Rubber Stopper Size Guide

Need help working out what size rubber stopper you need for your glassware? This rubber stopper size chart will help you match them up. You can also browse our full range of beakers, flasks and test tubes.

Rubber Stoppers (all sizes in mm)

Size Holes Top Bottom Height For Use With
0 Solid 12 9 16 12x100mm Test Tubes
1 Solid 13 10 20 15x150mm Test Tubes
1 1 Hole 15 10 26  
2 Solid 16 13.5 17 18x150mm Test Tubes
25ml Narrow Mouth Erlenmeyer Flask
3 Solid 19 14 26 18x180mm Test Tubes
3 1 Hole 19 14 26

50ml Round Base Boiling Flask

18x180 Test Tubes

18x150 Test Tubes

4 Solid 21 16 26  
5 Solid 22 18 27  
6 Solid 23 17 26 50ml Narrow Mouth Erlenmeyer Flask
6 1 Hole 28 18 26 25ml Wide Mouth Erlenmeyer Flask
7 Solid 26 21 29 25x200mm Test Tubes
7 1 Hole 27 21 25 25ml Narrow Mouth Erlenmeyer Flask
8 Solid 27 22 28 100ml Narrow Mouth Erlenmeyer Flask
9 Solid 29 24 29 50ml Flared Rim Erlenmeyer Flask
10 Solid 33 27 30 50ml Wide Mouth Erlenmeyer Flask
250ml Narrow Mouth Erlenmeyer Flask
10 1 Hole 33 27 30 50ml Wide Mouth Erlenmeyer Flask
250ml Narrow Mouth Erlenmeyer Flask
11 Solid 34 30 31  
12 Solid 36 31 31 100ml Wide Mouth Erlenmeyer Flask
12 1 Hole 35 30 32 100ml Wide Mouth Erlenmeyer Flask
13 Solid 40 33 25 1000ml Narrow Mouth Erlenmeyer Flask
13 1 Hole 41 32 25 1000ml Round Base Boiling Flask
13 2 Holes 40 33 25 1000ml Round Base Boiling Flask
14 Solid 40 36 31  
14 1 Hole 40 36 31 2000ml Narrow Mouth Erlenmeyer Flask
15 Solid 44 36 25 2000ml Narrow Mouth Erlenmeyer Flask 
15 1 Hole 43 36 25 2000ml Narrow Mouth Erlenmeyer Flask
15 2 Holes 45 37 25 2000ml Narrow Mouth Erlenmeyer Flask
16 Solid 47 39 36  
17 Solid 48 42 38 2000ml Narrow Mouth Erlenmeyer Flask
18 Solid 51 45 40 1000ml Wide Mouth Erlenmeyer Flask
19 Solid 53 49 40  
20 Solid 59 50 41  
21 Solid 61 54 4 1000ml Narrow Mouth Erlenmeyer Flask
22 Solid 65 57 41 5000ml Narrow Mouth Erlenmeyer Flask
23 Solid 65 60 38  
24 Solid 70 62 38  
25 Solid 74 66 45