Tungaloy 11IR 1.75ISO-B AH725 Internal Threading Carbide Insert (10pcs)

Name: Tungaloy 11IR 1.75ISO-B AH725 Internal Threading Carbide Insert (10pcs)
Brand: BEYOND
SKU: 11IR175ISO-BAH725
Price: 93.47 USD
Availability: InStock

$93.47 USD

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Description

Description

TUNGALOY 11IR 1.75ISO-B AH725

Coarse Metric Internal Specialist | 1.75mm Pitch | AH725 Nano-PVD Coating

Product Overview

The Tungaloy 11IR 1.75ISO-B AH725 is a high-performance internal threading insert engineered for 1.75mm pitch ISO metric threads (the standard for M12 coarse threading). This indexable carbide insert features the world-renowned AH725 PVD coated carbide grade, providing the edge toughness and thermal resistance required for CNC machining of stainless steel, carbon steel, and difficult-to-cut superalloys. The "-B" chipbreaker is a critical feature for internal operations, ensuring that chips are curled and evacuated to prevent damage to the finished thread profile. Made in Japan, this insert is the professional choice for precision machining in automotive and heavy machinery hardware.

Technical Designation Breakdown

11
Size (IC)

I
Internal

R
Right Hand

1.75
Pitch (mm)

ISO
Metric

B
Chipbreaker

Technical Specifications: Metric vs. Imperial

Technical Feature	Metric (ISO)	Imperial (TPI)
Thread Pitch	1.75 mm	14.51 Threads Per Inch
Inscribed Circle (IC)	6.35 mm	1/4 inch
Application	Internal M12 x 1.75	Coarse equivalent

Pitch Selection Guidance: The 1.75ISO is a Full Profile insert. This ensures the tool forms the complete 60° thread—crest and root included. By using a full profile tool, you maintain exact minor diameter tolerances in internal threading, ensuring the M12 fastener fits perfectly every time without secondary OD/ID corrections.

Grade: AH725 PVD Nano-Coating

The AH725 grade is Tungaloy's premium choice for stainless steel turning and threading. It combines a micro-grain carbide substrate with a high-heat resistant PVD coating. This long-tail keywords industry favorite minimizes edge chipping and reduces built-up edge, resulting in significantly extended tool life in automated CNC production.

-B Geometry: Optimized Chip Control (槽型)

In internal operations, chips can easily clog the hole. The -B chipbreaker is designed to curl chips tightly and force them out of the bore. This is vital for precision machining where a clean thread flank and surface finish are required for high-load fasteners.

Recommended Cutting Parameters

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

Cutting Speed (Vc): 70 - 150 m/min (230 - 490 SFM)
Total Radial Depth: 1.07 mm
Number of Passes: 10 - 16 passes (Standard for 1.75 pitch)

*Pro Tip: For 1.75mm pitch internal threads, use a modified flank infeed (29°) to reduce tool pressure and avoid chatter.*

Global Verified Reviews

⭐⭐⭐⭐⭐ "Standard for M12 Jobs" - Yuri K., Germany
"Consistent 1.75 pitch accuracy. The -B chipbreaker handles chips much better than the standard flat-top inserts."

⭐⭐⭐⭐⭐ "Great life in Stainless" - Kenji T., Japan
"AH725 is a very stable grade. Using these on 316 stainless steel with no problems and very clean thread flanks."

⭐⭐⭐⭐ "Reliable Tooling" - Mark S., USA
"Original Tungaloy quality. Fits my SNR boring bars perfectly. Very fast shipping from this store."

⭐⭐⭐⭐⭐ "Smooth Finish" - Luca M., Italy
"The mirror finish on the internal thread is impressive. The chip control prevents any scoring of the bore."

⭐⭐⭐⭐⭐ "Excellent Value" - Liam O., Australia
"High performance and durability. Definitely saves money in the long run with fewer tool changes."

Technical Q&A

Q: Which tool holder fits this insert?

A: This fits any standard internal threading boring bar with an 11-size (1/4" IC) pocket, such as the **SNR0013M11** or **SNR0016Q11**.

Q: Is it suitable for Titanium?

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

Q: Can I use this for external threads?

A: No. This is an **11IR** (Internal Right-hand). For external threading, you need the **11ER** series.

Expert Machining Tip: Grade Comparison

For internal threading, PVD grades like **AH725** are superior to CVD grades because they maintain a sharper cutting edge. Sharpness is essential in internal bores to reduce radial pressure and prevent thread "tearing," resulting in much better tool life.

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.