ANSI ↔ ISO Insert Code Converter

Convert between ANSI B212 (US standard, used by Mitsubishi US / Kennametal / Iscar) and ISO 1832 (international). Enter any insert code — get the exact equivalent, dimensions, and brand cross-reference.

🔄 Bidirectional 📏 ANSI B212 + ISO 1832 🔧 7 Shapes × 6 Sizes 🏭 Mitsubishi / Kennametal / Iscar ⚡ Instant

Convert ANSI to ISO 1832

Enter an ANSI B212 designation (e.g., CNMG 432 or CNMG-432-MV). We convert the size digits and identify the chipbreaker.

ISO 1832 Equivalent
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Dimensions (mm)
IC (Inscribed Circle)
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Thickness
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Corner Radius
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Hole
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Convert ISO 1832 to ANSI B212

Enter an ISO designation (e.g., CNMG 120408). We convert metric mm to ANSI digit format.

ANSI B212 Equivalent
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Dimensions (mm)
IC (Inscribed Circle)
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Thickness
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Corner Radius
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Hole
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Common ANSI ↔ ISO Equivalents

Reference table for the 30 most common insert designations. Use Tab 1 or Tab 2 for other sizes or chipbreakers.

ANSI (US) ISO IC (mm) Thickness (mm) Shape
CNMA 431 CNMA 120404 12.7 4.76 80° rhombic, no chipbreaker
CNMA 432 CNMA 120408 12.7 4.76 80° rhombic, no chipbreaker
CNMA 433 CNMA 120412 12.7 4.76 80° rhombic, no chipbreaker
CNMA 543 CNMA 160608 15.875 6.35 80° rhombic, no chipbreaker
CNMG 431 CNMG 120404 12.7 4.76 80° rhombic + chipbreaker
CNMG 432 CNMG 120408 12.7 4.76 80° rhombic + chipbreaker (most common)
CNMG 433 CNMG 120412 12.7 4.76 80° rhombic + chipbreaker
CNMG 542 CNMG 160608 15.875 6.35 80° rhombic + chipbreaker
CNMG 543 CNMG 160612 15.875 6.35 80° rhombic + chipbreaker
CNMM 432 CNMM 120408 12.7 4.76 80° rhombic, heavy
DNMA 432 DNMA 150408 12.7 4.76 55° rhombic, no chipbreaker
DNMG 432 DNMG 150408 12.7 4.76 55° rhombic + chipbreaker (high feed)
DNMG 433 DNMG 150412 12.7 4.76 55° rhombic + chipbreaker
DNMG 442 DNMG 150608 12.7 6.35 55° rhombic + chipbreaker
TNMA 332 TNMA 160408 9.525 4.76 60° triangle, no chipbreaker
TNMA 333 TNMA 160412 9.525 4.76 60° triangle, no chipbreaker
TNMG 331 TNMG 160404 9.525 4.76 60° triangle + chipbreaker
TNMG 332 TNMG 160408 9.525 4.76 60° triangle + chipbreaker (most common)
TNMG 333 TNMG 160412 9.525 4.76 60° triangle + chipbreaker
VNMA 332 VNMA 160408 9.525 4.76 35° rhombic, no chipbreaker
VNMG 332 VNMG 160408 9.525 4.76 35° rhombic + chipbreaker
SNMA 432 SNMA 120408 12.7 4.76 90° square, no chipbreaker
SNMG 432 SNMG 120408 12.7 4.76 90° square + chipbreaker
WNMA 432 WNMA 080408 12.7 4.76 80° trigon, no chipbreaker
WNMG 432 WNMG 080408 12.7 4.76 80° trigon + chipbreaker (multi-edge)
CCMT 432 CCMT 120408 12.7 4.76 80° positive + chipbreaker
CCMT 433 CCMT 120412 12.7 4.76 80° positive + chipbreaker
DCMT 432 DCMT 150408 12.7 4.76 55° positive + chipbreaker
TCMT 332 TCMT 160408 9.525 4.76 60° positive + chipbreaker
🔧 Need Mitsubishi US / Kennametal / Iscar equivalent?
OYYU stocks 192 ISO 5608 holders and 18+ insert grades. We can source Mitsubishi US, Kennametal KC, and Iscar equivalents for any CNMG/DNMG/TNMG you specify. Reply within 24 hours.
📧 Request Cross-Reference

ANSI B212 vs ISO 1832: What's the Difference?

Both ANSI B212 (USA) and ISO 1832 (international) describe the same physical inserts, but they use different digit formats for the three key dimensions:

  • ANSI B212 uses 3-digit inch fractions:
    • IC digit = N/8 inch (e.g., 4 = 1/2" = 12.7mm)
    • Thickness digit = N/16 inch (e.g., 3 = 3/16" = 4.76mm)
    • Corner digit = N/64 inch (e.g., 2 = 2/64" = 0.794mm)
  • ISO 1832 uses 2-digit mm:
    • IC: 06 = 6.35mm, 09 = 9.525mm, 12 = 12.7mm, 16 = 15.875mm, 19 = 19.05mm, 22 = 22.225mm
    • Thickness: 03 = 3.18mm, 04 = 4.76mm, 06 = 6.35mm
    • Corner: 04 = 0.4mm, 08 = 0.8mm, 12 = 1.2mm, 16 = 1.6mm

Both systems have the same shape letters (C/D/T/V/W/S/R) and the same rake letters (N for negative, C/G for positive). The chipbreaker letter (G, M, R, F) is also a 1:1 match for most brands.

