality, keep the depth of cut (Ap) below 1.0mm.
Q: Does this fit SEEN 42 tool holders?
A: Yes, SEEN 1203 is the ISO metric size equivalent to the Imperial SEEN 42 size.
Expert Insight: Cermet vs. Carbide
While carbide is known for toughness, NS740 Cermet is the king of finish. Because cermet has a low chemical affinity for steel, it eliminates "smearing" and creates a sharp, bright surface. When your job requires a decorative or high-precision finish on steel components, SEEN1203AFTNCR-14 is the industrial professional's choice. Experience Japanese precision.
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