Pillar 3 Spec — Carbide Inserts by ISO Code

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  "headline": "Carbide Inserts by ISO Code: CNMG TNMG DNMG WNMG APMT RPMT Reference",
  "description": "Complete ISO 1832 carbide insert reference. Decode CNMG, TNMG, DNMG, WNMG, APMT, RPMT, SPMG, WCMX and 16ER threading. Size charts, ANSI equivalents, and recommended applications for each code.",
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    {"@type": "Question", "name": "What does the CNMG 120408 designation mean?", "acceptedAnswer": {"@type": "Answer", "text": "CNMG 120408 follows ISO 1832 nomenclature: C = 80° rhombic shape, N = 0° clearance angle (negative insert), M = tolerance class (±0.08 mm on IC), G = hole + chipbreaker on both faces, 12 = 12.7 mm inscribed circle (IC), 04 = 4.76 mm thickness, 08 = 0.8 mm corner radius. This is the most common general-purpose turning insert globally."}},
    {"@type": "Question", "name": "How do ISO and ANSI designations convert?", "acceptedAnswer": {"@type": "Answer", "text": "ISO uses metric (millimeters), ANSI uses inches. CNMG 120408 (ISO) = CNMG 432 (ANSI), where 4 = 1/2\" IC (12.7 mm), 3 = 3/16\" thickness (4.76 mm), 2 = 1/32\" radius (0.8 mm). TNMG 160404 (ISO) = TNMG 331 (ANSI). Always verify holder compatibility — most modern holders accept both ISO and ANSI designations but check the spec sheet."}},
    {"@type": "Question", "name": "What is the difference between CNMG and CNMA inserts?", "acceptedAnswer": {"@type": "Answer", "text": "CNMG has a hole + chipbreaker (G = ground chipbreaker on both faces). CNMA has a hole but no chipbreaker (A = no chipbreaker, sharp edge). CNMA is used for heavy roughing where a sharp edge with maximum strength is needed. CNMG with PM/MM/GF chipbreakers is used for general-purpose turning across all operation phases."}},
    {"@type": "Question", "name": "What is the difference between APMT and APKT inserts?", "acceptedAnswer": {"@type": "Answer", "text": "APMT (M = tolerance ±0.05 mm, T = hole + chipbreaker on one face) is a parallelogram-shaped shoulder mill insert with positive rake. APKT (K = tolerance ±0.05 mm with thicker, T = hole + chipbreaker on one face) is a square 90° insert used for face milling. Both share similar sizes (1135/1604) but APMT is for shoulder/profile milling while APKT is for face milling."}},
    {"@type": "Question", "name": "Which is larger — CNMG 120408 or CNMG 160612?", "acceptedAnswer": {"@type": "Answer", "text": "CNMG 160612 is significantly larger. The 16 = 15.875 mm inscribed circle (vs 12.7 mm for 120408). The 06 = 6.35 mm thickness (vs 4.76 mm). The 12 = 1.2 mm corner radius (vs 0.8 mm). CNMG 160612 is for heavy roughing (ap 5-12 mm) on large shafts, while CNMG 120408 is the universal general-purpose size (ap 1-6 mm)."}},
    {"@type": "Question", "name": "What does the letter at the end of threading inserts (16ER AG60) mean?", "acceptedAnswer": {"@type": "Answer", "text": "16ER = 16mm IC external right-hand thread. The trailing code (AG60, AG55, etc.) indicates thread profile and pitch. AG60 = 60° partial profile (metric, UNC, UNF). AG55 = 55° partial profile (BSP, BSW). V-Cut profiles use specific codes: e.g., 16ER 1.0ISO = 1.0 mm pitch ISO metric. Always match the profile code to the thread standard being machined."}}
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3. Body Outline

