Inhouse Precision Custom Injection, Compression & Transfer Molding

Inhouse Precision Custom Injection, Compression & Transfer Molding

Standard and Custom Rubber Stoppers

For over 70 years, Hawthorne Rubber Manufacturing Corporation has been a supplier of both standard and precision custom-molded rubber stoppers to the exact specifications of OEM, industrial, laboratory, and engineering development groups.

Some of the standard stopper sizes are listed below. Many of these sizes are available with one, two, or three holes for laboratory use. They are manufactured in many different materials in a wide range of durometer hardness.
Standard and Custom Rubber Stoppers
Standard Stopper

Standard Stopper Sizes

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SizeTopBottomHeightHoleTopBottomHeightHole
S-K36.188".063".750"-4.8mm1.6mm19.0mm-
S-K36.188".063".750".085"4.8mm1.6mm19.0mm2.2mm
XXX.313".188".750"-7.9mm4.8mm19.0mm-
XXX.313".188".750".085"7.9mm4.8mm19.0mm2.2mm
XX.375".250".750"-9.5mm6.4mm19.0mm-
XX.375".250".750".085"9.5mm6.4mm19.0mm2.2mm
000.469".344".750"-11.9mm8.7mm19.0mm-
000.469".344".750".085"11.9mm8.7mm19.0mm2.2mm
00.616".404"1.081"-15.6mm10.3mm27.4mm-
0.688".500"1"-17.5mm12.7mm25.4mm-
1.813".547"1"-20.7mm13.9mm25.4mm-
2.875".625"1"-22.2mm15.9mm25.4mm-
3.938".688"1"-23.8mm17.5mm25.4mm-
41.02".781"1"-25.8mm19.8mm25.4mm-
51.06".906"1"-26.9mm23.0mm25.4mm-
61.25"1.00"1"-31.8mm25.4mm25.4mm-
71.50"1.25"1"-38.1mm31.8mm25.4mm-
81.63"1.31"1"-41.4mm33.3mm25.4mm-
91.88"1.50"1"-47.8mm38.1mm25.4mm-
102.00"1.63"1"-50.8mm41.4mm25.4mm-
112.25"1.88"1"-57.2mm47.8mm25.4mm-
11 1/22.4"2.0"1"-60.0mm51.0mm26.0mm-
11 1/22.4"2.0"1".39"60.0mm51.0mm26.0mm10mm
12 1/22.63"2.13"1.25"-66.7mm54.0mm31.8mm-
-2.63"2"2"-66.7mm50.8mm50.8mm-
132.75"2.38"1.13"-69.9mm60.3mm28.6mm-
13 1/23"2.4"1"-75.0mm61.0mm26.0mm-
13 1/23"2.4"1".39"75.0mm61.0mm26.0mm10mm
14--
15--
-4.25"3.5"1.5"-108.0mm88.9mm38.1mm-
-5.25"4.25"2"-133.3mm108.0mm50.8mm-
-6.125"5.5"2".188"155.6mm139.7mm50.8mm4.8mm
The above table dimensions are reference dimensions. Actual dimensions vary based on the material being used. Actual dimensions will be supplied upon request.

Standard 40 Durometer Black SBR (Styrene Butadiene Rubber) Stoppers With Hole

Below is a list of standard stopper sizes with a hole in 40 Durometer Shore A black SBR (Styrene Butadiene Rubber).
Standard Stopper

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SizeTopBottomLengthHole Dia.Estimated
Pcs./Lb.
S-K363/16"1/16"3/4"085"-
XXX5/16"3/16"3/4"085"-
XX3/8"1/4"3/4".085"-
00015/32"3/16"3/4"085"-
00015/32"23/64"45/64"7/64"198
0019/32"25/64"63/64"7/64"100
043/64"33/64"63/64"7/64"75
13/4"35/64"63/64"5/32"65
225/32"5/8"63/64"13/64"50
315/16"23/32"63/64"13/64"40
41 1/64"25/32"63/64"13/64"30
51 1/16"29/32"63/64"13/64"25
5 1/21 3/32"15/16"63/64"13/64"28
61 1/4"1 1/64"63/64"13/64"20
71 29/64"1 3/16"63/64"13/64"15
81 39/64"1 19/64"63/64"13/64"12
91 49/64"1 29/64"63/64"13/64"10
101 31/32"1 21/32"63/64"13/64"8
112 13/64"1 57/64"63/64"13/64"7
11 1/22 31/64"1 31/32"63/64"13/64"6
132 43/64"2 9/32"63/64"13/64"5
13 1/22 61/64"2 7/16"1 3/8"13/64"3
143 35/64"2 61/64"1 17/32"13/64"-
154 3/64"3 17/64"1 17/32"13/64" -
165"3 35/64"1 31/32"13/64" -

