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

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

$94.43 USD

✓ In Stock & Fast Dispatch: Order processing: typically 1–3 business days after confirmation.
✓ Global Shipping: Delivery: generally 5–20 business days, depending on destination and shipping method.
✓ Guaranteed Quality: Check model, dimensions and compatibility before ordering. | Direct Factory Outlet
✓ Technical Support: Need grade selection help? Contact Engineer

💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF

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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.

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Technical FAQ & Buying Guide

How do I choose the correct specification?

When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.

How can I check compatibility with my existing setup?

For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.

What quantity and price unit am I ordering?

Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.

How should I choose cutting parameters?

Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.

Are bulk discounts available?

Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.

When will my order ship and arrive?

According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.