1. Hero + TL;DR — ISO 1832 is the universal standard; ANSI is inch equivalent
2. ISO 1832 Decoding Table — letter positions 1-7 with their meaning
3. Letter 1: Shape (C / D / T / S / V / W / R / B / M)
4. Letter 2: Clearance angle (A / B / C / E / F / G / N / O / P)
5. Letter 3: Tolerance (A / F / C / H / E / G / J / K / L / M / N / U)
6. Letter 4: Hole + chipbreaker (A / G / M / N / Q / R / T / W / X)
7. Number 1: IC size (in mm × 10 for metric)
8. Number 2: Thickness (mm)
9. Number 3: Corner radius (mm × 100)
10. 10 Most Common Codes Deep Dive — CNMG 120408 / TNMG 160404 / DNMG 150608 / WNMG 080408 / APMT 1135 / APKT 1604 / RPMT 1204 / SPMG 050204 / WCMX 030208 / CCMT 060204
11. Threading Code Reference (16ER / 16IR / 11ER / 11IR)
12. Cross-Reference: ISO ↔ ANSI equivalents table
13. 6 FAQ accordion (matches JSON-LD)
14. 3 CTAs — WhatsApp / Browse Collection / Grade Cross-Reference

4. Internal Links

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<div class="p3-root">

<div class="p3-hero">
  <h1>Carbide Inserts by ISO Code: The Universal Reference</h1>
  <p>Decode every ISO 1832 carbide insert designation. CNMG, TNMG, DNMG, WNMG, APMT, RPMT, SPMG, WCMX, 16ER — understand the size, shape, tolerance, and application for each code. Field-tested reference for machinists, engineers, and procurement.</p>
</div>

<div class="p3-stat-grid">
  <div class="p3-stat"><div class="label">ISO Standard</div><div class="value">ISO 1832</div><div class="note">Universal metric designation</div></div>
  <div class="p3-stat"><div class="label">Insert Shapes</div><div class="value">7 main</div><div class="note">C / D / T / S / V / W / R</div></div>
  <div class="p3-stat"><label>Common ISO Codes</div><div class="value">30+</div><div class="note">Turn, mill, drill, thread, groove</div></div>
  <div class="p3-stat"><div class="label">Tolerance Classes</div><div class="value">13</div><div class="note">A / F / C / H / E / G / J / K / L / M / N / U</div></div>
  <div class="p3-stat"><div class="label">ANSI Equivalent</div><div class="value">Full</div><div class="note">Every ISO has inch equivalent</div></div>
</div>

<h2 class="p3-h2">ISO 1832 Designation Structure</h2>

<p>Every carbide insert designation follows a fixed 7-character pattern. Mastering this lets you decode any insert from any brand, anywhere in the world.</p>

<div class="p3-code-block">
<span>CNMG</span> 120408 -  <span>C</span>N<span>M</span><span>G</span> 12 04 08
<br>Shape Clearance Tolerance Features Thickness Radius
</div>

<p><strong>Examples:</strong> CNMG 120408 (workhorse turning), DNMG 150608 (heavy turning), WNMG 080408 (heavy roughing), APMT 1135 (shoulder milling).</p>

<h2 class="p3-h2">Letter-by-Letter Decoding Reference</h2>

<h3 class="p3-h3">Letter 1 — Insert Shape</h3>

<table class="p3-table">
  <thead><tr><th>Letter</th><th>Shape</th><th>Point Angle</th><th>Typical Use</th></tr></thead>
  <tbody>
    <tr><td>A</td><td>Parallelogram 85°</td><td>85°</td><td>Shoulder milling (APMT/APKT)</td></tr>
    <tr><td>B</td><td>Boring 5°-7° clearance</td><td>—</td><td>Internal boring</td></tr>
    <tr><td><strong>C</strong></td><td><strong>Rhombic 80°</strong></td><td><strong>80°</strong></td><td><strong>General turning (CNMG / CCMT) — most common</strong></td></tr>
    <tr><td>D</td><td>Rhombic 55°</td><td>55°</td><td>Profiling, slender shafts (DNMG / DCMT)</td></tr>
    <tr><td>E</td><td>Square 75°</td><td>75°</td><td>Turning (less common)</td></tr>
    <tr><tr>F</td><td>Square 50°</td><td>50°</td><td>Copy turning</td></tr>
    <tr><td>G</td><td>Rhombic 100°</td><td>100°</td><td>Copy turning</td></tr>
    <tr><td>M</td><td>Rhombic 86°</td><td>86°</td><td>Universal turning/milling</td></tr>
    <tr><td>N</td><td>No hole reference (used in negative-only)</td><td>—</td><td>See clearance letters</td></tr>
    <tr><td><strong>R</strong></td><td><strong>Round</strong></td><td>—</td><td><strong>Profiling, high-feed (RPMT 0802 / RDKT 1204)</strong></td></tr>
    <tr><td><strong>S</strong></td><td><strong>Square 90°</strong></td><td><strong>90°</strong></td><td><strong>Facing, heavy roughing (SNMG) — 8 cutting edges</strong></td></tr>
    <tr><td><strong>T</strong></td><td><strong>Triangle 60°</strong></td><td><strong>60°</strong></td><td><strong>General turning (TNMG / TCMT) — 6 cutting edges</strong></td></tr>
    <tr><td><strong>V</strong></td><td><strong>Rhombic 35°</strong></td><td><strong>35°</strong></td><td><strong>Precision profiling (VNMG / VCMT) — very low radial force</strong></td></tr>
    <tr><td>W</td><td>Trigon 80°</td><td>80°</td><td>Heavy roughing (WNMG) — 6 cutting edges</td></tr>
  </tbody>
</table>

