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

For K20, manufacturer is KORLOY; grade designation(s) is NC315K, recorded from its source on 2026-08-11.

- **ISO application code:** K20 _(verified: appears in the quote below)_
- **Manufacturer:** KORLOY _(our reading, not quoted from the source)_
- **Grade designation(s):** NC315K _(verified: appears in the quote below)_

## What the source says

> K20 | AC3125 | GC3215 GC3020 K20W | NC315K |

## Source

- 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/carbide-insert-grade-cross-reference/).