Tungaloy 16ER 1.25ISO-B AH725 External Threading Carbide Insert (10pcs) - BEYOND

Tungaloy 16ER 1.25ISO-B AH725 External Threading Carbide Insert (10pcs)

$94.43 USD

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

american expressmasterpaypalvisaapple paygoogle payshopify pay
Order in the next [totalHours] hours %M minutes to get it between and
Description

TUNGALOY 16ER 1.25ISO-B AH725

External ISO Metric Specialist | 1.25mm Pitch | AH725 Nano-PVD Coating

Product Overview

The Tungaloy 16ER 1.25ISO-B AH725 is a high-precision external threading insert engineered for 1.25mm pitch ISO metric threads, the standard for M8 and M9 fasteners. This indexable carbide insert utilizes the world-renowned AH725 PVD coated carbide grade, providing the edge toughness and thermal stability required for intensive CNC machining of stainless steel, carbon steel, and high-temp alloys. The "-B" chipbreaker is a specialized feature that ensures tight chip curling, preventing surface damage and ensuring a mirror-like finish. Made in Japan, this insert is the gold standard for precision machining in automotive and aerospace applications.

Technical Designation Breakdown

16
Size (IC)
E
External
R
Right Hand
1.25
Pitch (mm)
ISO
Metric
B
Chipbreaker

Technical Specifications: Metric vs. Imperial

Feature Metric (ISO) Imperial (TPI)
Thread Pitch 1.25 mm 20.32 Threads Per Inch
Inscribed Circle (IC) 9.525 mm 3/8 inch
Standard Fastener M8 x 1.25 Coarse Equivalent to 20 TPI

Pitch Selection Tip: The 1.25ISO is a "Full Profile" insert. It trims the crest of the thread precisely while cutting the root, ensuring the finished external threading meets exact ISO tolerances. This eliminates the need for post-machining deburring or diameter sizing.

Grade: AH725 PVD Nano-Coated Carbide

The AH725 grade is a premium PVD coated micro-grain carbide. This long-tail keywords industry favorite is designed for stainless steel turning and threading. Its smooth coating prevents the built-up edge (BUE) often seen in gummy materials, drastically increasing tool life and maintaining sharp cutting edges for thousands of passes.

-B Geometry: Precision Chipbreaker (槽型)

In external threading, chip control is vital for operator safety and surface finish. The -B chipbreaker geometry curls chips away from the tool post and workpiece, preventing the "bird-nesting" effect that can ruin high-value components.

Recommended Cutting Parameters

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

  • Cutting Speed (Vc): 80 - 180 m/min (260 - 590 SFM)
  • Total Radial Depth: 0.77 mm
  • Number of Passes: 6 - 12 passes (Standard for 1.25 pitch)

*Pro Tip: For 1.25mm pitch, use a constant volume infeed method for the most consistent tool wear results.*

Global Verified Reviews

⭐⭐⭐⭐⭐ "Perfect for M8 fasteners" - Hans W., Germany
"Very stable and sharp. The AH725 grade handles 304 stainless steel with zero chipping."

⭐⭐⭐⭐⭐ "Best Surface Finish" - Yuki M., Japan
"Thread quality is mirror-like. Tungaloy original quality is worth every penny for production jobs."

⭐⭐⭐⭐ "Great Chip Evacuation" - David R., USA
"The -B chipbreaker works wonders. No more stringy chips wrapping around the spindle."

⭐⭐⭐⭐⭐ "Highly Recommend" - Marco S., Italy
"Consistent results. Fast shipping and the inserts were clearly genuine and well-packaged."

⭐⭐⭐⭐⭐ "Solid Performance" - Arthur L., UK
"Using these for high-tensile steel bolts. They hold up much better than the standard non-chipbreaker versions."

Technical Q&A

Q: Which tool holder does this insert fit?

A: It fits all standard **SER** external threading holders with a size 16 pocket, such as the **SER2020K16** or **SER2525M16**.

Q: Is this suitable for heat-resistant alloys?

A: Yes. The **AH725** grade is specifically designed for Titanium, Inconel, and various types of Stainless Steel.

Q: Can I use this for internal threading?

A: No. This is an **ER** (External Right-hand) insert. For internal threads, you would need the **IR** series.

Expert Machining Tip: Material Comparison

For external threading, PVD grades like **AH725** are preferred for their ability to maintain a sharp edge under high-speed conditions. This prevents "tearing" of the thread profile in softer materials while providing the hardness needed for high-strength alloys, leading to superior tool life.

© Technical Content by cnchome-beyond.com - Scraping Protection Active

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.