---
title: "Grindstone Drop Rates (CN server)"
description: "Grindstone drop rates on the CN server: 10-12 45.39% (573,239 samples), 10-12 45.24% (223,987), 15-15 44.52% (10,904); 178 stages in total. Updated 2026-10-24. Crowdsourced Arknights drop data by Penguin Statistics."
lang: en
server: CN
item_id: "30093"
as_of: 2026-10-23T18:51:03Z
time_zone: UTC+8
rows: 50
rows_total: 178
canonical: "https://penguin-stats.io/en/result/cn/item/30093"
api: "https://penguin-stats.io/PenguinStats/api/v2/result/matrix?server=CN&itemFilter=30093&show_closed_zones=true"
license: CC BY-NC 4.0
license_url: https://creativecommons.org/licenses/by-nc/4.0/
attribution: "Data: Penguin Statistics (penguin-stats.io), CC BY-NC 4.0"
---

# Grindstone Drop Rates (CN server)

Server: **CN server** · [US server](https://penguin-stats.io/en/result/us/item/30093.md) · [JP server](https://penguin-stats.io/en/result/jp/item/30093.md) · [KR server](https://penguin-stats.io/en/result/kr/item/30093.md)

Drops of Grindstone by stage on the CN server, by percentage, highest first: 50 of 178 stages

