# P20 — Carbide insert grade cross-reference by ISO application group and manufacturer

For P20, manufacturer is Walter; grade designation(s) is WTA31 WXH15 WQM25 WTL82 WAP20 WTN43 WAP25 WTA43 WXM15 WTA41 WXP20 WTP20, recorded from its source on 2026-08-11.

- **ISO application code:** P20 _(verified: appears in the quote below)_
- **Manufacturer:** Walter _(our reading, not quoted from the source)_
- **Grade designation(s):** WTA31 WXH15 WQM25 WTL82 WAP20 WTN43 WAP25 WTA43 WXM15 WTA41 WXP20 WTP20 _(verified: appears in the quote below)_

## What the source says

> P20 | R-200 R-300 | UC6010 UE6020 UC6025 F620 F7030 UP20M AP20M | GC4020 GC4025 GC4225 GC4030 GC3040 | TP200 T250M T25M CP20 F25M | AC230 AC2000 AC3000 | TD915 T7020 | KC725M KC9125 KC9040 KC625M KC850 CM4 KC9025 KC631M | IC9015 IC635 | SV410 SV325 | WTA31 WXH15 WQM25 WTL82 WAP20 WTN43 WAP25 WTA43 WXM15 WTA41 WXP20 WTP20 |

## 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 **WTA31 WXH15 WQM25 WTL82 WAP20 WTN43 WAP25 WTA43 WXM15 WTA41 WXP20 WTP20**, as of 2026-08-11.

> P20 | R-200 R-300 | UC6010 UE6020 UC6025 F620 F7030 UP20M AP20M | GC4020 GC4025 GC4225 GC4030 GC3040 | TP200 T250M T25M CP20 F25M | AC230 AC2000 AC3000 | TD915 T7020 | KC725M KC9125 KC9040 KC625M KC850 CM4 KC9025 KC631M | IC9015 IC635 | SV410 SV325 | WTA31 WXH15 WQM25 WTL82 WAP20 WTN43 WAP25 WTA43 WXM15 WTA41 WXP20 WTP20 |

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

aceratool.com says grade designation(s) is **WAP20**, as of 2026-08-11.

> P20 | AC1125 AC1225 | GC4015 GC4225 GC4025 GC4215 LC25 | NC3015 NC3020 NC500H | TT1500 | WAP20 |

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