# K20 — Carbide insert grade cross-reference by ISO application group and manufacturer

For K20, manufacturer is Sumitomo; grade designation(s) is AC500G EH20Z, recorded from its source on 2026-08-11.

- **ISO application code:** K20 _(verified: appears in the quote below)_
- **Manufacturer:** Sumitomo _(our reading, not quoted from the source)_
- **Grade designation(s):** AC500G EH20Z _(verified: appears in the quote below)_

## What the source says

> K20 | R-300 R-400 | UP10H UC6010 AP15TF | GC1020 GC1120 GC3025 GC3020 GC4025 | TX150 T15M T25M T250M TP200 | AC500G EH20Z |

## 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 **AC500G EH20Z**, as of 2026-08-11.

> K20 | R-300 R-400 | UP10H UC6010 AP15TF | GC1020 GC1120 GC3025 GC3020 GC4025 | TX150 T15M T25M T250M TP200 | AC500G EH20Z |

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

aceratool.com says grade designation(s) is **AC700G AC820P**, as of 2026-08-11.

> K20 | AC3125 | GC3215 GC3020 K20W | NC315K | TT1500 | WAK20 | UE6010 | AC700G AC820P |

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/).