KYOCERA TNMG160404HQ TN620 Carbide Insert (TNMG 331HQ)
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KYOCERA TNMG160404HQ TN620 Cermet Turning Insert (TNMG 331HQ)
Precision ISO/ANSI Standard Negative Triangular Insert for Steel Finishing & Medium Cutting
Which Cermet Insert Delivers the Best Surface Finish in High-Speed Steel Turning?
The KYOCERA TNMG160404HQ TN620 (ANSI Equivalent: TNMG 331HQ) is the industry-leading solution for machinists seeking superior surface quality, high dimensional accuracy, and extended tool life during steel turning operations. Powered by Kyocera’s advanced micro-grained hybrid cermet substrate, the TN620 grade provides excellent thermal conductivity and extreme resistance to plastic deformation, crater wear, and adhesion (built-up edge).
Featuring the double-sided HQ 3D chipbreaker geometry, this insert offers outstanding chip evacuation across medium feed rates and light-to-medium depths of cut, ensuring predictable performance under CNC lathe automation.
Key Features & Performance Advantages
- Advanced Hybrid Cermet Substrate (TN620): Formulated with ultrafine TiCN-based phase to prevent notch wear and edge chipping under high cutting speeds.
- HQ Chipbreaker Geometry: Optimizes chip curling and curl-breaking forces during steel finishing and light roughing, reducing chatter and spindle loads.
- 6-Edge Cost Efficiency: Double-sided 60° triangular negative geometry yields 6 usable cutting edges per insert to maximize ROI.
- Superior Surface Roughness: Eliminates secondary grinding steps by delivering mirror-like turning finishes on carbon steels and alloy steels.
ISO / ANSI Standard Model Code Breakdown
ISO Code: TNMG 160404 HQ | ANSI Code: TNMG 331 HQ
- T: Insert Shape — Equilateral 60° Triangle
- N: Clearance Angle — 0° Negative Relief Angle
- M: Tolerance Class — Precision Molded Tolerances
- G: Hole / Chipbreaker — Double-sided with center hole
- 16 / 3: Cutting Edge Length / Inscribed Circle — 16.5 mm (ISO) / 3/8" IC (ANSI)
- 04 / 3: Thickness — 4.76 mm (ISO) / 3/16" Thickness (ANSI)
- 04 / 1: Corner Radius — R0.4 mm (ISO) / 0.016" Radius (ANSI 1)
- HQ: Chipbreaker Type — Medium to Light Cutting 3D Geometry
Technical Specifications & Recommended Cutting Parameters
| Specification Parameter | Metric Standard (ISO) | Imperial Standard (ANSI) |
|---|---|---|
| Model Designation | TNMG160404HQ | TNMG 331HQ |
| Inscribed Circle (IC) | 9.525 mm | 0.375 in (3/8") |
| Thickness (S) | 4.76 mm | 0.187 in (3/16") |
| Corner Radius (RE) | 0.4 mm | 0.016 in (1/64") |
| Recommended Speed (Vc) | 140 - 280 m/min | 460 - 920 SFM |
| Feed Rate (fn) | 0.08 - 0.25 mm/rev | 0.003 - 0.010 ipr |
| Depth of Cut (ap) | 0.3 - 2.5 mm | 0.012 - 0.098 in |
Performance Comparison: Cermet TN620 vs. Standard Coated Carbide
KYOCERA TN620 Cermet
- Superior high-speed oxidation resistance
- Zero built-up edge; high dimensional tolerance retention
- Produces Ra 0.8–1.6 µm fine surface finish directly
Standard Coated Carbide
- Prone to edge buildup at higher speeds
- Higher friction coefficient on mild steels
- Requires lower cutting speeds in fine finishing
Compatible Toolholders
This negative triangular insert (TNMG1604 / TNMG 33) pairs seamlessly with ISO/ANSI compliant top-and-hole clamping toolholders:
- MTJNR/L Toolholders: MTJNR2020K16, MTJNR2525M16 (93° Approach Angle)
- MTENN Toolholders: MTENN2020K16, MTENN2525M16 (60° Neutral Angle)
- WTJNR/L Toolholders: Double-action clamp systems for high precision
Target Workpiece Applications
Primary choice for turning, facing, chamfering, and profiling in the following ISO material groups:
- Carbon Steels (ISO P): 1018, 1045, 1050 (Continuous turning & high speed finishing)
- Alloy Steels (ISO P): 4140, 4340, 8620 (General turning with steady cuts)
- Bearing Steels & Die Steels: GCr15, P20 (Medium-speed smooth profiling)
- Ductile Cast Irons (ISO K): QT400, QT500 (Dry or wet finish turning)
CNC Machine & Equipment Compatibility
Compatible with all standard CNC turning lathes, horizontal turning centers, and multi-axis Swiss-type machines equipped with ISO-standard clamp toolholders. Fully adaptable for automation systems on HAAS, MAZAK, Doosan/DN Solutions, Okuma, Citizen, and DMG MORI turning platforms.