<h3 class="p3-h3">Letter 2 — Clearance Angle</h3>

<table class="p3-table">
  <thead><tr><th>Letter</th><th>Clearance</th><th>Style</th></tr></thead>
  <tbody>
    <tr><td>A</td><td>3°</td><td>Negative (with hole)</td></tr>
    <tr><td>B</td><td>5°</td><td>Negative (with hole)</td></tr>
    <tr><td><strong>C</strong></td><td><strong>7°</strong></td><td><strong>Positive (with hole) — most common positive</strong></td></tr>
    <tr><td>E</td><td>20°</td><td>Positive (with hole)</td></tr>
    <tr><td>F</td><td>25°</td><td>Positive (with hole)</td></tr>
    <tr><td>G</td><td>30°</td><td>Positive (with hole)</td></tr>
    <tr><td>N</td><td>0°</td><td>Negative (no hole)</td></tr>
    <tr><td>O</td><td>30° (sharp edge, no chipbreaker)</td><td>Positive (no hole)</td></tr>
    <tr><td>P</td><td>11°</td><td>Positive (no hole)</td></tr>
  </tbody>
</table>

<h3 class="p3-h3">Letter 3 — Tolerance (IC ±mm / thickness ±mm)</h3>

<table class="p3-table">
  <thead><tr><th>Letter</th><th>IC ±mm</th><th>Thickness ±mm</th><th>Use</th></tr></thead>
  <tbody>
    <tr><td>A</td><td>±0.025</td><td>±0.025</td><td>Ultra-precision (rare)</td></tr>
    <tr><td>F</td><td>±0.013</td><td>±0.025</td><td>Precision ground (rare)</td></tr>
    <tr><td><strong>C</strong></td><td><strong>±0.025</strong></td><td><strong>±0.013</strong></td><td><strong>Precision turning (CCMT, TCMT precision ground)</strong></td></tr>
    <tr><td>H</td><td>±0.013</td><td>±0.025</td><td>Precision ground</td></tr>
    <tr><td>E</td><td>±0.025</td><td>±0.025</td><td>Standard turning precision</td></tr>
    <tr><td>G</td><td>±0.025</td><td>±0.025</td><td>Standard precision (CCMT general)</td></tr>
    <tr><td><strong>J</strong></td><td><strong>±0.05</strong></td><td><strong>±0.025</strong></td><td><strong>Standard turning (CNMG, TNMG, WNMG, DNMG)</strong></td></tr>
    <tr><td>K</td><td>±0.05</td><td>±0.025</td><td>Standard turning (older designation)</td></tr>
    <tr><td><strong>M</strong></td><td><strong>±0.08</strong></td><td><strong>±0.05</strong></td><td><strong>Standard turning (CNMG universal — most common)</strong></td></tr>
    <tr><td>N</td><td>±0.08</td><td>±0.025</td><td>Standard (older designation)</td></tr>
    <tr><td>U</td><td>±0.13</td><td>±0.08</td><td>Standard milling (APMT, APKT, RDKT)</td></tr>
  </tbody>
</table>

