Tungaloy 16IR 16W-B AH725 Internal Whitworth Threading Carbide Insert (10pcs)

Tungaloy 16IR 16W-B AH725 Internal Whitworth 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 16W-B AH725

Internal 55° Whitworth Specialist | 16 TPI | AH725 Nano-PVD Grade

Product Overview

The Tungaloy 16IR 16W-B AH725 is a high-precision internal threading insert engineered for the 55° Whitworth thread standard (BSW/BSPP). With a pitch of 16 Threads Per Inch (TPI), it is the professional choice for 3/8" Whitworth internal fasteners and specialized pipe fittings. 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 bores to prevent surface scratching and tool damage. Made in Japan, this insert is the benchmark for precision machining in stainless steel, carbon steel, and heat-resistant alloys.

Technical Designation Breakdown

16
Size (IC)
I
Internal
R
Right Hand
16
Pitch (TPI)
W
Whitworth
B
Chipbreaker

Technical Specifications: Metric vs. Imperial

Technical Feature Imperial (Whitworth) Metric Equivalent
Thread Pitch 16 TPI 1.588 mm
Inscribed Circle (IC) 3/8 inch 9.525 mm
Thread Angle 55 Degrees N/A (Metric ISO is 60°)

Pitch Selection Guidance: The 16W is a Full Profile insert. For internal work, this is vital because it cuts the complete 55° thread form—crest, root, and flanks—simultaneously. This ensures the internal minor diameter is perfectly calibrated to Whitworth/BSW standards, guaranteeing precise fitment without manual root clearance adjustments.

Material: AH725 PVD Nano-Coating

The AH725 grade is Tungaloy's premium choice 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 stable tool life and exceptional surface quality in both continuous and interrupted internal cuts.

-B Geometry: Internal Chip Management (槽型)

Effective chip evacuation is vital for internal work where space is limited. The -B chipbreaker forces chips to curl tightly and snap into manageable lengths. This prevents "bird-nesting" inside the bore, ensuring the mirror-like precision machining results required for high-end components.

Recommended Cutting Parameters

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

  • Cutting Speed (Vc): 90 - 170 m/min (295 - 560 SFM)
  • Total Radial Depth: 1.02 mm
  • Number of Passes: 8 - 12 passes

*Pro Tip: For 16 TPI internal threading, use a modified flank infeed (27° to 29°) to reduce tool pressure and prevent chatter in long-overhang boring bars.*

Global Verified Reviews

⭐⭐⭐⭐⭐ "Perfect for 3/8 BSW" - Matthias H., Germany
"Consistent 16 TPI. The AH725 grade is incredibly tough and the finish on my stainless internal threads is mirror-like."

⭐⭐⭐⭐⭐ "Excellent Chip Control" - Kenji T., Japan
"The -B chipbreaker is a must for internal work. No more bird-nesting in my bores. Genuine Japanese quality."

⭐⭐⭐⭐ "Durable in Alloy Steel" - Dave S., USA
"High quality threads every time. Fits our SNR holders perfectly. Great for high-volume production."

⭐⭐⭐⭐⭐ "High Precision" - Luca V., Italy
"Surface finish is top-tier. Best price for authentic Tungaloy threading inserts. The 55-degree profile is spot on."

⭐⭐⭐⭐⭐ "Reliable Tool Life" - Liam F., Australia
"Predictable performance over hundreds of parts. Essential for our precision machining contracts."

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 use this for external threads?

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 specifically designed for stainless steel, Titanium, and Inconel.

Expert Machining Tip: Grade Advantage

For internal threading of 55° Whitworth profiles, PVD grades like **AH725** are superior to CVD because they maintain a sharper cutting edge. This sharpness is essential to properly form the rounded crests and roots without tearing the material, resulting in superior accuracy and 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.