Connector Gaskets describe a type of gasket that has the geometry that would be conducive to a surface found in many connectors. This can be for two reasons. One is the requirement to have an environmental seal. The other being that EMI/RFI shielding capability is required. When it is both, an EMI gasket is usually the perfect solution. However, there are cases where electrically non-conductive materials would be a better choice, such as with an interfacial seal for pin gaskets.
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These gaskets are the conventional type you would see in the back of a computer. These rectangular connectors are normally made out of a EMI gasketing material for both EMI and environmental protection. The standard thickness on these gaskets is .032’’ in thickness. The shell sizes range from 9 to 50 pin.
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These gaskets are available from the slash sheet M83528/4. They are usually circular in shape in the middle with radii on the corners. They can either be slotted or with holes. The M83528/4 is strictly circle diameter screw holes. The standard thickness on these gaskets is .032’’ in thickness. NEDC commonly deals with MIL-DTL-38999 type gaskets.
We thought it would be useful to make a table of different M83528/4 that NEDC traditionally either has in stock or can turn very quickly. The reason for this is these gaskets are so commonly used that any die-cutting manufacturer typically has stock of the steel-rule dies that are required to make these parts.
Breakdown of M83528 numbers
M83528/LLLXDDD
M83528=MIL-DTL-83528 (the overall specification)
LLL=Slash Sheet(in this slash sheet indicating connector gaskets)
X=Material Type, (Several Material Types Available, Type B, and Type D most popular)
DDD=The size (34 sizes available)
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| M83528/004X001 | M83528/004X007 | M83528/004X013 | M83528/004X019 | M83528/004X025 |
| M83528/004X002 | M83528/004X008 | M83528/004X014 | M83528/004X020 | M83528/004X026 |
| M83528/004X003 | M83528/004X009 | M83528/004X015 | M83528/004X021 | M83528/004X027 |
| M83528/004X004 | M83528/004X010 | M83528/004X016 | M83528/004X022 | M83528/004X028 |
| M83528/004X005 | M83528/004X011 | M83528/004X017 | M83528/004X023 | M83528/004X029 |
| M83528/004X006 | M83528/004X012 | M83528/004X018 | M83528/004X024 | M83528/004X030 |
| M83528/004X031 | M83528/004X032 | M83528/004X033 | M83528/004X034 |
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There are many different types of EMI gasketing materials available for use. One of the more common materials NEDC sees is silver/aluminum filler with either fluorosilicone or silicone rubber. These materials are called out in the MIL-DTL-83528 as Type B and Type D. They are the most commonly used gasketing materials for the M83528/004 pin number.
Type D has shielding effectiveness of 90 dB @ 10 GHz. Type D is a Fluorosilicone Rubber material filled with either passivated or non-passivated silver/aluminum particles.
Type B has shielding effectiveness of 100 dB @ 10 GHz. Type B is a Silicone Rubber material filled with silver aluminum particles.
However, the MIl-DTL-83528 provides other different types of materials including Type A, Type C, Type E, Type F, Type J, Type K, Type L, and Type M.
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For more information on connector gaskets please contact sales@nedc.com. NEDC uses waterjet cutting and die cutting to convert gasketing materials into connector gaskets.