Tungaloy 11IR05ISO-B AH725 Threading Insert
Precision Internal ISO Metric Threads | 0.5mm Pitch | AH725 PVD Grade
What is the best insert for small diameter internal metric threading?
The Tungaloy 11IR05ISO-B AH725 is a high-precision internal threading insert designed for 60° ISO metric threads with a 0.5mm pitch. Utilizing the world-renowned AH725 PVD coated carbide grade, this insert is optimized for machining steel, stainless steel, and heat-resistant alloys. The "B" type geometry features a specialized chipbreaker that prevents chip nesting in small-diameter bores, ensuring a smooth threading process and superior surface finish. Made in Japan, this CNC threading insert is the professional choice for high-accuracy mechanical components.
AH725 Premium PVD Grade
A tough carbide substrate paired with a high-aluminum PVD coating. It provides exceptional resistance to chipping and built-up edge, especially in stainless steel.
-B Chipbreaker Geometry
Specially designed for internal applications. It forces chips to curl and evacuate efficiently, preventing damage to the thread profile or the boring bar.
Ultra-Sharp Cutting Edge
Precision-ground profile ensures the 60° thread angle is maintained perfectly across thousands of cycles, delivering "Go/No-Go" gauge consistency.
Decoding 11IR05ISO-B Technical Nomenclature
11
6.35mm IC
I
Internal
R
Right Hand
05
0.5mm Pitch
ISO
Metric Profile
B
Chipbreaker
3. Technical Specifications: Metric vs. Imperial
| Attribute |
Metric Value |
Imperial Equivalent |
| Inscribed Circle (IC) |
6.35 mm |
1/4 inch |
| Thread Type |
ISO Metric (60°) |
N/A |
| Pitch / TPI |
0.50 mm |
Approx. 51 TPI |
| Standard Designation |
11IR05ISO |
IR 1/4 0.5 ISO |
Recommended Threading Parameters (AH725)
-
Cutting Speed (Vc): 60 - 150 m/min (Material dependent)
-
Number of Passes: 4 - 8 passes (For 0.5mm pitch)
-
Infeed Method: Flank Infeed (Recommended for chip control)
*Note: Ensure the boring bar is as short as possible to minimize vibration during threading.*
4. Product Applications
- Internal threading of small diameter steel shafts.
- Stainless steel (304/316) medical and aerospace parts.
- Precision electronics housings with fine metric threads.
- High-speed threading in CNC automatic lathes (Swiss type).
5. Tool Compatibility
Fits all standard SNR type internal threading boring bars that accept 11IR (1/4" IC) inserts. Works perfectly with Tungaloy StreamJetBar series for vibration-free threading.
7. Why Choose CNCHome-Beyond?
Genuine Tungaloy
100% Original Japanese Parts
Threading Experts
Supply Chain for Precision OEM
Technical Support
Pass & Infeed Optimization
Express Logistics
Fast Global Shipping
Verified Global Feedback
⭐⭐⭐⭐⭐ "Perfect Metric Threads" - David K., USA
"The 0.5mm pitch is very delicate, but these AH725 inserts cut like butter in stainless. No burrs at all."
⭐⭐⭐⭐⭐ "Chipbreaker is a Life-Saver" - M. Berger, Germany
"The -B geometry really works. Usually, chips get tangled in internal threads, but these curl up and wash right out."
⭐⭐⭐⭐ "Made in Japan Reliability" - H. Suzuki, Japan
"Very high precision. We use it for medical titanium parts. The tool life is stable and predictable."
⭐⭐⭐⭐⭐ "Excellent B2B Partner" - F. Rossi, Italy
"Authentic Tungaloy stock. Shipping to Europe was fast. CNCHome-Beyond is our primary source for threading."
⭐⭐⭐⭐⭐ "Smooth Finish" - L. Tan, Singapore
"The Ra value of the threads is excellent. Gauge always fits perfectly on the first pass after setup."
8. FAQ - Threading Support
Q: Is AH725 better than AH120 for internal threading?
A: Yes. AH725 is a more modern PVD grade with higher edge toughness, making it superior for preventing chipping in fine threading applications.
Q: What is the benefit of the 'B' chipbreaker?
A: Internal threading often suffers from "bird-nesting" chips. The 'B' geometry breaks the chip into smaller, manageable pieces that are easily flushed out by coolant.
Q: Will this fit any SNR boring bar?
A: It fits any standard boring bar designed for 11IR (1/4" size) inserts. Check your shank diameter to ensure bore clearance.
Expert Insight: Precision Internal Threading
The 11IR05ISO-B is a partial profile-sensitive insert. To achieve the best results, use a modified flank infeed. This directs the cutting forces against the solid part of the boring bar, reducing chatter and ensuring the 0.5mm pitch thread is sharp and accurate. Trust the AH725 grade for consistency across high-volume production runs.
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