Conversion Cheat Sheet

ANSI digit IC (mm) Thickness (mm) Corner R (mm)
1 3.175 1.59 0.40
2 6.35 3.18 0.79
3 9.525 4.76 1.19
4 12.7 6.35 1.59
5 15.875 7.94 1.98
6 19.05 9.525 2.38
7 22.225 11.11 —
8 25.4 — —

Common Conversion Mistakes

  1. Confusing IC digit vs thickness digit. ANSI 432 = IC 4 (1/2"), thick 3 (3/16"), corner 2 (1/32"). A common mistake: thinking 432 means 4/32, 3/16, 2/8 — totally wrong.
  2. ISO corner is 1/100 mm, ANSI corner is 1/64 inch. ISO 08 = 0.8mm, ANSI 2 = 0.794mm. Almost identical, but not exactly.
  3. Positive vs negative insert has same size code. CCMT 432 (positive) and CNMG 432 (negative) have the same IC/thickness/corner. The letter difference (C vs N) is the rake, not the size.
  4. ANSI chipbreaker is sometimes a different letter. Generic "G" usually maps to ISO "G". But Mitsubishi US uses MV/MU/RP, Kennametal uses CP/KC/GC. Always check the brand catalog.

Brand Cross-Reference (Common Chipbreakers)

Brand Generic ISO Brand Chipbreaker Application
Mitsubishi (JP) MF / MM / MR FH / MV / MU / RP / GH Finishing → Heavy roughing
Mitsubishi US MF / MM / MR MV / MU / RP Same as JP, US-stocked
Kennametal MF / MM / MR CP / GC / KC / MP / RP Finishing → Heavy roughing
Iscar MF / MM / MR IC / ICK / ICN / IF Finishing → Heavy roughing
Sandvik MF / MM / MR QF / QM / QR / MF Finishing → Heavy roughing
Walter MF / MM / MR FM / MM / MR / RP Finishing → Heavy roughing
Seco MF / MM / MR FF1 / M3 / R4 / R5 Finishing → Heavy roughing
Sumitomo MF / MM / MR EF / EM / EX / EU / UP Finishing → Heavy roughing
Korloy MF / MM / MR HQ / MP / MA / MG Finishing → Heavy roughing
Tungaloy MF / MM / MR SF / SM / SR / S25 / T15 Finishing → Heavy roughing

Frequently Asked Questions

What is CNMG 432 in ISO?
CNMG 432 (ANSI) = CNMG 120408 (ISO). Same insert, just different digit format. IC = 12.7mm (1/2"), thickness = 4.76mm (3/16"), corner radius = 0.8mm (1/32").
What does the 4th letter (chipbreaker) mean?
G = chipbreaker both faces (most common). M = medium chipbreaker. F = fine finishing. R = roughing. T = turned/tipped. W = wiper. These are mostly 1:1 between ANSI and ISO, but brand-specific chipbreakers (Mitsubishi MV, Kennametal KC) only exist in that brand's catalog.
Can I use a CNMG insert in a CNMA holder?
No. CNMA has a different tolerance class (A vs G) and a different hole type. CNMG has a chipbreaker on both faces, while CNMA is flat. Always match the full 4-letter code (positions 1-4) to your holder.
Are ANSI and ISO inserts interchangeable?
The inserts themselves are physically identical — same shape, same dimensions, same IC. The only difference is the designation system used in catalogs and on the box. A CNMG 432 from Mitsubishi Japan and a CNMG 120408 from Mitsubishi US are the exact same insert.
Where does the difference matter?
Three places: (1) When ordering, you must specify the designation your vendor's catalog uses. (2) When comparing prices, US catalogs use ANSI, Asian catalogs use ISO. (3) When reading a holder code like DCLNR 2020K, the "2020" is in mm (ISO), not inch (ANSI).
How do I order from BEYOND / OYYU if I only have an ANSI code?
Use the converter above to get the ISO code, then email it to chao@cnchome-beyond.com. We stock both ANSI and ISO inserts from Mitsubishi, Kennametal, Iscar, Walter, Sandvik, Sumitomo, Tungaloy, Korloy, and our own OYYU brand. Reply within 24 hours with stock and price.

About BEYOND & OYYU

BEYOND and OYYU are precision cutting tool brands from Super Industrial Trading Co., Ltd (Hangzhou, China). 13+ years OEM/ODM for Mitsubishi / Kyocera / Sandvik / Korloy / Sumitomo / Walter / Tungaloy. We cross-reference all major brands — tell us your ANSI code, we quote the ISO equivalent or the same brand's US-stock version.