Standard 40 Durometer Black SBR (Styrene Butadiene Rubber) Stoppers

Below is a list of standard stopper sizes offered in 40 Durometer Shore A black SBR (Styrene Butadiene Rubber).
Standard Stopper

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SizeTopBottomLengthEstimated
Pcs./Lb.
S-K363/16"1/16"3/4"-
XXX5/16"3/16"3/4"-
XX3/8"1/4"3/4"-
00015/32"3/16"3/4"-
00015/32"23/64"45/64"181
0019/32"25/64"63/64"100
043/64"33/64"63/64"75
13/4"35/64"63/64"65
225/32"5/8"63/64"50
315/16"23/32"63/64"40
41 1/64"25/32"63/64"30
51 1/16"29/32"63/64"25
5 1/21 3/32"15/16"63/64"26
61 1/4"1 1/64"63/64"20
71 29/64"1 3/16"63/64"15
81 39/64"1 19/64"63/64"12
91 49/64"1 29/64"63/64"10
101 31/32"1 21/32"63/64"8
112 13/64"1 57/64"63/64"7
11 1/22 31/64"1 31/32"63/64"6
132 43/64"2 9/32"63/64"5
13 1/22 61/64"2 7/16"1 3/8"3
143 35/64"2 61/64"1 17/32"-
154 3/64"3 17/64"1 17/32"-
165"3 35/64"1 31/32"-

Standard 45 Durometer Translucent Silicone Rubber Stoppers

Below is a list of standard stopper sizes offered in 45 Durometer Shore A translucent Silicone rubber. These stoppers can be sterilized and are perfect for labs, biotech, and pharmaceutical industries. The maximum temperature is 500 °F. They meet FDA and USDA standards.
Standard Stopper

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SizeTopBottomLength
0019/32"13/32"63/64"
021/32"33/64"63/64"
13/4"35/64"1 1/64"
225/32"5/8"63/64"
361/64"23/32"63/64"
41 1/64"51/64"61/64"
51 1/16"29/32"31/32"
61 1/4"1 1/32"29/32"
71 29/64"1 3/16"61/64"
81 39/64"1 9/32"1"
91 49/64"1 15/32"63/64"
101 31/32"1 21/32"59/64"

55 Durometer Silicone Rubber Stoppers

The stoppers listed below are ideal for high-temperature applications. They are made out of a 55 Durometer Shore A in Silicone rubber.

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Part NumberLarge EndSmall EndLengthColor
S-K41 SI-551/8"1/32"5/8"Translucent
S-K35 SI-551/8"1/16"5/8"Light Green
S-K36 SI-553/16"1/16"3/4"Pink
S-K37 SI-551/4"1/8"3/4"Black
S-XXX SI-555/16"3/16"3/4"Red - Orange
S-K38 SI-5511/32"3/16"5/8"Dark Red
S-XX SI-553/8"1/4"3/4"Yellow
S-000 SI-5515/32"3/16"3/4"Red - Orange
S-K52 SI-551/2"5/16"13/16"Translucent
S-K53 SI-555/8"7/16"13/16"Light Green
S-K54 SI-553/4"9/16"1"Black
S-3 SI-5515/16"23/32"1"Yellow
S-4 SI-551 1/64"25/32"1"Translucent
S-6 SI-551 17/64"1 1/32"1"Dark Green
S-8 SI-551 39/64"1 5/16"1"Translucent
S-9 SI-551 49/64"1 15/32"1"Red
S-10 SI-551 31/32"1 5/8"1"Translucent
S-11 SI-552 13/64"1 7/8"1"Dark Blue
S-11 1/2 SI-552 31/64"1 31/32"1"Rusty Red
S-K68 SI-552 23/64"2 1/8"1"Red
S-13 1/2 SI-552 61/64"2 7/16"1 3/8"Rusty Red
S-14 SI-553 35/64"3"1 1/2"Rusty Red
S-15 SI-554 3/64"3 1/4"1 1/2"Rusty Red
S-16 SI-555"3 1/2"2"Rusty Red

If you don’t see the stopper size you are looking for, just ask us, and we will quote you. We supply standard and custom stoppers in a wide range of materials, including Fluorocarbon (both Fluorel and Viton®), Fluorosilicone, Silicone, Urethane, Nitrile, Neoprene, EPR, SBR, and Natural Rubber. We mold stoppers in translucent, colored, or black rubber. Some compounds can conduct electricity, or be used in FDA, dental, or pharmaceutical applications.

Stopper Request for Quote Form

Please enter your name, company name, phone number, and a valid e-mail. The RFQ lot size is also a required field. We will need to know how many you need in order to develop a quotation for you.
The balance of the information is to be entered if it applies to your request.
Thank you for your inquiry. We look forward to supplying your future rubber product requirements.