Tungaloy 16IR 2.5ISO-B AH725 Internal Threading Carbide Insert (10pcs)

Name: Tungaloy 16IR 2.5ISO-B AH725 Internal Threading Carbide Insert (10pcs)
Brand: BEYOND
SKU: 16IR25ISO-BAH725
Price: 94.43 USD
Availability: InStock

$94.43 USD

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

Order in the next [totalHours] hours %M minutes to get it between and

Description

Description

TUNGALOY 16IR 2.5ISO-B AH725

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

Product Overview

The Tungaloy 16IR 2.5ISO-B AH725 is a heavy-duty internal threading insert engineered for 2.5mm pitch ISO metric threads, commonly used for M18, M20, and M22 internal fasteners. This indexable carbide insert features the advanced AH725 PVD coated carbide grade, providing superior edge toughness and wear resistance for demanding CNC machining. The specialized "-B" chipbreaker geometry is essential for internal threading, forcing chips to curl tightly in confined spaces to prevent surface scratching and tool damage. Made in Japan, this insert is the professional choice for precision machining in stainless steel, carbon steel, and heat-resistant alloys.

Technical Designation Breakdown

16
Size (IC)

I
Internal

R
Right Hand

2.5
Pitch (mm)

ISO
Standard

B
Chipbreaker

Technical Specifications: Metric vs. Imperial

Technical Feature	Metric (ISO)	Imperial (TPI)
Thread Pitch	2.5 mm	10.16 Threads Per Inch
Inscribed Circle (IC)	9.525 mm	3/8 inch
Standard Fastener	M18 - M22 Internal	10 TPI Coarse Threads

Pitch Selection Guidance: The 2.5ISO is a Full Profile insert. This ensures the insert forms the complete thread profile—crest, root, and flank—in one cycle. This is critical for internal threading, as it guarantees the correct minor diameter and profile geometry within the bore, ensuring a perfect fit with matching bolts without needing secondary deburring.

Material: AH725 PVD Nano-Coating

The AH725 grade is Tungaloy's premium choice for stainless steel turning and threading. It features a micro-grain carbide substrate with a multilayered PVD coating. This long-tail keywords industry favorite provides exceptional resistance to notch wear and thermal cracking, resulting in significantly extended tool life in tough machining environments.

-B Geometry: Internal Chip Control (槽型)

Efficient chip evacuation is vital for internal work where space is limited. The -B chipbreaker forces chips to curl tightly, breaking them into manageable lengths that can be easily flushed out of the bore. This prevents "bird-nesting" and ensures the mirror-like surface finish required in precision 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: 1.53 mm
Number of Passes: 12 - 18 passes (Recommended for 2.5 pitch depth)

*Pro Tip: For 2.5mm internal pitches, use a modified flank infeed (27° to 29°) to reduce tool pressure and prevent chatter in boring bars.*

Global Verified Reviews

⭐⭐⭐⭐⭐ "Perfect for M20 production" - Matthias B., Germany
"The 2.5 pitch is spot on. Very stable in stainless steel bores. Excellent Japanese quality."

⭐⭐⭐⭐⭐ "Great Chip Evacuation" - Yuki S., Japan
"The -B chipbreaker is a must for internal threads. No more bird-nesting in my deep bores. Highly recommend AH725."

⭐⭐⭐⭐ "Tough in Alloy Steel" - James R., USA
"Solid performance on 4140. Tool life is predictable and the finish is very clean. Fits my SNR bar perfectly."

⭐⭐⭐⭐⭐ "Mirror Finish" - Paolo C., Italy
"The thread flanks are very smooth. Authentic Tungaloy inserts make a huge difference in precision work."

⭐⭐⭐⭐⭐ "Best Wholesale Value" - Alexander G., UK
"Fast shipping and genuine products. These inserts last much longer than generic versions on the market."

Technical Q&A

Q: Which boring bar does this fit?

A: This fits all standard **SNR** internal threading bars with a 16-size (3/8" IC) pocket.

Q: Can I cut external threads with this?

A: No. This is a **16IR** (Internal Right-hand). For external work, you require the **16ER** series.

Q: Is AH725 suitable for Titanium alloys?

A: Yes! AH725 is a high-toughness PVD grade designed for steel, stainless, and heat-resistant superalloys like Titanium and Inconel.

Expert Machining Tip: Grade Selection

For internal threading, PVD grades like **AH725** are superior to CVD grades because they maintain a sharper cutting edge. This sharpness is essential to reduce cutting pressure and vibration in boring bars, leading to much better tool life and thread 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.