# M20 — Carbide insert grade cross-reference by ISO application group and manufacturer

For M20, manufacturer is Sandvik; grade designation(s) is GC1020 GC2025 GC2030 GC4125 GC3040, recorded from its source on 2026-08-11.

- **ISO application code:** M20 _(verified: appears in the quote below)_
- **Manufacturer:** Sandvik _(our reading, not quoted from the source)_
- **Grade designation(s):** GC1020 GC2025 GC2030 GC4125 GC3040 _(verified: appears in the quote below)_

## What the source says

> M20 | R-300 | US7020 F620 F7030 AP20M UP20M | GC1020 GC2025 GC2030 GC4125 GC3040 |

## Sources disagree

More than one authority states this, and they do not state the same
thing. Both are reproduced with the source each came from.

### Grade designation(s)

romaycorp.com says grade designation(s) is **GC1020 GC2025 GC2030 GC4125 GC3040**, as of 2026-08-11.

> M20 | R-300 | US7020 F620 F7030 AP20M UP20M | GC1020 GC2025 GC2030 GC4125 GC3040 |

Source: https://romaycorp.com/charts/carbide-comparison-chart/

aceratool.com says grade designation(s) is **GC2025**, as of 2026-08-11.

> M20 | AC2115 | GC2025 |

Source: https://www.aceratool.com/carbide-insert-grades-chart/


## Source

- https://romaycorp.com/charts/carbide-comparison-chart/
- https://www.aceratool.com/carbide-insert-grades-chart/

Last verified: 2026-08-11. Review by: 2028-08-10.
Part of [Carbide insert grade cross-reference by ISO application group and manufacturer](https://referencesource.org/industrial-consumable-tooling-cross-reference/).