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

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

$94.43 USD

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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

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.