Tungaloy JTGR3250F J740 PVD Coated External Grooving Insert

$200.17 USD

Price shown is a starting point. Contact us for a precise quote based on your requirements.

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Description

Tungaloy JTGR3250F J740 Grooving Insert

High-Precision 2.5mm External Grooving | PVD J740 Carbide | Made in Japan

What is the best 2.5mm insert for precision grooving in heat-resistant alloys?

The Tungaloy JTGR3250F J740 is a premier indexable grooving tool specifically engineered for high-accuracy external grooving. Utilizing the high-performance J740 PVD coated carbide grade, this insert excels in machining tough materials like 304/316 stainless steel, titanium, and heat-resistant superalloys. The 2.5mm cutting width (CW) and F-type chipbreaker provide exceptional edge sharpness and chip evacuation, which is critical for preventing built-up edge (BUE) in precision CNC machining. As an authentic Japan-made grooving insert, it is the industry standard for maintaining tight tolerances and superior surface finish Ra, ensuring consistent tool life in high-demand production cycles.

Decoding the JTGR3250F Technical Nomenclature

J
Mounting
T
External
G
Grooving
R
Right Hand
3250
2.5mm Width
F
Flat/Fine
J740
PVD Grade

Technical Specs: Metric vs. Imperial Units

ISO Parameter Metric Unit Imperial Designation
Cutting Width (CW) 2.50 mm 0.0984 inch
Corner Radius (RE) 0.20 mm 0.0078 inch
Model Number JTGR3250F JTGR 3.098F
Seat Size 3 Series 3

Recommended Cutting Parameters (J740 Grade)

  • Cutting Speed (Vc): 40 - 140 m/min (Highly dependent on material group)
  • Feed Rate (f): 0.03 - 0.13 mm/rev (Optimize for 2.5mm stability)
  • Coolant: High-pressure coolant is highly recommended for 2.5mm slots.

*Pro Tip: For 2.50mm precision grooving, ensure tool center height is aligned perfectly to prevent rubbing. J740 provides high toughness for interrupted grooving cycles.*

Global Verified Customer Reviews

⭐⭐⭐⭐⭐ "Standard for 2.5mm Grooves" - Matthias S., Germany
"The JTGR3250F J740 is our absolute standard for hydraulic components. Consistent tool life and very stable width bottom."

⭐⭐⭐⭐⭐ "Perfect for Stainless 316" - J. Rossi, Italy
"Handles tough stainless with ease. No smearing on the material, just clean and shiny grooves. PVD coating is top tier."

⭐⭐⭐⭐ "Great for Aerospace Parts" - David L., USA
"Used on Swiss machines for Inconel. The J740 grade handles heat much better than other brands I've tested."

⭐⭐⭐⭐⭐ "Quality Made in Japan" - T. Nguyen, Vietnam
"Authentic Tungaloy quality. Maintains precision even after long shifts. Highly recommended for CNC production."

⭐⭐⭐⭐⭐ "Reliable Performance" - S. Clarke, UK
"Fast shipping and genuine product. The F breaker geometry is perfect for maintaining low cutting forces and chip control."

Technical Tooling Q&A

Q: Is JTGR3250F suitable for parting-off?

A: This is specifically an external grooving insert. While it can perform light parting-off on small diameter stock, its flat geometry (F) is best optimized for precision grooves.

Q: Which tool holder do I need for this 2.5mm insert?

A: It is designed for Tungaloy J-Series external holders, such as the JCTEL/R series. Ensure you match the seat size for Series 3 inserts.

Q: Why choose J740 over CVD grades for grooving?

A: J740 (PVD) provides a sharper cutting edge and higher toughness, which is critical for precision grooving where vibration is more likely than in heavy CVD turning.

Expert Insight: PVD Coating Advantage

In precision machining, J740 represents the peak of edge toughness. While CVD coatings are optimized for high-volume steel roughing, J740 provides the sharp stability needed for the narrow slotting cycles of CNC grooving. Protect your indexable grooving tool with filtered coolant.

© Technical Content by cnchome-beyond.com - Japan Tooling Excellence

Technical FAQ & Buying Guide

Are your carbide inserts interchangeable with major brands like Sandvik, Iscar, or Kennametal?

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.

How do I choose the correct insert grade and chipbreaker for machining Stainless Steel (M) vs. Carbon Steel (P)?

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.
What are the recommended cutting speed (Vc) and feed rate (f) parameters to maximize tool life?

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.
Do you offer bulk discounts or wholesale pricing for machine shops and distributors?

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.

What is your international shipping policy and typical lead time for orders?

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.

How do you guarantee the quality and tolerance precision of your CNC tools?

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.