| Stage | ID | Loots | Samples | Percentage | Sanity Required Per Item | Sanity | Time Range |
| --- | --- | ---: | ---: | ---: | ---: | ---: | --- |
| [CV-7](https://penguin-stats.io/en/result/cn/stage/act28sre_zone1/act28side_07_rep.md) Come Catastrophes or Wakes of Vultures - Rerun | `act28side_07_rep` | 677328 | 1000203 | 67.72% | 31.01 | 21 | 2024-09-19 to 2024-09-29 |
| [MT-9](https://penguin-stats.io/en/result/cn/stage/act42sre_zone1/act42side_09_rep.md) The Masses' Travels - Rerun | `act42side_09_rep` | 1054641 | 1558059 | 67.69% | 31.02 | 21 | 2026-05-22 to 2026-06-01 |
| [EP-8](https://penguin-stats.io/en/result/cn/stage/act39side_zone1/act39side_08.md) Exodus From The Pale Sea | `act39side_08` | 2142363 | 3165799 | 67.67% | 31.03 | 21 | 2024-12-05 to 2024-12-19 |
| [EP-8](https://penguin-stats.io/en/result/cn/stage/act39sre_zone1/act39side_08_rep.md) Exodus From The Pale Sea - Rerun | `act39side_08_rep` | 730915 | 1080108 | 67.67% | 31.03 | 21 | 2025-12-19 to 2025-12-29 |
| [CV-7](https://penguin-stats.io/en/result/cn/stage/act28side_zone1/act28side_07.md) Come Catastrophes or Wakes of Vultures | `act28side_07` | 3128673 | 4623640 | 67.67% | 31.03 | 21 | 2023-09-05 to 2023-09-19 |
| [LE-6](https://penguin-stats.io/en/result/cn/stage/act18sre_zone1/act18side_06_rep.md) Lingering Echoes - Rerun | `act18side_06_rep` | 3791790 | 5603884 | 67.66% | 31.04 | 21 | 2023-06-20 to 2023-06-30 |
| [MT-9](https://penguin-stats.io/en/result/cn/stage/act42side_zone1/act42side_09.md) The Masses' Travels | `act42side_09` | 2794313 | 4129724 | 67.66% | 31.04 | 21 | 2025-05-01 to 2025-05-22 |
| [AS-8](https://penguin-stats.io/en/result/cn/stage/act35side_zone1/act35side_08.md) Adventure That Cannot Wait for the Sun | `act35side_08` | 5334356 | 7884042 | 67.66% | 31.04 | 21 | 2024-08-01 to 2024-08-22 |
| [EA-6](https://penguin-stats.io/en/result/cn/stage/act41side_zone1/act41side_06.md) When Elegies Are Ashes | `act41side_06` | 2658167 | 3928887 | 67.66% | 31.04 | 21 | 2025-03-07 to 2025-03-21 |
| [EA-6](https://penguin-stats.io/en/result/cn/stage/act41sre_zone1/act41side_06_rep.md) When Elegies Are Ashes - Rerun | `act41side_06_rep` | 620837 | 917910 | 67.64% | 31.05 | 21 | 2026-03-27 to 2026-04-06 |
| [LE-6](https://penguin-stats.io/en/result/cn/stage/act18side_zone1/act18side_06.md) Lingering Echoes | `act18side_06` | 346113 | 511895 | 67.61% | 31.06 | 21 | 2022-06-09 to 2022-06-23 |
| [AS-8](https://penguin-stats.io/en/result/cn/stage/act35sre_zone1/act35side_08_rep.md) Adventure That Cannot Wait for the Sun - Rerun | `act35side_08_rep` | 215834 | 319666 | 67.52% | 31.10 | 21 | 2025-08-25 to 2025-09-04 |
| [OD-8](https://penguin-stats.io/en/result/cn/stage/act17d0_zone1/act17d0_08.md) Operation Originium Dust | `act17d0_08` | 16596 | 28546 | 58.14% | 30.96 | 18 | 2021-03-09 to 2021-03-23 |
| [TW-8](https://penguin-stats.io/en/result/cn/stage/act11d0_zone1/act11d0_08.md) Twilight of Wolumonde | `act11d0_08` | 29055 | 50174 | 57.91% | 31.08 | 18 | 2020-07-09 to 2020-07-23 |
| [OD-8](https://penguin-stats.io/en/result/cn/stage/act1r6sre_zone1/act17d0_08_rep.md) Operation Originium Dust - Rerun | `act17d0_08_rep` | 4392122 | 7608231 | 57.73% | 31.18 | 18 | 2024-03-21 to 2024-03-31 |
| [BI-8](https://penguin-stats.io/en/result/cn/stage/act14sre_zone1/act14side_08_rep.md) Break The Ice - Rerun | `act14side_08_rep` | 176917 | 306620 | 57.70% | 31.20 | 18 | 2022-12-01 to 2022-12-11 |
