Tungaloy 16IR 2.5ISO-B AH725 Internal Threading Carbide Insert (10pcs)

Tungaloy 16IR 2.5ISO-B AH725 Internal Threading Carbide Insert (10pcs)

$94.43 USD

✓ In Stock & Fast Dispatch: Order processing: typically 1–3 business days after confirmation.
✓ Global Shipping: Delivery: generally 5–20 business days, depending on destination and shipping method.
✓ Guaranteed Quality: Check model, dimensions and compatibility before ordering. | Direct Factory Outlet
✓ Technical Support: Need grade selection help? Contact Engineer

💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF

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Description

TUNGALOY 16IR 2.5ISO-B AH725

Internal ISO Metric Specialist | 2.5mm Pitch | AH725 Nano-PVD Grade

Product Overview

The Tungaloy 16IR 2.5ISO-B AH725 is a heavy-duty internal threading insert engineered for 2.5mm pitch ISO metric threads, commonly used for M18, M20, and M22 internal fasteners. This indexable carbide insert features the advanced AH725 PVD coated carbide grade, providing superior edge toughness and wear resistance for demanding CNC machining. The specialized "-B" chipbreaker geometry is essential for internal threading, forcing chips to curl tightly in confined spaces to prevent surface scratching and tool damage. Made in Japan, this insert is the professional choice for precision machining in stainless steel, carbon steel, and heat-resistant alloys.

Technical Designation Breakdown

16
Size (IC)
I
Internal
R
Right Hand
2.5
Pitch (mm)
ISO
Standard
B
Chipbreaker

Technical Specifications: Metric vs. Imperial

Technical Feature Metric (ISO) Imperial (TPI)
Thread Pitch 2.5 mm 10.16 Threads Per Inch
Inscribed Circle (IC) 9.525 mm 3/8 inch
Standard Fastener M18 - M22 Internal 10 TPI Coarse Threads

Pitch Selection Guidance: The 2.5ISO is a Full Profile insert. This ensures the insert forms the complete thread profile—crest, root, and flank—in one cycle. This is critical for internal threading, as it guarantees the correct minor diameter and profile geometry within the bore, ensuring a perfect fit with matching bolts without needing secondary deburring.

Material: AH725 PVD Nano-Coating

The AH725 grade is Tungaloy's premium choice for stainless steel turning and threading. It features a micro-grain carbide substrate with a multilayered PVD coating. This long-tail keywords industry favorite provides exceptional resistance to notch wear and thermal cracking, resulting in significantly extended tool life in tough machining environments.

-B Geometry: Internal Chip Control (槽型)

Efficient chip evacuation is vital for internal work where space is limited. The -B chipbreaker forces chips to curl tightly, breaking them into manageable lengths that can be easily flushed out of the bore. This prevents "bird-nesting" and ensures the mirror-like surface finish required in precision machining.

Recommended Cutting Parameters

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

  • Cutting Speed (Vc): 70 - 140 m/min (230 - 460 SFM)
  • Total Radial Depth: 1.53 mm
  • Number of Passes: 12 - 18 passes (Recommended for 2.5 pitch depth)

*Pro Tip: For 2.5mm internal pitches, use a modified flank infeed (27° to 29°) to reduce tool pressure and prevent chatter in boring bars.*

Global Verified Reviews

⭐⭐⭐⭐⭐ "Perfect for M20 production" - Matthias B., Germany
"The 2.5 pitch is spot on. Very stable in stainless steel bores. Excellent Japanese quality."

⭐⭐⭐⭐⭐ "Great Chip Evacuation" - Yuki S., Japan
"The -B chipbreaker is a must for internal threads. No more bird-nesting in my deep bores. Highly recommend AH725."

⭐⭐⭐⭐ "Tough in Alloy Steel" - James R., USA
"Solid performance on 4140. Tool life is predictable and the finish is very clean. Fits my SNR bar perfectly."

⭐⭐⭐⭐⭐ "Mirror Finish" - Paolo C., Italy
"The thread flanks are very smooth. Authentic Tungaloy inserts make a huge difference in precision work."

⭐⭐⭐⭐⭐ "Best Wholesale Value" - Alexander G., UK
"Fast shipping and genuine products. These inserts last much longer than generic versions on the market."

Technical Q&A

Q: Which boring bar does this fit?

A: This fits all standard **SNR** internal threading bars with a 16-size (3/8" IC) pocket.

Q: Can I cut external threads with this?

A: No. This is a **16IR** (Internal Right-hand). For external work, you require the **16ER** series.

Q: Is AH725 suitable for Titanium alloys?

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

Expert Machining Tip: Grade Selection

For internal threading, PVD grades like **AH725** are superior to CVD grades because they maintain a sharper cutting edge. This sharpness is essential to reduce cutting pressure and vibration in boring bars, leading to much better tool life and thread accuracy.

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Technical FAQ & Buying Guide

How do I choose the correct specification?

When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.

How can I check compatibility with my existing setup?

For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.

What quantity and price unit am I ordering?

Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.

How should I choose cutting parameters?

Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.

Are bulk discounts available?

Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.

When will my order ship and arrive?

According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.