TUNGALOY 16ER 11W-B AH725
External 55° Whitworth Specialist | 11 TPI | AH725 Nano-PVD Grade
Product Overview
The Tungaloy 16ER 11W-B AH725 is a premium external threading insert designed for the 55° Whitworth thread standard. With a pitch of 11 Threads Per Inch (TPI), it is the go-to solution for G-series (BSPP) pipe threads ranging from 5/8" to 7/8". This indexable carbide insert utilizes Tungaloy's world-class AH725 PVD coated carbide, providing the exceptional toughness needed for CNC machining of high-tensile steels and stainless steel. The integrated "-B" chipbreaker geometry ensures superior chip control, preventing the long stringy chips typically associated with pipe threading, thereby protecting your workpiece and enhancing tool life. Made in Japan, this insert is the benchmark for precision machining in plumbing, hydraulic, and oil & gas applications.
Technical Designation Breakdown
16
Size (IC)
E
External
R
Right Hand
11
Pitch (TPI)
W
Whitworth
B
Chipbreaker
Understanding the 11W Pitch Selection
The 11W designation refers to 11 threads per inch under the Whitworth (BSW/BSPP) standard, which features a 55-degree included angle and rounded crests/roots. This is a Full Profile insert, meaning it cuts the entire thread form in one cycle. This guarantees that your pipe fittings will meet pressure-tight requirements without needing secondary adjustments to the major diameter.
| Feature |
Imperial (Whitworth) |
Metric Equivalent |
| Thread Pitch |
11 TPI |
2.309 mm |
| Thread Angle |
55 Degrees |
N/A (Metric is 60°) |
| Standard Sizes |
G 5/8", G 3/4", G 7/8" |
~16mm to 22mm BSW |
Material: AH725 High-Performance Carbide
The AH725 grade is a specialized PVD-coated micro-grain carbide. This long-tail keywords industry favorite is designed for versatility. It provides a sharp cutting edge for stainless steel turning while maintaining the structural integrity required for heavy carbon steel threading. Its high resistance to thermal cracking makes it ideal for precision machining with or without coolant.
-B Geometry: Precision Chip Management (槽型)
Pipe threading often produces continuous chips that can wrap around the tool. The -B chipbreaker geometry forces the chip to curl and break into small "C" shapes. This is critical for automated CNC machining, as it allows for unmanned operation and prevents surface damage to the threads.
Recommended Cutting Parameters
Optimized for P (Steel) and M (Stainless Steel):
-
Cutting Speed (Vc): 80 - 160 m/min (260 - 525 SFM)
-
Total Radial Depth: 1.48 mm
-
Number of Passes: 10 - 18 passes
*Pro Tip: For 11 TPI, use a radial infeed or a slightly modified flank infeed (27°) for the best balance between surface finish and tool life.*
Global Verified Reviews
⭐⭐⭐⭐⭐ "Perfect for BSPP pipe fittings" - George H., UK
"Consistent 11 TPI threads. The AH725 grade is incredibly tough when working with 316 stainless."
⭐⭐⭐⭐⭐ "Best chip control I've seen" - Takahiro M., Japan
"The -B chipbreaker saves me a lot of time. No more bird-nesting on the lathe. Genuine Tungaloy quality."
⭐⭐⭐⭐ "Durable and Sharp" - Frank S., USA
"Used these for a large run of 3/4" BSW bolts. The finish was perfect even after 100 parts. Fits my SER holder perfectly."
⭐⭐⭐⭐⭐ "High Accuracy" - Marco B., Italy
"Full profile is the only way to go for pipe threads. Guaranteed tight fit every time. Fast shipping too."
⭐⭐⭐⭐⭐ "Reliable Tool Life" - Liam O., Australia
"Very predictable wear. Great for CNC production. These inserts handle the high pressures of 11 TPI threading easily."
Technical Q&A
Q: Which tool holder does this insert fit?
A: It fits any external threading holder with a size 16 (3/8" IC) pocket, such as the **SER2020K16** or **SER2525M16**.
Q: Can I use this for internal pipe threads?
A: No. This is an **ER** (External Right) insert. For internal Whitworth threads, you need the **16IR 11W** series.
Q: Is AH725 better than AH710 for stainless steel?
A: AH725 is generally more versatile and offers better toughness for interrupted cuts or varying stainless grades.
Expert Machining Tip: Grade Advantage
For external threading of Whitworth profiles, PVD grades like **AH725** are superior to CVD because they maintain a sharper cutting edge. This sharpness is essential to properly form the rounded crests and roots of the 55° profile, reducing "tearing" and improving tool life.
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