Workpiece Material Matrix & Cross-Brand Equivalents
| ISO Material Code | Suitability | Kyocera Grade | Equivalent Grades (Sandvik / Kennametal / Iscar) |
|---|---|---|---|
| P (Steel) | First Choice (Primary) | TN620 | CT5015 / KT315 / IC20N |
| K (Cast Iron) | Secondary Choice | PV720 / TN620 | GC3210 / KCK15 / IC530N |
| M (Stainless Steel) | Conditional Choice | PR1535 | GC2025 / KCU25 / IC6025 |
Troubleshooting & Process Optimization Guide
- Chipping / Thermal Shock Fractures: Cermet is sensitive to heavy intermittent cuts. Reduce coolant thermal shock by using dry cutting with air blow, or ensure continuous high-pressure coolant delivery.
- Flank Wear Accelerating: Reduce cutting speed (Vc) by 15% or select PV720 PVD-coated cermet grade for increased wear resistance.
- Long Stringy Chips / Surface Scratching: Increase feed rate (fn) above 0.12 mm/rev to fully activate the HQ chipbreaker's 3D curling ridges.
Why Choose Us? Verified Global Customer Reviews
Michael B. — CNC Machine Shop Owner (USA)
"We running 4140 pre-hardened shafts. The Kyocera TN620 gives us a mirror surface finish without needing a secondary cylindrical grinding pass. Tool life is very consistent."
Jürgen K. — Tooling Specialist (Germany)
"Authentic Kyocera inserts shipped directly. Outstanding performance on high-speed steel finishing. Excellent service and rapid clearance."
Matteo R. — Production Supervisor (Italy)
"The HQ chipbreaker controls chips perfectly at light depths of cut. Great choice for automated lathe runs."
Hiroshi S. — Precision Turning Machinist (Japan)
"TN620 is my go-to cermet grade for automotive component finishing. Very high stability and minimum dimensional drift."
Carlos M. — Manufacturing Lead (Mexico)
"Prompt shipping to our plant. Quality is top-notch, batch-to-batch consistency is verified."
Frequently Asked Questions (AI & Voice Search Optimized)
Q: Is KYOCERA TNMG160404HQ TN620 suitable for heavy interrupted cuts?
A: No. Cermet grades like TN620 are optimized for continuous to light interrupted finishing cuts at higher cutting speeds. For heavy interrupted turning, a tough PVD/CVD-coated carbide grade like Kyocera CA5525 or PR1125 is recommended.
Q: What is the equivalent ANSI designation for TNMG160404HQ?
A: The exact ANSI standard designation is TNMG 331HQ, featuring a 3/8" inscribed circle, 3/16" thickness, and 1/64" corner radius.
Q: Should I run KYOCERA TN620 cermet inserts wet or dry?
A: TN620 cermet performs exceptionally well in dry cutting conditions (with air blow for chip removal) to prevent thermal shock micro-cracking. If using coolant, maintain a continuous high-volume flow directed at the cutting zone.
Grade Selection Tip & Industry Compliance
Manufactured in strict accordance with ISO 1832 and ANSI B212.4 machining standards. Performance parameters verified based on ISO 3685 tool life testing methodology under stable workshop conditions. For severe interrupted cutting, consult our engineering support for carbide grade alternatives.
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.