Flexi Shields
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Spira’s EMI-only Connector-Seal gaskets are designed to provide an EMI seal in flange-mounted connectors for the life of a system. These gaskets are extremely durable, and have achieved up to 1,000 insertions in actual use. See below for ordering information. Also note that Spira has a NEW patent-pending EMI & Environmental Connector-Seal gasket.

Application Information

Connector-Seal gaskets are made by attaching a spiral gasket to a retaining frame. The retaining frame provides a positive stop and holds the gasket material in place to provide an EMI seal and prevent deformation of the material.

The “CS” EMI-Only Connector-Seal is a more durable, cost effective replacement of Spira’s original Connector-Seal (SSCG) and can be either back or front-mounted. The “CS” EMI-Only gasket is similar to the EMI & Environmental Connector-Seal (ECS), but due to frame dimensions it does not provide Environmental sealing.

When choosing a gasket, select an inside diameter that easily clears the connector barrel. The shielding is achieved by making contact between the two joint surfaces, not by touching the barrel.

Materials:
CS Frame: Silicone or Fluorosilicone sealing over a stainless steel frame.
CS Spiral: Spira-Shield standard force tin/lead plated beryllium copper.
SSCG Frame: Chem-film plated aluminum.
SSCG Spiral: Enduro-Shield moderate force tin/lead plated beryllium copper.
SSCG Core: Cured silicone adhesive.
(See Options for RoHS compliance).
Refer to Material Specifications for more information.

Shielding Quality:
EMI Connector-Seal gaskets offer shielding quality from 116 to 152 dB. The shielding quality may vary depending on your specific application. Refer to Shielding Quality for more complete performance data.

Compression Force:
Optimal compression of the gasket is 25% of the diameter of the spiral. The compression force stated is approximate. When installing the gasket, care must be taken to clear the mounting pins one at a time.

CS Series: ~30 pounds per linear inch compression force required.
SSCG Series: ~10 pounds per linear inch compression force required.

Spira connector Seal

Available Options

Plating:
The gasket is electroplated, 90% tin, 10% lead per AMS-P-81728 (edges unplated). Plating options can be specified by adding a prefix before the part number:
E: Edge tin/lead plating (includes edges) for high humidity or salt-fog environments
IW: RoHS compliant tin plating (Example: IWSSCG-B-21-O)
EIW: RoHS compliant edge tin plating for high humidity or salt-fog
Refer to Material Compatibility for more information.

SSCG Core Material:
The SSCG uses a Spira-Seal gasket with a standard core of solid silicone adhesive.
A special core can be specified by adding an option to the end of the part number:
-F: Fluorosilicone (Example: SSCG-B-21-O-F)
-O: Silicone that meets outgassing requirements
-Z: Silicone which is a non-acetic acid adhesive (per MIL-A-46146)
Contact us for more information.

Frame:
An alternate frame is available including stainless steel sealed on both sides by silicone or fluorosilicone elastomeric material. This is still EMI-only protection due to the sizing.

Frame:
Options
Tin/Lead
Plated Gasket
RoHS Tin
Plated Gasket
Edge Tin/Lead
Plated Gasket
RoHS Edge Tin
Plated Gasket
Elastomeric Frame Material
Silicone
Fluorosilicone
CS-T-__ /S
CS-T-__ /F
CS-IW-__ /S
CS-IW-__ /F
CS-E-__ /S
CS-E-__ /F
CS-EIW-__ /S
CS-EIW-__ /F
Chem-Film Aluminum
n/a
SSCG-B-__-O
IWSSCG-B-__-O
ESSCG-B-__-O
EIWSSCG-B-__-O

Specify frame and other options by choosing the desired prefix from the table.

Example: CS-E-14 /S; EMI Connector-Seal, Edge tin/lead plated gasket, Silicone frame

EMI Connector Seal Optional Frame
EMI Connector-Seal Aluminum Frame

Ordering Information

Connector-Seal gaskets are ordered by the piece.

See our Part Number Matrix for assistance with part numbers, options and product comparisons.

Spira Connector Flat 1
Spira Connector Flat 2
Spira Connector Seal ECS2
  SSCG Series CS Series

Dash No. For Use With Connectors
A
B
C
D
MIL-C-26482, 26500, 83723 Series 1 & 3 NAS 1599 "B" & "T" Size MIL-C-38999 MIL-C-81703
Size
1 & 2
Size
3 & 4
Size
±.005"
+.010"
-.005"
±.020"
+.010"
-.005"

01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
28
29
32
33
34
35
39
40

8

10

12

14

16

18
 

20

22
24

 
 
 
 
 
32
 
 

36
 
8

9 & 10

11 & 12

13 & 14

15 & 16

17 & 18

 
19 & 20

21 & 22
23 & 24
 

25
 
 
 
 
 
 
 
 


9

10 & 11

12 & 13

14 & 15

16 & 17
 

18 & 19

20 & 21
22 & 23
 

24 & 25
 
 
 
 
 

24 & 25
 

3
7
 

12
19

27
 

 
37

 
 
 
 
61
 
 
 
 
 
 
 
 
 
 .594"
 .625"
 .719"
 .798"
 .812"
 .812"
 .906"
 .928"
 .969"
 .978"
1.062"
1.140"
1.187"
1.156"
1.238"
1.250"
1.375"
1.392"
1.436"
1.500"
1.568"
1.716"
 .753"
1.750"
1.062"
1.938"
1.500"
1.938"
1.750"
1.187"
1.437"
 .562"
 .623"
 .687"
 .883"
 .812"
 .828"
 .947"
1.070"
1.063"
1.133"
1.187"
1.325"
1.325"
1.312"
1.508"
1.437"
1.562"
1.633"
1.570"
1.682"
1.830"
2.030"
 .771"
2.062"
1.250"
2.186"
1.682"
2.312"
1.846"
1.437"
1.726"
 .937"
1.000"
1.062"
1.200"
1.156"
1.200"
1.200"
1.375"
1.375"
1.437"
1.437"
1.625"
1.562"
1.563"
1.825"
1.687"
1.825"
1.937"
1.825"
1.937"
2.250"
2.375"
1.100"
2.312"
1.437"
2.550"
1.850"
2.600"
2.250"
1.687"
1.880"
.125"
.125"
.125"
.125"
.125"
.125"
.125"
.125"
.125"
.125"
.125"
.125"
.125"
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.125"
.125"
.152"
.152"
.125"
.152"
.152"
.173"
.125"
.173"
.125"
.173"
.152"
.173"
.173"
.125"
.125"

EMI Connector-Seal Spiral