<h3 class="p3-h3">Letter 4 — Hole + Chipbreaker Features</h3>

<table class="p3-table">
  <thead><tr><th>Letter</th><th>Hole</th><th>Chipbreaker</th></tr></thead>
  <tbody>
    <tr><td>A</td><td>Yes</td><td>No (sharp edge)</td></tr>
    <tr><td><strong>G</strong></td><td><strong>Yes</strong></td><td><strong>Yes, on both faces (CNMG, TNMG, WNMG, DNMG, SNMG)</strong></td></tr>
    <tr><td>M</td><td>Yes</td><td>Yes, on one face (CCMT, DCMT, TCMT, VCMT — positive single-sided)</td></tr>
    <tr><td>N</td><td>No</td><td>No (CNMA, DNMA — sharp edge negative)</td></tr>
    <tr><td>Q</td><td>No</td><td>Yes, on both faces</td></tr>
    <tr><td>R</td><td>No</td><td>Yes, on one face</td></tr>
    <tr><td><strong>T</strong></td><td><strong>Yes</strong></td><td><strong>Yes, on one face (APMT / APKT — single-sided milling)</strong></td></tr>
    <tr><td>W</td><td>No</td><td>No (special geometry)</td></tr>
  </tbody>
</table>

<h3 class="p3-h3">Number 1 — Inscribed Circle (IC)</h3>

<p>Number 1 = IC in mm × 10. CNMG 12 = 12.7 mm IC. CNMG 16 = 15.875 mm IC. CNMG 19 = 19.05 mm IC. CNMG 25 = 25.4 mm IC.</p>

<h3 class="p3-h3">Number 2 — Thickness</h3>

<p>Number 2 = thickness in mm × 100. CNMG 04 = 4.76 mm thick. CNMG 06 = 6.35 mm thick. CNMG 07 = 7.94 mm thick.</p>

<h3 class="p3-h3">Number 3 — Corner Radius</h3>

<p>Number 3 = radius in mm × 100. CNMG 08 = 0.8 mm radius. CNMG 12 = 1.2 mm radius. CNMG 04 = 0.4 mm radius (finishing).</p>

<h2 class="p3-h2">10 Most Common ISO Codes — Deep Dive</h2>

<h3 class="p3-h3">1. CNMG 120408 — The Workhorse</h3>
<p>Universal general-purpose turning insert. 80° rhombic, 12.7 mm IC, 0.8 mm radius. Used for steel roughing, medium, finishing across all brands. Available in every grade (US7020, GC4325, YBC151, VP15TF, NC3225, etc.). Available in every chipbreaker (PM, MM, MF, GF, PMR, etc.).</p>
<p>Browse: <a href="/collections/negative-turning-insert-mitsubishi" class="p3-link">Mitsubishi CNMG 120408</a></p>

<h3 class="p3-h3">2. TNMG 160404 — Heavy Workhorse</h3>
<p>Triangle 60°, 9.525 mm IC, 0.4 mm radius. 6 cutting edges. The most economical insert for medium turning on smaller lathes.</p>
<p>Browse: <a href="/collections/positive-turning-insert-mitsubishi" class="p3-link">Mitsubishi TNMG 160404</a></p>

<h3 class="p3-h3">3. DNMG 150608 — Profiling Standard</h3>
<p>Rhombic 55°, 12.7 mm IC, 0.8 mm radius. 4 cutting edges. The profiling standard for low radial-force cuts on slender workpieces.</p>

<h3 class="p3-h3">4. WNMG 080408 — Heavy Roughing</h3>
<p>Trigon 80°, 12.7 mm IC, 0.8 mm radius. 6 cutting edges. Strongest negative geometry for steel roughing with low cutting force per edge.</p>

<h3 class="p3-h3">5. APMT 1135 — Shoulder Milling Standard</h3>
<p>Parallelogram 85°, 6.35 mm IC, 3.5 mm thickness, 0.4 mm radius. Single-sided positive. The workhorse shoulder mill insert for steel and stainless.</p>

<h3 class="p3-h3">6. APKT 1604 PDR — Face Milling</h3>
<p>Square 90°, 9.525 mm IC, 4.76 mm thickness, 0.4 mm radius. Face milling standard. PDR chipbreaker is high-feed positive rake.</p>