| [TW-8](https://penguin-stats.io/en/result/cn/stage/act5sre_zone1/act11d0_08_rep.md) Twilight of Wolumonde - Rerun | `act11d0_08_rep` | 14872 | 25806 | 57.63% | 31.23 | 18 | 2021-06-17 to 2021-06-27 |
| [BI-8](https://penguin-stats.io/en/result/cn/stage/act14side_zone1/act14side_08.md) Break The Ice | `act14side_08` | 36646 | 64657 | 56.68% | 31.76 | 18 | 2021-12-21 to 2022-01-04 |
| [GT-6](https://penguin-stats.io/en/result/cn/stage/1stact_zone1/a001_06.md) The Knight & The Hunters | `a001_06` | 5208 | 10649 | 48.91% | 30.67 | 15 | 2019-05-30 to 2019-06-13 |
| [GT-6](https://penguin-stats.io/en/result/cn/stage/act13d2_zone1/a001_06_rep.md) The Knight & The Hunters - Rerun | `a001_06_rep` | 6755 | 14044 | 48.10% | 31.19 | 15 | 2020-10-01 to 2020-10-11 |
| [BW-8](https://penguin-stats.io/en/result/cn/stage/act13mini_zone1/act13mini_08.md) It's Been a While | `act13mini_08` | 38346 | 81755 | 46.90% | 44.77 | 21 | 2022-09-15 to 2022-09-22 |
| [DC-8](https://penguin-stats.io/en/result/cn/stage/act14mini_zone1/act14mini_08.md) Chunfen | `act14mini_08` | 27486 | 58731 | 46.80% | 44.87 | 21 | 2023-02-14 to 2023-02-21 |
| [10-12](https://penguin-stats.io/en/result/cn/stage/main_10/main_10-11.md) Episode 10 (Standard) | `main_10-11` | 260213 | 573239 | 45.39% | 46.26 | 21 | 2022-04-14 until now |
| [10-12](https://penguin-stats.io/en/result/cn/stage/main_10_tough/tough_10-11.md) Episode 10 (Tough) | `tough_10-11` | 101322 | 223987 | 45.24% | 46.42 | 21 | 2022-04-14 until now |
| [15-15](https://penguin-stats.io/en/result/cn/stage/main_15/main_15-14.md) Episode 15 | `main_15-14` | 4855 | 10904 | 44.52% | 47.16 | 21 | 2025-04-21 until now |
| [9-16](https://penguin-stats.io/en/result/cn/stage/main_9/main_09-14.md) Episode 9 | `main_09-14` | 83493 | 208495 | 40.05% | 44.95 | 18 | 2021-09-17 until now |
| [AF-8](https://penguin-stats.io/en/result/cn/stage/act6d5_zone1/act6d5_08.md) Ancient Forge | `act6d5_08` | 3412 | 8926 | 38.22% | 47.09 | 18 | 2020-01-09 to 2020-01-16 |
| [13-21](https://penguin-stats.io/en/result/cn/stage/main_13/main_13-19.md) Episode 13 (Standard) | `main_13-19` | 3071 | 8136 | 37.75% | 63.58 | 24 | 2023-10-08 until now |
| [13-21](https://penguin-stats.io/en/result/cn/stage/main_13_tough/tough_13-19.md) Episode 13 (Tough) | `tough_13-19` | 13713 | 36494 | 37.58% | 63.87 | 24 | 2023-10-08 until now |
| [5-7](https://penguin-stats.io/en/result/cn/stage/main_5/main_05-07.md) Episode 5 | `main_05-07` | 20759 | 59511 | 34.88% | 60.20 | 21 | 2019-07-09 until now |
| [4-8](https://penguin-stats.io/en/result/cn/stage/main_4/main_04-08.md) Episode 4 | `main_04-08` | 127823 | 379364 | 33.69% | 62.33 | 21 | 2019-05-01 until now |
| [12-8](https://penguin-stats.io/en/result/cn/stage/main_12/main_12-07.md) Episode 12 (Standard) | `main_12-07` | 21687 | 67602 | 32.08% | 65.46 | 21 | 2023-04-06 until now |
| [3-3](https://penguin-stats.io/en/result/cn/stage/main_3/main_03-03.md) Episode 3 | `main_03-03` | 134247 | 418571 | 32.07% | 46.77 | 15 | 2019-05-01 until now |
| [7-17](https://penguin-stats.io/en/result/cn/stage/main_7/main_07-15.md) Episode 7 | `main_07-15` | 52230 | 163028 | 32.04% | 65.55 | 21 | 2020-05-01 until now |
| [14-5](https://penguin-stats.io/en/result/cn/stage/main_14_tough/tough_14-04.md) Episode 14 (Tough) | `tough_14-04` | 32629 | 101980 | 32.00% | 65.64 | 21 | 2024-05-15 until now |
| [12-8](https://penguin-stats.io/en/result/cn/stage/main_12_tough/tough_12-07.md) Episode 12 (Tough) | `tough_12-07` | 58746 | 183951 | 31.94% | 65.76 | 21 | 2023-04-06 until now |
