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Tungaloy TNMG160408-TM T9125 CVD Coated Carbide Turning Insert for Steel Machining - BEYOND

Tungaloy TNMG160408-TM T9125 CVD Coated Carbide Turning Insert for Steel Machining

$74.52 USD
Tungaloy TNMG160408-TM T9125 Turning Insert Toughened CVD Grade | TM Medium-Cutting Geometry | Industrial Excellence for Steel Which carbide insert is best for interrupted steel turning? The Tungaloy TNMG160408-TM T9125...
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Tungaloy TNMG160408R-S T9125 Right-Hand CVD Coated Carbide Turning Insert for Steel - BEYOND

Tungaloy TNMG160408R-S T9125 Right-Hand CVD Coated Carbide Turning Insert for Steel

$69.92 USD
Tungaloy TNMG160408R-S T9125 Turning Insert Right-Hand High-Efficiency Machining | T9125 CVD Grade | RS Finishing Geometry What is the most reliable right-hand insert for high-speed steel finishing? The Tungaloy TNMG160408R-S...
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Tungaloy TNMG160408L-S T9125 Left-Hand CVD Coated Carbide Turning Insert for Steel - BEYOND

Tungaloy TNMG160408L-S T9125 Left-Hand CVD Coated Carbide Turning Insert for Steel

$69.92 USD
Tungaloy TNMG160408L-S T9125 Turning Insert Left-Hand High-Stability Machining | T9125 CVD Grade | RS Finishing Geometry What is the best left-hand carbide insert for finishing alloy steel? The Tungaloy TNMG160408L-S...
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Tungaloy TNMG160404R-S T9125 Right-Hand CVD Coated Carbide Turning Insert for Steel - BEYOND

Tungaloy TNMG160404R-S T9125 Right-Hand CVD Coated Carbide Turning Insert for Steel

$69.92 USD
Tungaloy TNMG160404R-S T9125 Turning Insert Right-Hand Precision Steel Machining | T9125 CVD Technology | -S Finishing Geometry What is the best right-hand carbide insert for precision steel finishing? The Tungaloy...
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Tungaloy TNMG160404L-S T9125 Left-Hand CVD Coated Carbide Turning Insert for Steel - BEYOND

Tungaloy TNMG160404L-S T9125 Left-Hand CVD Coated Carbide Turning Insert for Steel

$69.92 USD
Tungaloy TNMG160404L-S T9125 Turning Insert Left-Hand Precision Steel Machining | T9125 CVD Technology | -S Finishing Geometry What is the best left-hand carbide insert for stable steel finishing? The Tungaloy...
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Tungaloy TNMG160408-TS NS9530 Cermet Turning Insert for High-Surface Finish Steel - BEYOND

Tungaloy TNMG160408-TS NS9530 Cermet Turning Insert for High-Surface Finish Steel

$40.03 USD
Tungaloy TNMG160408-TS NS9530 Cermet Insert High-Precision Cermet Grade | TS Finishing Geometry | Mirror Surface Quality What is the best cermet insert for high-gloss steel finishing? The Tungaloy TNMG160408-TS NS9530...
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Tungaloy TNMG160408R-S NS9530 Right-Hand Cermet Turning Insert for Steel Finishing - BEYOND

Tungaloy TNMG160408R-S NS9530 Right-Hand Cermet Turning Insert for Steel Finishing

$42.33 USD
Tungaloy TNMG160408R-S NS9530 Turning Insert Premium Right-Hand Finishing | NS9530 Cermet Grade | High-Gloss Surface Luster How do I achieve a high-gloss finish on steel parts with a right-hand tool?...
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Tungaloy TNMG160408-37 NS9530 Cermet Turning Insert for High-Speed Steel Finishing - BEYOND

Tungaloy TNMG160408-37 NS9530 Cermet Turning Insert for High-Speed Steel Finishing

$42.33 USD
Tungaloy TNMG160408-37 NS9530 Turning Insert Mirror Surface Finishing | -37 Precision Geometry | NS9530 Cermet Grade How do I achieve a high-gloss mirror finish on steel components? The Tungaloy TNMG160408-37...
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Tungaloy TNMG160404R-S NS9530 Right-Hand Cermet Turning Insert for Steel Finishing - BEYOND

Tungaloy TNMG160404R-S NS9530 Right-Hand Cermet Turning Insert for Steel Finishing

$42.33 USD
Tungaloy TNMG160404R-S NS9530 Turning Insert Right-Hand Precision Finishing | NS9530 Cermet Grade | Mirror Surface Luster What is the best right-hand cermet insert for high-gloss steel turning? The Tungaloy TNMG160404R-S...
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Tungaloy TN Series 60° Triangle Inserts | TNMG TNMA Negative Turning

Tungaloy TN 60° Triangle Negative Inserts

6 Effective Cutting Edges | Maximum Economic Efficiency | Heavy-Duty Roughing

Which insert offers the best cost-per-edge for high-volume steel turning and roughing?

