EMI Connector Gaskets

SSP fabricates EMI connector gaskets from the EMI/RFI shielding silicones we produce at our Made in USA manufacturing facility.  

Many of our elastomers are MIL-DTL-83528 QPL certified (MIL-G-83528) and part of the M83528 QPL from the U.S. DoD DLA.

As a vertically integrated manufacturer, we also have an in-house toolroom. Choose SSP instead of Parker Chomerics CHO-SEAL.  

EMI Connector Gasket Materials

SSP makes EMI/RFI shielding silicones and fabricates EMI connector gaskets from the materials we produce and the tools we machine. Use SSP’s electrically conductive silicones instead of Parker Chomerics CHO-SEAL materials.

CHO-SEAL 1298 alternative

MIL-DTL-83528 Type D

CHO-SEAL 1287 and CHO-SEAL 1298 alternative. SSP2486-70 is a 70-durometer silver-aluminum EMI shielding fluorosilicone. MIL-DTL-83528 Type D. QPL listed.

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M83528 EMI Connector Gasket Sizes

SSP makes flange-mount EMI connector gaskets that are square shaped and come in M83528 part sizes. Depending on the EMI gasket quantities you need, SSP can use flash cutting or die cutting to produce them. Additional sizes available upon request.

MIL-DTL-83528 Part Number

Dimensions

Connector Shell Size

A
± .010

B
± .020 – .000

C
± .015

D
± .010

M83528/004×001

.469

11.91

.375

9.53

.738

18.75

.141

3.58

6

M83528/004X002

.594

15.09

.630

16.00

.840

21.34

.135

3.43

8

M83528/004X003

.594

15.09

.568

14.43

.812

20.62

.125

3.18

8

M83528/004X004

.594

15.09

.500

12.70

.875

22.23

.156

3.96

8

M83528/004X005

.719

18.26

.750

19.05

.965

24.51

.135

3.43

9,10

M83528/004X006

.719

18.26

.680

17.27

.937

23.80

.125

3.18

10

M83528/004X007

.719

18.26

.625

15.88

1.000

25.40

.156

3.96

10S, SL

M83528/004X008

.812

20.62

.875

22.23

1.060

26.92

.141

3.58

11,12

M83528/004X009

.813

20.65

.750

22.10

1.094

27.79

.141

3.58

12,12S,SL

M83528/004X010

.906

23.01

1.005

25.53

1.153

29.29

.135

3.43

13,14

M83528/004X011

.906

23.01

.938

23.83

1.125

28.58

.125

3.18

14

M83528/004X012

.906

23.01

.875

22.23

1.188

30.18

.156

3.96

14,14S

M83528/004X013

.969

24.61

1.135

28.83

1.258

31.95

.156

3.96

15,16

M83528/004X014

.969

24.61

1.063

27.00

1.250

31.75

.125

3.18

16

M83528/004X015

.969

24.61

1.000

25.40

1.281

32.54

.156

3.96

16,16S

M83528/004X016

1.062

26.97

1.260

32.00

1.351

34.32

.156

3.96

17,18

M83528/004X017

1.062

26.97

1.189

30.20

1.343

34.11

.125

3.18

18

M83528/004X018

1.062

26.97

1.135

28.83

1.375

34.93

.156

3.96

18,18S

M83528/004X019

1.156

29.36

1.375

34.93

1.500

38.10

.141

3.58

19,20

M83528/004X020

1.156

29.36

1.312

33.32

1.467

37.26

.125

3.18

20

M83528/004X021

1.156

29.36

1.250

31.75

1.500

38.10

.172

4.37

20

M83528/004X022

1.250

31.75

1.500

38.10

1.625

41.28

.141

3.58

21,22

M83528/004X023

1.250

31.75

1.437

36.50

1.562

39.67

.125

3.18

22

M83528/004X024

1.250

31.75

1.375

34.93

1.625

41.28

.172

4.37

22

M83528/004X025

1.375

34.93

1.625

41.28

1.750

44.45

.172

4.37

23,24

M83528/004X026

1.375

34.93

1.563

39.70

1.703

43.26

.152

3.86

24

M83528/004X027

1.375

34.93

1.500

38.10

1.750

44.45

.203

5.16

24

M83528/004X028

1.500

38.10

1.750

44.45

1.875

47.63

.172

4.37

25

M83528/004X029

1.562

39.67

1.750

44.45

2.000

50.80

.203

5.16

28

M83528/004X030

1.750

44.45

2.000

50.80

2.250

57.15

.219

5.56

32

M83528/004X031

1.938

49.23

2.250

57.15

2.500

63.50

.219

5.56

36

M83528/004X032

2.188

55.58

2.500

63.50

2.750

69.85

.219

5.56

40

M83528/004X033

2.375

60.33

2.781

70.63

3.000

76.20

.219

5.56

44

M83528/004X034

2.625

66.68

3.031

76.99

3.250

82.55

.219

5.56

48

M83528/004X035

.500

12.70

.437

11.10

.800

20.32

.135

3.43

 

M83528/004X036

.500

12.70

.437

11.10

687

17.45

.135

3.43

 

Connector Gaskets with EMI Shielding

An EMI connector gasket is designed to reduce or eliminate the transmission of electromagnetic interference (EMI) between connected devices, or through the connector itself.

These devices are used in environments where EMI can cause problems, such as in military, aerospace, telecommunications, medical devices, and other sensitive electronic systems. Specialty Silicone Products (SSP) makes EMI gaskets for these and other applications.

What to Consider When Choosing an EMI Connector Gasket

  • Connector Type: Ensure compatibility with the specific connector geometry (e.g., D-sub, BNC, circular, etc.).
  • Shielding Effectiveness: Depends on the material and the frequency range of EMI to be blocked.
  • Durability: Resistance to environmental factors like moisture, temperature, and corrosion.
  • Compression and Reusability: Gaskets that can withstand repeated mating/unmating cycles without losing performance.
  • Cost: Material and customization can impact price.

EMI Connector Types

There are many product types including coaxial, D-subminiature (D-sub), circular, and more. They can be used for data transmission, power supply, and signal transfer.  Here are some examples.

  • D-Sub Connector Gaskets: D-sub connectors are commonly used in industrial and computing applications. EMI gaskets for D-sub connectors include:

  • BNC Connector Gaskets: BNC connectors are commonly used for RF (Radio Frequency) and video signal applications. 
  • Circular Connector Gaskets: For connectors like MIL-DTL-38999, M12, or other circular connectors:
  • Compression Gaskets: Designed to fit between mating surfaces for improved EMI shielding and environmental sealing.

EMI Shielding Effectiveness

An EMI connector gasket is typically designed with metal or other conductive materials to provide shielding that blocks electromagnetic waves. This shielding helps prevent interference from both external sources and from the connector’s internal components.

Electrical Grounding

Many products have grounding features that ensure a low-impedance path to ground. This helps dissipate any electromagnetic energy that might otherwise cause interference.

Filtering Against Electronic Noise

An EMI connector gasket may incorporate filters (such as capacitors or ferrites) that suppress high-frequency electronic noise. These filters are integrated into the device itself and provide additional protection against EMI.

Sealed Enclosures

Sealing reduces the likelihood of gaps where EMI could leak in or out. They are used in situation where maintaining signal integrity is critical, such as military communications, aerospace electronics, medical devices, industrial equipment, and high-speed data networks.

SSP Makes EMI Connector Gaskets

Specialty Silicone Products makes EMI gaskets that meet the requirements of MIL-DTL-83528, a U.S. military detail specification for elastomeric gasket materials that provide EMI shielding. Note that die-cut flange-mount products are square and come in many different sizes.