# Laboratory rubber stoppers #0–#13 and wine corks

> What size rubber stopper fits a 25 mm test tube or a soda bottle?

- Category: Hardware › Found & household materials
- Kind: Standard part
- Basis: Standard US laboratory stopper sizes (top and bottom diameters, 25 mm tall, taper ~1:8); wine corks #9 (Ø24 × 44/49)
- Page: https://xemstudio.com/objects/rubber-stoppers-and-corks/ · JSON: https://xemstudio.com/api/geometry?object=rubber-stoppers-and-corks · Plain text: https://xemstudio.com/objects/rubber-stoppers-and-corks/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

## Notes

- Stopper number → top/bottom diameter (mm): #0 17/13, #1 19/15, #2 20/16, #3 24/18, #4 26/20, #5 27/23, #6 32/26, #6½ 34/27, #7 37/30, #8 41/33, #9 45/37, #10 50/42, #11 56/48, #12 64/54, #13 68/58. All 25 mm tall; one- and two-hole versions take 5–7 mm glass tube.
- Pick the stopper whose mid-diameter is 1 mm over the opening: 16 mm test tube → #0; 20 mm → #2; 25 mm → #4/#5; 28 mm soda-bottle neck → #6; 70 mm jar mouth → #13 is too small, use a printed disc.
- Corks: #9 natural wine cork Ø24 × 44 mm (49 long for aged wines), compressible to Ø21; silicone stoppers survive 230 °C, natural rubber 80 °C. A cork drilled 3 mm is the cheapest displacer-rod gland for a test-tube engine.

## Sizes

| number | top_mm | bottom_mm | height_mm | fits_opening_mm |
|---|---|---|---|---|
| #0 | 17 | 13 | 25 | 14–16 |
| #1 | 19 | 15 | 25 | 16–18 |
| #2 | 20 | 16 | 25 | 17–19 |
| #3 | 24 | 18 | 25 | 19–23 |
| #4 | 26 | 20 | 25 | 21–25 |
| #5 | 27 | 23 | 25 | 24–26 |
| #6 | 32 | 26 | 25 | 27–31 |
| #6.5 | 34 | 27 | 25 | 28–33 |
| #7 | 37 | 30 | 25 | 31–36 |
| #8 | 41 | 33 | 25 | 34–40 |
| #9 | 45 | 37 | 25 | 38–44 |
| #10 | 50 | 42 | 25 | 43–49 |
| #11 | 56 | 48 | 25 | 49–55 |
| #12 | 64 | 54 | 25 | 55–63 |
| #13 | 68 | 58 | 25 | 59–67 |
| #9 cork | 24 | 24 | 44 / 49 | 22–23 |

## Where the files are

- Wikipedia: [Bung](https://en.wikipedia.org/wiki/Bung) — web — CC BY-SA 4.0 (text)
- Wikipedia: [Cork (material)](https://en.wikipedia.org/wiki/Cork_(material)) — web — CC BY-SA 4.0 (text)
- Long Earth Society: [Engine builds (videos and write-ups)](https://longearthsociety.com/engineering/) — web, video — LES site

## Free STEP/STL (17 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/index.json

- stopper-0: [STEP](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-0.step) · [STL](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-0.stl) — #0 stopper: Ø17 top, Ø13 bottom, 25 mm tall
- stopper-1: [STEP](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-1.step) · [STL](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-1.stl) — #1 stopper: Ø19 top, Ø15 bottom, 25 mm tall
- stopper-2: [STEP](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-2.step) · [STL](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-2.stl) — #2 stopper: Ø20 top, Ø16 bottom, 25 mm tall
- stopper-3: [STEP](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-3.step) · [STL](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-3.stl) — #3 stopper: Ø24 top, Ø18 bottom, 25 mm tall
- stopper-4: [STEP](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-4.step) · [STL](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-4.stl) — #4 stopper: Ø26 top, Ø20 bottom, 25 mm tall
- stopper-5: [STEP](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-5.step) · [STL](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-5.stl) — #5 stopper: Ø27 top, Ø23 bottom, 25 mm tall
- stopper-6: [STEP](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-6.step) · [STL](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-6.stl) — #6 stopper: Ø32 top, Ø26 bottom, 25 mm tall
- stopper-6-5: [STEP](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-6-5.step) · [STL](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-6-5.stl) — #6.5 stopper: Ø34 top, Ø27 bottom, 25 mm tall
- stopper-7: [STEP](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-7.step) · [STL](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-7.stl) — #7 stopper: Ø37 top, Ø30 bottom, 25 mm tall
- stopper-8: [STEP](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-8.step) · [STL](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-8.stl) — #8 stopper: Ø41 top, Ø33 bottom, 25 mm tall
- stopper-9: [STEP](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-9.step) · [STL](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-9.stl) — #9 stopper: Ø45 top, Ø37 bottom, 25 mm tall
- stopper-10: [STEP](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-10.step) · [STL](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-10.stl) — #10 stopper: Ø50 top, Ø42 bottom, 25 mm tall
- stopper-11: [STEP](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-11.step) · [STL](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-11.stl) — #11 stopper: Ø56 top, Ø48 bottom, 25 mm tall
- stopper-12: [STEP](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-12.step) · [STL](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-12.stl) — #12 stopper: Ø64 top, Ø54 bottom, 25 mm tall
- stopper-13: [STEP](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-13.step) · [STL](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/stopper-13.stl) — #13 stopper: Ø68 top, Ø58 bottom, 25 mm tall
- cork-9-wine: [STEP](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/cork-9-wine.step) · [STL](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/cork-9-wine.stl) — #9 wine cork Ø24 × 44 (natural)
- cork-9-wine-49: [STEP](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/cork-9-wine-49.step) · [STL](https://xemstudio.com/files/hardware/rubber-stoppers-and-corks/cork-9-wine-49.stl) — #9 wine cork Ø24 × 49 (long)

## Questions

**What rubber stopper fits a 20 mm test tube?**

#2 (20 mm top, 16 mm bottom); a #1 for 16–18 mm tubes, #4 for a 25 mm tube.

**What size is a wine cork?**

#9: 24 mm diameter, 44 mm long (49 mm for long corks); it compresses to 21–22 mm in the bottle neck.

**Which stopper fits a soda bottle neck?**

#6 (32/26 mm) for the 28 mm PCO 1881 neck; #7 for a 38 mm juice neck.

## Fits with

- [Borosilicate test tubes, 10×75 to 30×200 mm](https://xemstudio.com/objects/borosilicate-test-tubes/)
- [Mason jars: regular (70 mm) and wide-mouth (86 mm), half-pint to half-gallon](https://xemstudio.com/objects/mason-jars-and-lids/)
- [PET bottle necks: PCO 1881 (soda, 28 mm) and 38 mm (milk/juice)](https://xemstudio.com/objects/pet-bottle-necks-pco1881/)
- [Hobby brass tube (K&S), 1/16–21/32 in and 1–12 mm, telescoping](https://xemstudio.com/objects/brass-tube-ks/)