Rubber Stopper - Buy Common Rubber Stopper Sizes

Rubber Stopper

$1.00$5.95

Rubber stoppers are ideal for plugging joints or holes in laboratory glassware and creating a liquid-tight seal.

Rubber bungs are often used with glass containers such as test tubes, flasks, jugs, and many other pieces of standard lab equipment.

Clear

$1.00$5.95

Size
#0 #12 #2 #3 #7 #8 Size #1 Size #12 Size #4 Size #5 Size #6 Size #7
Style
Single hole Solid Two Hole
Clear selection

Sizes Chart:

Size No.

Top Side
(inches)

Top Side
(MM)

Bottom Side
(inches)

Bottom Side
(MM)

Length
(MM)

Diameter (in MM)
1-Hole

Diameter (in MM)
2-Holes

Rubber per pound (approx.)

000

1/2

12. 7

5/16

8.2

21

3

183

00

19/32

15

13/32

10

25

3

3

106

0

21/32

17

1/2

13

25

3

3

76

1

3/4

19

9/16

14

25

4

4

64

2

25/32

20

5/8

16

25

5

5

52

3

15/16

24

23/32

18

25

5

5

39

4

1

26

3/4

20

25

5

5

33

5

1-1/16

27

29/32

23

25

5

5

28

5-1/2

1-7/64

28

31/32

24

25

5

5

25

6

1-1/4

32

1-1/32

26

25

5

5

21

6-1/2

1-11/32

34

1-1/16

27

25

5

5

19

7

1-7/16

37

1-3/16

30

25

5

5

15

7-1/2

1-1/2

39

1-1/8

31

25

5

5

14

8

1-5/8

41

1-5/16

33

25

5

5

12

8-1/2

1-11/16

43

1-13/32

36

25

5

5

11

9

1-3/4

45

1-15/32

37

25

5

5

10

9-1/2

1-13/16

46

1-1/2

38

25

5

5

9

10

1-31/32

50

1-5/8

42

25

5

5

8

10-1/2

2-5/64

53

1-3/4

45

25

5

5

7

11

2-13/64

56

1-7/8

48

25

5

5

6

11-1/2

2-15/32

63

2

50

25

5

5

5

12

2-1/2

64

2-1/8

54

25

5

5

5

13

2-11/16

68

2-9/32

58

25

5

5

4

13-1/2

2-31/32

75

2-7/16

62

35

5

5

3

14

3-1/2

90

3

75

39

5

5

9-1/2  Oz.

15

4

103

3-1/4

83

39

5

5

12-1/2 Oz.

16

5

127

3-1/2

90

50

5

5

21-1/4 Oz.

We carry the most common laboratory sizes – they  should take care of just about all of the most common tasks in your lab.

What are rubber stoppers?

Rubber stoppers are ideal for plugging joints or holes in laboratory glassware and creating a liquid-tight seal.

Rubber bungs are often used with glass containers such as test tubes, flasks, jugs, and many other pieces of standard lab equipment.

We carry stoppers both with and without pre-drilled holes, in a wide range of the most common sizes.

Practically speaking, there are around 16 different sizes of standard laboratory rubber stopper, but we’ve narrowed down the selection somewhat to only those most practical for commercial and hobbyist use.

Available with and without holes.

There are many situations in which having pre-drilled holes can be useful.

For example, let’s say you need to hold a thermometer precisely in the center of your container while still maintaining an air-tight seal. Having a pre-drilled hole in the center will ensure proper, consistent alignment.

Buchner Funnels (for filtering) can also benefit from this type of stopper. If the holes are too small, they can easily be drilled bigger, allowing them to fit your own, custom applications.

Drill your own?

Not sure if you need holes in your stopper? No worries! You can always just use a cork borer to drill new ones at any time to suit your specific needs.

Rubber stoppers are the most commonly used stoppers in lab applications, and they are highly recommended for every lab to have.

Watch out for leaks!

Be advised that improperly done holes can also cause liquid chemical leaks from your containers if you’re not careful, so make sure that all your fittings – including the rubber bung itself – are snug within the container.

Always use the right size rubber stopper for your application – when in doubt, don’t try to force it!

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