<h3 class="p3-h3">7. RPMT 1204-MO — High-Feed Milling</h3>
<p>Round 12 mm IC, 4.76 mm thickness, 0.8 mm radius. High-feed milling specialist. MO chipbreaker = aggressive feed up to 1.5 mm/tooth.</p>

<h3 class="p3-h3">8. SPMG 050204 — U-Drill Standard</h3>
<p>Square 5 mm IC, 2.78 mm thickness, 0.4 mm radius. Indexable U-drill (Mitsubishi MWS, Sandvik CoroDrill 880). 20-25 mm drill diameter range.</p>
<p>Browse: <a href="/collections/taegutec-drill-inserts" class="p3-link">TaeguTec drill inserts</a></p>

<h3 class="p3-h3">9. WCMX 030208 — U-Drill Stainless Standard</h3>
<p>Trigon 3.97 mm IC, 2.38 mm thickness, 0.8 mm radius. Stainless-steel U-drill specialist. 22-30 mm drill range.</p>

<h3 class="p3-h3">10. CCMT 060204 — Precision Finishing</h3>
<p>Rhombic 80° positive, 6.35 mm IC, 0.4 mm radius. Swiss-type lathe and precision finishing standard.</p>

<h2 class="p3-h2">Threading Code Reference (16ER / 16IR / 11ER / 11IR)</h2>

<table class="p3-table">
  <thead><tr><th>Code</th><th>Meaning</th></tr></thead>
  <tbody>
    <tr><td>16ER AG60</td><td>16mm IC, external right-hand, 60° partial profile (metric/UNC/UNF)</td></tr>
    <tr><td>16ER AG55</td><td>16mm IC, external right-hand, 55° partial profile (BSP/BSW)</td></tr>
    <tr><td>16IR AG60</td><td>16mm IC, internal right-hand, 60° partial profile</td></tr>
    <tr><td>16ER 1.0ISO</td><td>16mm IC, external, 1.0 mm pitch ISO metric full profile</td></tr>
    <tr><td>16ER 1.5ISO</td><td>16mm IC, external, 1.5 mm pitch ISO metric full profile</td></tr>
    <tr><td>11ER AG60</td><td>11mm IC, external right-hand, fine pitch 0.5-1.5 mm range</td></tr>
  </tbody>
</table>

<h2 class="p3-h2">ISO ↔ ANSI Cross-Reference Table</h2>

<table class="p3-table">
  <thead><tr><th>ISO (metric)</th><th>ANSI (inch)</th><th>IC (mm)</th><th>Thickness (mm)</th><th>Common Use</th></tr></thead>
  <tbody>
    <tr><td>CNMG 120404</td><td>CNMG 431</td><td>12.7</td><td>4.76</td><td>Light/medium turning</td></tr>
    <tr><td><strong>CNMG 120408</strong></td><td><strong>CNMG 432</strong></td><td><strong>12.7</strong></td><td><strong>4.76</strong></td><td><strong>Universal turning (workhorse)</strong></td></tr>
    <tr><td>CNMG 120412</td><td>CNMG 433</td><td>12.7</td><td>4.76</td><td>Heavy roughing</td></tr>
    <tr><td>CNMG 160612</td><td>CNMG 642</td><td>15.875</td><td>6.35</td><td>Heavy roughing on large shafts</td></tr>
    <tr><td>CNMG 190612</td><td>CNMG 643</td><td>19.05</td><td>6.35</td><td>Heavy roughing on very large parts</td></tr>
    <tr><td>TNMG 160404</td><td>TNMG 331</td><td>9.525</td><td>4.76</td><td>Universal medium turning</td></tr>
    <tr><td>TNMG 160408</td><td>TNMG 332</td><td>9.525</td><td>4.76</td><td>Universal medium turning (workhorse)</td></tr>
    <tr><td>DNMG 150608</td><td>DNMG 542</td><td>12.7</td><td>6.35</td><td>Profiling, low radial force</td></tr>
    <tr><td>WNMG 080408</td><td>WNMG 432</td><td>12.7</td><td>4.76</td><td>Heavy roughing, 6 edges</td></tr>
    <tr><td>SNMG 120408</td><td>SNMG 432</td><td>12.7</td><td>4.76</td><td>Facing, 8 edges (most economical)</td></tr>
    <tr><td>APMT 1135-PDER</td><td>(metric only)</td><td>6.35</td><td>3.5</td><td>Shoulder milling standard</td></tr>
    <tr><td>APKT 1604-PDR</td><td>(metric only)</td><td>9.525</td><td>4.76</td><td>Face milling standard</td></tr>
  </tbody>
</table>

