Tungaloy 16IR 3.0ISO-B AH725 Internal Threading Carbide Insert (10pcs)

Tungaloy 16IR 3.0ISO-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 3.0ISO-B AH725

Internal ISO Metric Specialist | 3.0mm Pitch | AH725 Nano-PVD Grade

Product Overview

The Tungaloy 16IR 3.0ISO-B AH725 is a heavy-duty internal threading insert engineered for large-diameter 3.0mm pitch ISO metric threads (standard for M24 and M27 coarse fasteners). This indexable carbide insert features the advanced AH725 PVD coated carbide grade, providing the extreme edge strength required for deep internal cuts in CNC machining. The specialized "-B" chipbreaker geometry is essential for internal threading at this pitch, as it aggressively curls chips in tight bore spaces to prevent surface scoring. Manufactured in Japan, this insert is the professional choice for precision machining in stainless steel, carbon steel, and high-temp alloys.

Technical Designation Breakdown

16
Size (IC)
I
Internal
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 Internal 8 TPI Internal Range

Pitch Selection Guidance: The 3.0ISO is a Full Profile insert. For large internal threading, this design is vital because it cuts the complete 60° thread form—crest, root, and flanks—simultaneously. This ensures the minor diameter of your bore is accurately formed to ISO standards, guaranteeing a high-strength fit for M24/M27 fasteners without manual root clearance adjustments.

Material: AH725 PVD High-Toughness Carbide

The AH725 grade is Tungaloy's premium choice for stainless steel turning and large-pitch threading. It features a micro-grain substrate that resists chipping under high loads, paired with a nano-multilayered PVD coating for extreme heat resistance. This long-tail keywords industry favorite ensures stable tool life even during the heavy material removal required for 3.0mm pitch internal threads.

-B Geometry: Aggressive Chipbreaker (槽型)

In large internal bores, chips are thick and dangerous. The -B chipbreaker geometry is specifically engineered to curl these heavy chips into small, manageable pieces that can be easily flushed out of the hole. This prevents "re-cutting" of chips and ensures a mirror-like finish during CNC machining.

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 3.0 pitch depth)

*Pro Tip: For internal 3.0mm pitch, use a modified flank infeed (27° - 29°) to reduce tool pressure and prevent chatter in long-overhang boring bars.*

Global Verified Reviews

⭐⭐⭐⭐⭐ "Standard for M24 production" - Stefan H., Germany
"Consistent 3.0mm results. The AH725 grade handles the depth of cut perfectly without chipping even in tough stainless."

⭐⭐⭐⭐⭐ "Great for deep bores" - Kenji T., Japan
"The -B chipbreaker is a must. No bird-nesting inside the parts. Original Tungaloy quality is unbeatable."

⭐⭐⭐⭐ "Tough in Alloy Steel" - Mike S., USA
"Very sharp and durable. The surface finish on large internal threads is mirror-like. Fits my SNR bars perfectly."

⭐⭐⭐⭐⭐ "High Accuracy" - Paolo G., Italy
"The full profile ensures M24 bolts fit perfectly every time. Fast shipping and genuine Japanese product."

⭐⭐⭐⭐⭐ "Reliable Tool Life" - Liam W., UK
"Predictable performance over hundreds of parts. Essential for our heavy machining contracts."

Technical Q&A

Q: Which boring bar does this fit?

A: It fits any standard **SNR** internal threading bar with a size 16 pocket (3/8" IC).

Q: Can I use this for external threads?

A: No. This is an **IR** (Internal Right) insert. For external work, you require the **ER** 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 internal threading, PVD grades like **AH725** are superior to CVD because they maintain a sharper cutting edge. This sharpness reduces cutting forces and vibration in boring bars, leading to superior accuracy and significantly longer tool life.

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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.