The Tungaloy TN Series (primarily TNMG and TNMA) represents the pinnacle of economic turning. As a double-sided 60° triangular negative insert, it provides 6 usable cutting edges, making it the most cost-effective choice for heavy roughing and medium turning. Engineered with the latest T9200 PremiumTec CVD coating for steel or AH725 PVD for tough alloys, these inserts manage high temperatures effortlessly. The triangular geometry allows for significant metal removal rates (MRR) while maintaining a strong tool tip structure. Whether you are tackling interrupted cuts in cast iron or high-speed finishing in carbon steel, the TN series delivers predictable tool life and exceptional chip evacuation through specialized -TM and -PM chipbreaker geometries.

Decoding Tungaloy TN Series Nomenclature

T
Triangle 60°
N
Negative 0°
M / A
Tolerance
G
With Hole
16/22
Size (mm)
04
Thickness
04/08
Radius

6-Edge Economy

Double-sided design doubles the usable life per insert compared to positive triangular inserts, drastically reducing tooling costs.

PremiumTec Coating

Smooth surface finish of the coating prevents "built-up edge" (BUE) and improves heat dissipation during continuous dry cuts.

Superior Rigidity

Negative rake design provides a stronger cross-section, ideal for heavy depth-of-cut (Ap) in industrial manufacturing.

ISO vs. ANSI Model Reference

ISO Metric ANSI Imperial I.C. Size Recommended Ap
TNMG 160404-TM TNMG 331-TM 9.525 mm 0.5 - 3.0 mm
TNMG 160408-PM TNMG 332-PM 9.525 mm 1.0 - 4.5 mm
TNMG 220412-PR TNMG 433-PR 12.7 mm 2.0 - 6.0 mm

Suggested Cutting Parameters

Steel (T9215 Grade) Vc: 180 - 350 m/min | f: 0.20 - 0.50 mm/rev
Stainless Steel (AH725 Grade) Vc: 100 - 220 m/min | f: 0.15 - 0.40 mm/rev

Matching Tool Holders

Compatible with MTJNR/L and DTJNR/L Turning Tool Holders

Shop Heavy-Duty TNMG Holders

Primary Applications

  • Heavy roughing of carbon and alloy steel forgings.
  • Medium-to-heavy turning of cast iron components.
  • Interrupted cutting on large diameter shafts.
  • Borsing operations in deep holes (with SNR/L bars).

Equipment Compatibility

Optimized for use on CNC Lathes and Vertical Turning Centers (VTL) from Haas, Mazak, Doosan, Okuma, and DMG Mori.

Tungaloy TN Grade Performance Matrix

Grade Technology Ideal For
T9215 CVD PremiumTec Steel High-Speed Continuous Turning
AH725 PVD Multi-Layer Universal, Stainless Steel, Interrupted Cuts
T5115 CVD Heavy Duty Cast Iron Roughing and Finishing

Partnering with BEYOND CNC

Certified Original
Direct Tungaloy Supply
Rapid Fulfillment
Bulk Inventory Ready
Technical Edge
Directed by CNC Experts

Global Machinist Reviews

⭐⭐⭐⭐⭐ "Economic Powerhouse" - Robert B., USA
"Switched from CNMG to TNMG for our roughing stage. Getting 6 edges instead of 4 reduced our insert spend by 30% without losing speed."

⭐⭐⭐⭐⭐ "Fantastic in Ductile Iron" - M. Schneider, Germany
"The T5115 grade in TNMG 22 series handles the skin of large castings perfectly. Very tough edges."

⭐⭐⭐⭐ "Consistent Performance" - L. Ferraro, Italy
"Tungaloy TNMG is our standard for steel turning. BEYOND CNC always has the AH725 in stock for our rush orders."

Technical FAQ

Q: Can I use TNMG for finishing?

A: Yes, with the -TS or -PS chipbreakers and a small radius (0.2-0.4mm), TNMG can produce excellent surface finishes in steel and alloys.

Q: What is the difference between TNMG and TNMA?

A: TNMG has a chipbreaker for chip control, whereas TNMA is flat-topped (no chipbreaker), typically used for machining cast iron or using a separate chipbreaker clamp.

Tech Tip: Tool Pressure

Because the TN series has a 60° included angle, it generates higher radial tool pressure than an 80° CNMG. Always ensure your workpiece is securely clamped and use a tailstock for long shafts to prevent chatter. **BEYOND CNC** - Industrial Strength Solutions.

© Technical Document by Beyond Li - CNC Tooling Technical Director