TUNGALOY 8GR SERIES NS530
Professional Internal Grooving | 1.5mm, 2.0mm, 2.5mm | NS530 Cermet Grade
Product Overview
The Tungaloy 8GR Series (150/200/250) NS530 represents a high-tier solution for internal grooving operations. With width options of 1.5mm, 2.0mm, and 2.5mm, these indexable carbide inserts are engineered specifically for high-precision slotting within internal bores. The NS530 Cermet grade is the standout feature, offering exceptional chemical stability and resistance to built-up edge (BUE). This makes it the ideal choice for achieving high-speed finishing and mirror-like surfaces on steel workpieces. Designed and manufactured in Japan, the 8GR series ensures stable CNC machining and long-lasting tool life for your most demanding production runs.
Technical Designation Breakdown
8
Insert Size
G
Grooving
R
Right Hand
150-250
Width (x100)
Size Comparison: Metric vs. Imperial
| Model Number |
Metric Width (CW) |
Imperial Equivalent |
Corner Radius |
| 8GR150 NS530 |
1.50 mm |
0.059 inch |
0.15 mm |
| 8GR200 NS530 |
2.00 mm |
0.078 inch |
0.20 mm |
| 8GR250 NS530 |
2.50 mm |
0.098 inch |
0.20 mm |
NS530 Cermet: Precision & Surface Quality
The NS530 grade is a specialized Cermet (Ceramic-Metal composite) that excels in finishing applications. Because it has low affinity for iron-based materials, it virtually eliminates built-up edge, which is a common cause of poor surface finish in internal grooving. This long-tail keywords industry favorite allows for higher cutting speeds and significantly improves the brightness and accuracy of the groove flanks in precision machining of carbon and alloy steels.
Internal Groove Geometry
The 8GR geometry is designed to reduce cutting resistance and facilitate chip flow. In internal operations, where the chip space is restricted, this geometry prevents chip re-cutting, thereby protecting the surface finish of the bore and extending the life of your CNC machining tools.
Recommended Cutting Parameters
Optimized for P (Steel) and K (Cast Iron):
-
Cutting Speed (Vc): 90 - 180 m/min (295 - 590 SFM)
-
Feed Rate (f): 0.04 - 0.10 mm/rev (0.0015 - 0.0039 ipr)
*Pro Tip: For 2.5mm widths, ensure your boring bar has high rigidity to maintain the best surface finish provided by the NS530 Cermet.*
Global Verified Reviews
⭐⭐⭐⭐⭐ "Amazing Finish on Steel" - Johann B., Germany
"The 8GR200 NS530 is my go-to for internal finishing. The Cermet grade leaves a surface that looks polished. Much better than coated carbide for this application."
⭐⭐⭐⭐⭐ "Very Stable and Precise" - Takeshi N., Japan
"Tungaloy's 8GR series provides excellent dimensional stability. We use the 1.5mm for precision O-ring grooves and they are perfect every time."
⭐⭐⭐⭐ "Great Price for Tungaloy" - Mark D., USA
"Authentic Japanese inserts at a fair price. The 2.5mm width holds up really well in high-volume production runs on 1045 steel."
⭐⭐⭐⭐⭐ "Cleanest Groove Ever" - Paolo M., Italy
"We switched to NS530 for our internal finishing and the difference is huge. No more rubbing or gummy chips."
⭐⭐⭐⭐⭐ "Reliable and Fast" - Lee W., Singapore
"Fast shipping and the quality is exactly what you expect from Tungaloy. The 8GR series is very reliable in our CNC lathes."
Technical Q&A
Q: Can I use NS530 for machining Stainless Steel?
A: NS530 is a Cermet optimized for Steel (P) and Cast Iron (K). For gummy materials like 304/316 Stainless, a PVD carbide grade like AH725 is generally recommended for better toughness.
Q: What tool holders are compatible with the 8GR series?
A: These inserts fit Tungaloy **CTIR/L** or **GI-series** internal grooving bars designed for the size 8 insert pocket.
Q: Is this insert suitable for interrupted cuts?
A: Cermet is more brittle than carbide. For finishing, it is excellent, but for heavy interrupted cuts, a coated carbide grade is usually preferred to prevent chipping.
Expert Machining Tip: Cermet Advantage
When using **NS530 Cermet** for **internal grooving**, higher cutting speeds actually help improve surface finish. Cermet thrives in high-heat finishing environments where carbide would typically experience chemical wear. Always ensure stable clamping and a constant feed for the best precision machining results.
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