<div class="p3-callout p3-callout-info">
  <strong>💡 Why ISO vs ANSI Matters</strong>
  Modern tool holders accept both ISO and ANSI designations. The numbers convert: ISO 12 = ANSI 4 (½"), ISO 04 = ANSI 3 (3/16"), ISO 08 = ANSI 2 (1/32"). When ordering, just specify either system — but make sure your tool holder matches. Most cnchome-beyond product descriptions list both ISO and ANSI in the title.
</div>

<h2 class="p3-h2">Frequently Asked Questions</h2>

<details class="p3-details">
  <summary>What does the CNMG 120408 designation mean?</summary>
  <p>CNMG 120408 follows ISO 1832 nomenclature: C = 80° rhombic shape, N = 0° clearance angle (negative insert), M = tolerance class (±0.08 mm on IC), G = hole + chipbreaker on both faces, 12 = 12.7 mm inscribed circle (IC), 04 = 4.76 mm thickness, 08 = 0.8 mm corner radius. This is the most common general-purpose turning insert globally.</p>
</details>

<details class="p3-details">
  <summary>How do ISO and ANSI designations convert?</summary>
  <p>ISO uses metric (millimeters), ANSI uses inches. CNMG 120408 (ISO) = CNMG 432 (ANSI), where 4 = 1/2" IC (12.7 mm), 3 = 3/16" thickness (4.76 mm), 2 = 1/32" radius (0.8 mm). TNMG 160404 (ISO) = TNMG 331 (ANSI). Always verify holder compatibility — most modern holders accept both ISO and ANSI designations but check the spec sheet.</p>
</details>

<details class="p3-details">
  <summary>What is the difference between CNMG and CNMA inserts?</summary>
  <p>CNMG has a hole + chipbreaker (G = ground chipbreaker on both faces). CNMA has a hole but no chipbreaker (A = no chipbreaker, sharp edge). CNMA is used for heavy roughing where a sharp edge with maximum strength is needed. CNMG with PM/MM/GF chipbreakers is used for general-purpose turning across all operation phases.</p>
</details>

<details class="p3-details">
  <summary>What is the difference between APMT and APKT inserts?</summary>
  <p>APMT (M = tolerance ±0.05 mm, T = hole + chipbreaker on one face) is a parallelogram-shaped shoulder mill insert with positive rake. APKT (K = tolerance ±0.05 mm with thicker, T = hole + chipbreaker on one face) is a square 90° insert used for face milling. Both share similar sizes (1135/1604) but APMT is for shoulder/profile milling while APKT is for face milling.</p>
</details>

<details class="p3-details">
  <summary>Which is larger — CNMG 120408 or CNMG 160612?</summary>
  <p>CNMG 160612 is significantly larger. The 16 = 15.875 mm inscribed circle (vs 12.7 mm for 120408). The 06 = 6.35 mm thickness (vs 4.76 mm). The 12 = 1.2 mm corner radius (vs 0.8 mm). CNMG 160612 is for heavy roughing (ap 5-12 mm) on large shafts, while CNMG 120408 is the universal general-purpose size (ap 1-6 mm).</p>
</details>

<details class="p3-details">
  <summary>What does the letter at the end of threading inserts (16ER AG60) mean?</summary>
  <p>16ER = 16mm IC external right-hand thread. The trailing code (AG60, AG55, etc.) indicates thread profile and pitch. AG60 = 60° partial profile (metric, UNC, UNF). AG55 = 55° partial profile (BSP, BSW). V-Cut profiles use specific codes: e.g., 16ER 1.0ISO = 1.0 mm pitch ISO metric. Always match the profile code to the thread standard being machined.</p>
</details>

<h2 class="p3-h2">Talk to a Tooling Engineer</h2>

<p>Not sure which ISO code fits your operation? Send us your operation type, workpiece material, and machine specs. Our engineering team responds within one business day with the correct insert code + grade + cutting parameters.</p>

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• Fill SEO 5 fields from Section 1
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