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 Content by cnchome-beyond.com - Scraping Protection Active
