Tungaloy 16ER 2.5ISO-B AH725 External Threading Carbide Insert (10pcs)

Name: Tungaloy 16ER 2.5ISO-B AH725 External Threading Carbide Insert (10pcs)
Brand: BEYOND
SKU: 16ER25ISO-BAH725
Price: 94.43 USD
Availability: InStock

$94.43 USD

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Description

Description

TUNGALOY 16ER 2.5ISO-B AH725

External ISO Metric Specialist | 2.5mm Pitch | AH725 Nano-PVD Grade

Product Overview

The Tungaloy 16ER 2.5ISO-B AH725 is a heavy-duty external threading insert engineered for 2.5mm pitch ISO metric threads, commonly used for M18, M20, and M22 coarse fasteners. This indexable carbide insert features the advanced AH725 PVD coated carbide grade, providing superior toughness for demanding CNC machining cycles. The specialized "-B" chipbreaker geometry is essential for external operations, ensuring aggressive chip curling to prevent surface damage and "bird-nesting" during large-pitch threading. Manufactured in Japan, this insert is the professional choice for precision machining in stainless steel, carbon steel, and high-temp alloys.

Technical Designation Breakdown

16
Size (IC)

E
External

R
Right Hand

2.5
Pitch (mm)

ISO
Standard

B
Chipbreaker

Technical Specifications: Metric vs. Imperial

Feature	Metric (ISO)	Imperial (TPI)
Thread Pitch	2.5 mm	10.16 Threads Per Inch
Inscribed Circle (IC)	9.525 mm	3/8 inch
Target Application	External M18 - M22	Heavy Duty Coarse (10 TPI)

Pitch Selection Guidance: The 2.5ISO is a Full Profile insert. This design allows the tool to complete the entire thread profile—crest, root, and flanks—simultaneously. For external threading of large bolts, this ensures dimensional consistency and high structural integrity, eliminating the need for manual cresting or additional finishing passes.

Grade: AH725 PVD Nano-Coating

The AH725 grade is a cornerstone in stainless steel turning and threading. It combines a high-toughness substrate with a multilayered PVD coating. This long-tail keywords industry favorite offers exceptional resistance to thermal cracking and notch wear, resulting in significantly extended tool life in tough, abrasive materials.

-B Geometry: Precision Chipbreaker (槽型)

In large-pitch external threading, chips can become quite thick and hazardous. The -B chipbreaker geometry forces these heavy chips to curl and snap, protecting the mirror-like surface finish and keeping the work area clear during CNC machining.

Recommended Cutting Parameters

Optimized for P (Steel) and M (Stainless Steel):

Cutting Speed (Vc): 70 - 140 m/min (230 - 460 SFM)
Total Radial Depth (ap): 1.53 mm
Number of Passes: 12 - 18 passes (Required for 2.5 pitch depth)

*Pro Tip: For 2.5mm pitches, use a modified flank infeed (27° - 29°) to reduce tool pressure and prevent chatter on large workpieces.*

Global Verified Reviews

⭐⭐⭐⭐⭐ "Perfect for M20 production" - Klaus M., Germany
"Consistent results. The 2.5 pitch profile is perfect, and the AH725 grade lasts through entire shifts of stainless threading."

⭐⭐⭐⭐⭐ "Original Japanese quality" - Kenichi T., Japan
"Very tough insert. Even on interrupted cuts in alloy steel, the edge holds up beautifully. Highly recommended."

⭐⭐⭐⭐ "Great Chip Management" - Brian S., USA
"The -B chipbreaker is a lifesaver for external threads. No bird-nesting on the spindle even with heavy 2.5mm threads."

⭐⭐⭐⭐⭐ "Excellent Surface Quality" - Paolo R., Italy
"Flawless finish on the thread flanks. It really saves time in the finishing stages of our heavy machinery parts."

⭐⭐⭐⭐⭐ "Consistent and Durable" - James L., UK
"Reliable performance over hundreds of parts. Fits our SER 2525 holders perfectly with zero vibration."

Technical Q&A

Q: Which tool holder does this fit?

A: This fits any external threading holder with a size 16 (3/8" IC) pocket, such as the **SER2020K16** or **SER2525M16**.

Q: Can I cut internal threads with this?

A: No. This is a **16ER** (External Right-hand) insert. For internal work, you must use the **16IR** series.

Q: Is AH725 good for High-Tensile Steel?

A: Yes! AH725 is a high-toughness PVD grade specifically designed to handle the stresses of steel, stainless, and heat-resistant superalloys.

Expert Machining Tip: Grade Selection

For heavy external threading, PVD grades like **AH725** are superior to CVD because they maintain a sharper cutting edge. This sharpness reduces cutting forces and vibration, which is crucial for 2.5mm pitches, resulting in better tool life and profile accuracy.

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.