Tungaloy RCMT0803MO-61 NS9530 Insert
Precision Round Turning | 61 Finishing Breaker | Premium NS9530 Cermet
How do I achieve a mirror-like surface finish on steel shafts?
The Tungaloy RCMT0803MO-61 NS9530 is a high-performance round cermet turning insert specifically engineered for high-speed finishing operations. Utilizing the advanced NS9530 cermet grade, this insert offers exceptional chemical stability and oxidation resistance, which effectively prevents built-up edge (BUE) and results in an ultra-smooth surface Ra. The 61 chipbreaker is designed for light-duty finishing, ensuring consistent chip management at high velocities. As a genuine Japan-made CNC turning insert, its round geometry provides the highest edge strength for profiling and demanding finishing cuts on carbon and alloy steels.
High-Speed Finishing
NS9530 grade excels at high cutting speeds (up to 350 m/min), reducing cycle times while maintaining precision.
Maximum Edge Strength
The round (RCMT) geometry eliminates weak corners, making it ideal for profiling and heavy-duty finishing.
61 Chipbreaker Design
Engineered for light depths of cut, providing low cutting forces and excellent surface integrity.
Decoding the RCMT0803MO-61 Nomenclature
R
Round
C
7° Relief
M
Tolerance
T
Hole/Fix
08
8mm Size
03
3.18mm Thick
MO
Surface
61
Breaker
Technical Specifications: Metric vs. Imperial Units
| ISO Parameter |
Metric Designation |
Imperial Designation |
| Inscribed Circle (IC) |
8.0 mm |
0.315 inch |
| Thickness (S) |
3.18 mm |
1/8 inch |
| Corner Radius (RE) |
4.0 mm (Full Round) |
0.157 inch |
| Hole Diameter (D1) |
3.4 mm |
0.134 inch |
Recommended Cutting Parameters (NS9530 Grade)
-
Cutting Speed (Vc): 150 - 350 m/min (Finishing Steel)
-
Feed Rate (f): 0.05 - 0.25 mm/rev (Optimized for 61 chipbreaker)
-
Depth of Cut (Ap): 0.2 - 1.5 mm
*Expert Tip: Cermet inserts perform best under dry machining conditions or with high-pressure air to prevent thermal shock and edge chipping.*
4. Product Applications
- High-speed finishing of carbon and alloy steels.
- Profiling operations on intricate automotive shafts.
- Machining of mold and die steel with high finish requirements.
- CNC Lathe profiling on Swiss-type and standard machines.
5. Tool Compatibility
Compatible with standard SRGCR/L or SRDCN turning tool holders designed for 8mm round positive inserts (Size 0803). Suitable for high-RPM precision spindles.
7. Why Choose CNCHome-Beyond?
100% Genuine
Original Tungaloy Japan
OEM Partnership
Geely Auto Supplier
Expert Support
CNC Tooling Professionals
Global Logistics
Fast Shipping Worldwide
Global Verified Reviews
⭐⭐⭐⭐⭐ "Mirror Surface Success" - Marco V., Italy
"The finish on our steel rollers is like glass. NS9530 cermet is far superior to carbide for this application."
⭐⭐⭐⭐⭐ "Very Stable Round Edge" - Takeshi H., Japan
"Round geometry is much stronger for profiling than standard diamond inserts. No chipping at high RPM."
⭐⭐⭐⭐ "Great Chip Control" - Brian L., USA
"The 61 breaker works perfectly on fine finishing passes. No bird-nesting on our Swiss lathes."
⭐⭐⭐⭐⭐ "Fast Shipping & Genuine" - Dieter G., Germany
"Authentic Tungaloy parts. The cermet grade is consistent and the tool life is excellent."
⭐⭐⭐⭐⭐ "Perfect for Precision" - S. Ramesh, Singapore
"Consistent dimensions over long runs. Essential for our precision turning department."
8. FAQ - Common Technical Questions
Q: Can I use this insert for roughing?
A: No, cermet is brittle compared to carbide. It is strictly for semi-finishing and high-precision finishing operations.
Q: Is it suitable for stainless steel?
A: Cermet is best for carbon and alloy steels. For stainless steel, we recommend PVD coated carbide like AH725 for better stability.
Q: Does it fit any round tool holder?
A: It fits any SRGCR/L or SRDCN holder designed for 8mm IC round positive inserts (Size 0803).
Expert Insight: The Cermet Advantage
In CNC finishing, cermet (NS9530) provides higher chemical stability than carbide at high temperatures. This prevents material from "sticking" to the tool edge, which is the key to achieving the RCMT0803 mirror-like finish and ensuring long-term precision machining performance.
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