Tungaloy 16ER 1.75ISO-B AH725 External Threading Carbide Insert (10pcs)

Name: Tungaloy 16ER 1.75ISO-B AH725 External Threading Carbide Insert (10pcs)
Brand: BEYOND
SKU: 16ER1.75ISO-BAH725
Price: 94.43 USD
Availability: InStock

$94.43 USD

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Description

Description

TUNGALOY 16ER 1.75ISO-B AH725

External ISO Metric Specialist | 1.75mm Pitch | AH725 Nano-PVD Coating

Product Overview

The Tungaloy 16ER 1.75ISO-B AH725 is a high-performance external threading insert specifically engineered for 1.75mm pitch ISO metric threads (the standard for M12 coarse threading). Utilizing Tungaloy's premium AH725 PVD coated carbide, this indexable carbide insert offers an exceptional balance of wear resistance and edge toughness for CNC machining. The specialized "-B" chipbreaker geometry is designed to manage chip flow during external threading, preventing "bird-nesting" and ensuring a superior surface finish. Manufactured in Japan, this insert is the professional choice for precision machining in steel, stainless steel, and high-temp alloys.

Technical Designation Breakdown

16
Size (IC)

E
External

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)	9.525 mm	3/8 inch
Fastener Fit	M12 x 1.75 Coarse	Standard 14 TPI Gear

Pitch Selection Guidance: The 1.75ISO is a Full Profile insert. Unlike partial profile tools that require manual depth adjustments, this insert forms the complete 60° thread—crest and root—in one operation. This ensures the thread height is perfect every time, which is vital for the load-bearing integrity of M12 bolts.

Material: AH725 PVD High-Stability Carbide

The AH725 grade is Tungaloy's premium solution for stainless steel turning and threading. It features a micro-grain substrate that resists chipping, paired with a nano-multilayered PVD coating for extreme heat resistance. This long-tail keywords industry favorite ensures consistent tool life and high surface quality even when machining interrupted cuts or tough alloy steels.

-B Geometry: External Chip Control (槽型)

High-speed external threading often produces long, dangerous chips. The -B chipbreaker geometry is engineered to curl the chip tightly, breaking it into manageable pieces that fall away from the workpiece. This protects the thread flanks from scratching and allows for safer automated production.

Recommended Cutting Parameters

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

Cutting Speed (Vc): 80 - 160 m/min (260 - 520 SFM)
Total Radial Depth (ap): 1.07 mm
Number of Passes: 8 - 14 passes

*Pro Tip: For 1.75mm pitch threads, use a modified flank infeed (29°) to reduce tool pressure and prevent chatter.*

Global Verified Reviews

⭐⭐⭐⭐⭐ "Standard for our M12 bolts" - Yuri V., Germany
"Very stable and predictable tool life. The 1.75 pitch is spot on every time."

⭐⭐⭐⭐⭐ "Great toughness" - Kenji O., Japan
"AH725 handles interrupted cuts on alloy steel better than any other brand we've tried. Genuine quality."

⭐⭐⭐⭐ "Chips break perfectly" - Mark T., USA
"The -B chipbreaker really does make a difference in external work. Clean threads, no bird-nesting."

⭐⭐⭐⭐⭐ "Mirror Finish" - Luca B., Italy
"The surface quality on the thread flanks is incredible. Very happy with the purchase."

⭐⭐⭐⭐⭐ "Reliable Tooling" - Sarah L., UK
"Consistent results over hundreds of parts. Fits our SER 2020K16 holders perfectly."

Technical Q&A

Q: Which tool holder does this fit?

A: It fits all standard **SER** external threading holders with a size 16 pocket (3/8" IC), such as the **SER2020K16** or **SER2525M16**.

Q: Is AH725 good for Titanium?

A: Yes! AH725 is a high-toughness PVD grade designed for steel, stainless, and heat-resistant superalloys like Titanium.

Q: Can I use this for internal threading?

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

Expert Machining Tip: Grade Selection

For external threading, PVD grades like **AH725** are superior to CVD grades because they maintain a sharper cutting edge. This sharpness is essential to prevent "tearing" the thread profile in softer materials, 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.