| [LE-6](https://penguin-stats.io/en/result/cn/stage/permanent_sidestory_14_zone1/act18side_06_perm.md) Lingering Echoes - Side Story | `act18side_06_perm` | 8168 | 25608 | 31.90% | 65.84 | 21 | 2023-07-04 until now |
| [GT-6](https://penguin-stats.io/en/result/cn/stage/permanent_sidestory_1_zone1/a001_06_perm.md) The Knight & The Hunters - Side Story | `a001_06_perm` | 13598 | 42671 | 31.87% | 47.07 | 15 | 2021-04-15 until now |
| [16-11](https://penguin-stats.io/en/result/cn/stage/main_16/main_16-10.md) Episode 16 | `main_16-10` | 11478 | 36074 | 31.82% | 66.00 | 21 | 2025-10-09 until now |
| [14-5](https://penguin-stats.io/en/result/cn/stage/main_14/main_14-04.md) Episode 14 (Standard) | `main_14-04` | 11694 | 36793 | 31.78% | 66.07 | 21 | 2024-05-15 until now |
| [6-14](https://penguin-stats.io/en/result/cn/stage/main_6/main_06-12.md) Episode 6 | `main_06-12` | 7903 | 30880 | 25.59% | 70.33 | 18 | 2019-12-24 until now |
| [BI-8](https://penguin-stats.io/en/result/cn/stage/permanent_sidestory_11_zone1/act14side_08_perm.md) Break The Ice - Side Story | `act14side_08_perm` | 2558 | 10030 | 25.50% | 70.58 | 18 | 2022-12-15 until now |
| [TW-8](https://penguin-stats.io/en/result/cn/stage/permanent_sidestory_4_zone1/act11d0_08_perm.md) Twilight of Wolumonde - Side Story | `act11d0_08_perm` | 3231 | 12990 | 24.87% | 72.37 | 18 | 2021-07-01 until now |
| [Operation Lead Seal Supplies](https://penguin-stats.io/en/result/cn/stage/gachabox/randomMaterialRune_4.md) Supplies | `randomMaterialRune_4` | 172 | 2233 | 7.70% | — | — | 2021-02-02 until now |
| [Operation Wild Scales Supplies](https://penguin-stats.io/en/result/cn/stage/gachabox/randomMaterialRune_6.md) Supplies | `randomMaterialRune_6` | 90 | 1201 | 7.49% | — | — | 2021-09-09 until now |
| [Operation Blade Supplies](https://penguin-stats.io/en/result/cn/stage/gachabox/randomMaterialRune_2.md) Supplies | `randomMaterialRune_2` | 405 | 5490 | 7.38% | — | — | 2020-08-11 until now |
| [Operation Spectrum Supplies](https://penguin-stats.io/en/result/cn/stage/gachabox/randomMaterialRune_5.md) Supplies | `randomMaterialRune_5` | 195 | 2672 | 7.30% | — | — | 2021-05-29 until now |
| [Operation Cinder Supplies](https://penguin-stats.io/en/result/cn/stage/gachabox/randomMaterialRune_3.md) Supplies | `randomMaterialRune_3` | 150 | 2061 | 7.28% | — | — | 2020-11-29 until now |
| [Operation Barrenland Supplies](https://penguin-stats.io/en/result/cn/stage/gachabox/randomMaterialRune_0.md) Supplies | `randomMaterialRune_0` | 228 | 3134 | 7.27% | — | — | 2020-03-31 until now |
| [赝波行动物资补给](https://penguin-stats.io/en/result/cn/stage/gachabox/randomMaterialRune_11.md) Supplies | `randomMaterialRune_11` | 55 | 772 | 7.12% | — | — | 2022-11-29 until now |

Samples: runs of the stage reported in the time range. Loots: total number of the item dropped in those runs. Percentage = Loots ÷ Samples, the expected number dropped per run, which can exceed 100%. Sanity Required Per Item = Sanity ÷ Percentage. Time Range: since the drop table of the stage last changed.

Updated 2026-10-24 02:51 (UTC+8). [Full data (JSON)](https://penguin-stats.io/PenguinStats/api/v2/result/matrix?server=CN&itemFilter=30093&show_closed_zones=true). License: [CC BY-NC 4.0](https://creativecommons.org/licenses/by-nc/4.0/)

## Related Items

- [Grindstone Pentahydrate](https://penguin-stats.io/en/result/cn/item/30094.md) `30094`