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Laboratory rubber stoppers #0–#13 (25 mm tall)
What size rubber stopper fits a 25 mm test tube or a soda bottle? · Standard part · basis: Standard US laboratory stopper sizes: top and bottom diameters, 25 mm tall; drawn as a straight taper (loft) between them
Long Earth Society build part. Displacer-rod glands and test-tube closures. The engines
Exact dimensions. Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part. Mating features
- sizes
- 15 in table
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.
- Each file is a solid truncated cone between those diameters; one- and two-hole versions of the real stoppers take 5–7 mm tube.
- Pick the stopper whose mid-diameter is about 1 mm over the opening: 16 mm test tube #0, 20 mm #2, 25 mm #4/#5, 28 mm soda-bottle neck #6.
- The table gives the opening range each number seals.
- One file is a #4 bored through on its axis at Ø4 (stopper-4-bore-4): the stopper of the test-tube marble engine, with a 4 mm OD brass tube through it. The bore is my geometry, drawn at the tube's OD.
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 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| axial bore | Ø4 | brass-4mm tube OD | press | stopper-4-bore-4* |
| taper in a tube mouth | #4: Ø22.6 line 10.83 above the small end | 25 × 150 test tube bore Ø22.6 | press | stopper-4-bore-4* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Bung | web | CC BY-SA 4.0 (text) |
| Wikipedia | Cork (material) | web | CC BY-SA 4.0 (text) |
| Long Earth Society | Engine builds (videos and write-ups) | web, video | LES site |
Free files
★ Free files 16 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| stopper-0 | #0 stopper: Ø17 top, Ø13 bottom, 25 mm tall | STEP · STL |
| stopper-1 | #1 stopper: Ø19 top, Ø15 bottom, 25 mm tall | STEP · STL |
| stopper-2 | #2 stopper: Ø20 top, Ø16 bottom, 25 mm tall | STEP · STL |
| stopper-3 | #3 stopper: Ø24 top, Ø18 bottom, 25 mm tall | STEP · STL |
| stopper-4 | #4 stopper: Ø26 top, Ø20 bottom, 25 mm tall | STEP · STL |
| stopper-5 | #5 stopper: Ø27 top, Ø23 bottom, 25 mm tall | STEP · STL |
| stopper-6 | #6 stopper: Ø32 top, Ø26 bottom, 25 mm tall | STEP · STL |
| stopper-6-5 | #6.5 stopper: Ø34 top, Ø27 bottom, 25 mm tall | STEP · STL |
| stopper-7 | #7 stopper: Ø37 top, Ø30 bottom, 25 mm tall | STEP · STL |
| stopper-8 | #8 stopper: Ø41 top, Ø33 bottom, 25 mm tall | STEP · STL |
| stopper-9 | #9 stopper: Ø45 top, Ø37 bottom, 25 mm tall | STEP · STL |
| stopper-10 | #10 stopper: Ø50 top, Ø42 bottom, 25 mm tall | STEP · STL |
| stopper-11 | #11 stopper: Ø56 top, Ø48 bottom, 25 mm tall | STEP · STL |
| stopper-12 | #12 stopper: Ø64 top, Ø54 bottom, 25 mm tall | STEP · STL |
| stopper-13 | #13 stopper: Ø68 top, Ø58 bottom, 25 mm tall | STEP · STL |
| stopper-4-bore-4 | #4 stopper (Ø26 top, Ø20 bottom, 25 tall) bored Ø4 on its axis for a 4 mm OD tube (the bore is my geometry, at the tube's OD) | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=rubber-stoppers
How it fits
Goes in or on
Borosilicate test tubes, 10×75 to 30×200 mmstopper closes the tube mouth
PET bottle necks#6 in the 28 mm neckAlternatives
Wine cork #9a parallel Ø24 cork for a 22–23 mm openingIn these build lists
Test-tube marble enginecrank and flywheel at the end.You might also need
Questions
What rubber stopper fits a 20 mm test tube?
#2 (20 mm top, 16 mm bottom); #1 for 16–18 mm tubes, #4 for a 25 mm tube.
Which stopper fits a soda bottle neck?
#6 (32/26 mm) for the 28 mm PCO 1881 neck; #7 for a 38 mm neck.
How tall is a lab rubber stopper?
25 mm for every size from #0 to #13.