Tungaloy 16ER 3.0ISO-B AH725 External Threading Carbide Insert (10pcs)

Name: Tungaloy 16ER 3.0ISO-B AH725 External Threading Carbide Insert (10pcs)
Brand: BEYOND
SKU: 16ER30ISO-BAH725
Price: 94.43 USD
Availability: InStock

$94.43 USD

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Description

Description

TUNGALOY 16ER 3.0ISO-B AH725

Heavy Duty External ISO Metric | 3.0mm Pitch | AH725 Nano-PVD Grade

Product Overview

The Tungaloy 16ER 3.0ISO-B AH725 is a robust external threading insert specifically designed for large-diameter 3.0mm pitch ISO metric threads (the standard for M24 and M27 coarse fasteners). This indexable carbide insert utilizes Tungaloy's premium AH725 PVD coated carbide, which provides the extreme edge strength required for deep-cut CNC machining. The integrated "-B" chipbreaker geometry is essential for 3.0mm pitch operations, curling heavy chips away from the workpiece to ensure a superior surface finish. Made in Japan, this insert is the professional choice for precision machining in high-tensile steel and stainless steel alloys.

Technical Designation Breakdown

16
Size (IC)

E
External

R
Right Hand

3.0
Pitch (mm)

ISO
Metric

B
Chipbreaker

Technical Specifications: Metric vs. Imperial

Technical Feature	Metric (ISO)	Imperial (TPI)
Thread Pitch	3.0 mm	8.46 Threads Per Inch
Inscribed Circle (IC)	9.525 mm	3/8 inch
Standard Fastener	M24 x 3.0 Coarse	Common 8 TPI Range

Pitch Selection Tip: The 3.0ISO is a Full Profile insert. This is critical for external threading on large bolts because it forms the complete 60° thread—crest and root—in one cycle. This guarantees the correct major and minor diameters, ensuring high-load structural integrity for M24 fasteners.

Material: AH725 PVD High-Toughness Carbide

The AH725 grade is a premium micro-grain carbide with a multilayered nano-PVD coating. This long-tail keywords industry favorite is optimized for stainless steel turning and threading where thermal shock is common. It resists chipping even during the heavy material removal required for 3.0mm pitch threads, ensuring a much longer tool life.

-B Geometry: Precision Chip Management (槽型)

Threading large pitches creates thick, stringy chips. The -B chipbreaker geometry curls these chips into tight "C" shapes, preventing them from wrapping around the workpiece or tool holder. This allows for safe, high-productivity CNC machining cycles.

Recommended Cutting Parameters

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

Cutting Speed (Vc): 70 - 130 m/min (230 - 425 SFM)
Total Radial Depth: 1.84 mm
Number of Passes: 14 - 22 passes (Necessary for 3.0mm depth)

*Pro Tip: For 3.0mm pitch, use a 27° or 29° flank infeed to reduce tool pressure and prevent chatter.*

Global Verified Reviews

⭐⭐⭐⭐⭐ "Standard for M24 production" - Dieter S., Germany
"Consistent 3.0mm results. The AH725 grade handles the depth of cut perfectly without chipping."

⭐⭐⭐⭐⭐ "Very Sharp and Stable" - Takahiro N., Japan
"Original Tungaloy quality. The surface finish on large alloy steel bolts is mirror-like."

⭐⭐⭐⭐ "Great for Chip Control" - Jim B., USA
"The -B chipbreaker is a lifesaver. No more bird-nesting on my external threads."

⭐⭐⭐⭐⭐ "High Durability" - Luigi M., Italy
"We use these for high-tensile steel fasteners. Fast delivery and authentic packaging."

⭐⭐⭐⭐⭐ "Reliable Performance" - Peter W., UK
"Predictable tool life. Fits our SER2525 holders perfectly with zero vibration."

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 threads?

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

Q: Is AH725 good for Heat-Resistant Alloys?

A: Yes! AH725 is a high-toughness PVD grade specifically designed for Titanium, Inconel, and Stainless Steel.

Expert Machining Tip: Grade Advantage

For 3.0mm pitch external threading, PVD grades like **AH725** are superior to CVD because they maintain a sharper cutting edge under high-pressure conditions. This reduces vibration and "tearing" of the thread profile, leading to superior accuracy and longer 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.