Flexi Shields
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Spira's Flexi-Shield and Spira-Seal O-Rings are designed to provide an EMI seal for the life of a system, and are ideal for use in jam-nut connectors. In actual use, these gaskets have achieved up to 1,000 insertions! See below for ordering information. Please also see Custom Gaskets for O-Rings from other spiral gasket material or in custom sizes.

Application Information

These gaskets are a one-on-one replacement for military "AS" series o-rings. The dash numbers of the gaskets in the table are dimensionally interchangeable with AS568 o-ring dash numbers. Custom size o-rings are also available.  Please refer to Custom Gaskets  for more information.

Materials:
These o-rings are made out of our standard force Endur-o-Shield or Flexi-Shield gasket material. The solid core or tubing makes it extremely durable, especially in sliding applications like connectors.
Spiral: Tin/lead plated beryllium copper. (See Options for RoHS compliance.)
Core: Flexi-Shield: 35 durometer silicone tubing.
          Spira-Seal: cured silicone adhesive.

Refer to Material Specifications for more information.

Shielding Quality:
Spira-Seal or Flexi-Shield O-Rings offer shielding quality from 116 dB to 152 dB.
The shielding quality of each type may vary depending on your specific application. Refer to Shielding Quality for more complete performance data. Refer to Shielding Quality  for more complete performance data.

Compression Force:
Spira-Seal or Flexi-Shield standard O-Rings require approximately 30 pounds per linear inch to compress properly. Optimal compression of the gasket is 25% of the diameter of the spiral.

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: IWSSOG-B-050)
EIW: RoHS compliant edge tin plating for high humidity or salt-fog

O-Ring
Force
Tin/Lead Plating
RoHS Tin
Edge Tin/Lead
RoHS Edge Tin
Spira-Seal
Standard
SSOG (default)
IWSSOG
ESSOG
EIWSSOG
Flexi-Shield
Standard
FSOG
IWFSOG
EFSOG
EIWFSOG

Specify a different spiral material by choosing the desired prefix from the table.

Example: IWFSOG-B-220; RoHS tin plated, Flexi-Shield O-Ring
Refer to Material Compatibility for more information.

Core Material:
The core for Flexi-Shield O-Rings (FSOG) is commercial grade silicone tubing.
Fluorosilicone is also available by request.
The standard core for Spira-Seal O-Rings (SSOG) is silicone.
A special core can be requested for SSOG O-Rings (as shown below):

-F: Fluorosilicone (Example: ESSOG-B-050-F)
-O: Space Qualified Silicone (non-outgassing)
-Z: Silicone which is a non-acetic acid adhesive (per MIL-A-46146)

Note: An EMI/Environmental O-Ring is in development. Contact us for details.

Ordering Information:
O-Rings are ordered by the piece. Custom size o-rings are also available. (See Custom Gaskets for more information.)

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

Spira O-Ring
Spira O-Ring
See  Mounting Techniques for more information.

Spira Spiral
Outer Conductive Spiral
(Tin/Lead Plated Beryllium Copper)


Resilient Inner Core 
(Solid Silicone) - SSOG
or Silicone Tubing - FSOG

 
Recommended Groove Dimensions
W Diameter
Depth
Width
.070"
.053"
.094"
.103"
.077"
.141"
.139"
.104"
.187"

Dash No.
Dimensions
W Dia. Tol. ID Tol.
011
012
013
014
015
016
017
018
019
020
021
022
023
024
025
026
027
028
029
030
031
032
033
.070" ±.003  .301"
 .364"
 .426"
 .489"
 .551"
 .614"
 .676"
 .739"
 .801"
 .864"  .926"  .989" 1.051" 1.114" 1.176" 1.239" 1.301" 1.364" 1.489" 1.614" 1.739" 1.864" 1.989"
±.020"
034
035
036
037
038
039
040
041
042
043
044
045
046
047
048
049
050
.070" ±.003" 2.114"
2.239"
2.364"
2.489"
2.614"
2.739"
2.864"
2.989"
3.239"
3.489"
3.739"
3.989"
4.239"
4.489"
4.739"
4.989"
5.239"
±.030"
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
.103" ±.004"  .424"
 .487"
 .549"
 .612"
 .674"
 .737"
 .799"
 .862"
 .924"
 .987"
1.049"
1.112"
1.174"
1.237"
1.299"
1.372"
1.299"
1.487"
1.549"
1.612"
1.674"
1.737"
1.799"
1.862"
1.925"
1.987"
±.020"
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
.103" ±.004" 2.050"
2.112"
2.175"
2.237"
2.300"
2.362"
2.425"
2.487"
2.550"
2.612"
2.675"
2.737"
2.800"
2.862"
2.987"
3.237"
3.487"
3.737"
±.030"

 
 
Dash No.
Dimensions
W Dia. Tol. ID Tol.
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
.103" ±.004" 3.987"
4.237"
4.487"
4.737"
4.987"
5.237"
5.487"
5.737"
5.987"
6.237"
6.487"
6.737"
6.987"
7.237"
7.487"
7.737"
7.987"
8.237"
8.487"
±.035"
174
175
176
177
178
.103" ±.004" 8.737"
8.987"
9.237"
9.487"
9.737"
±.040"
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
.139" ±.005"  .734"
 .796"
 .859"
 .921"
 .984"
1.046"
1.109"
1.171"
1.234"
1.296"
1.359"
1.421"
1.484"
1.609"
1.734"
1.859"
 1.984"
 2.109"
 2.234"
 2.359"
 2.484"
 2.609"
 2.734"
 2.859"
 2.984"
±.020
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
.139" ±.005"  3.109"
 3.234"
 3.359"
 3.484"
 3.609"
 3.734"
 3.859"
 3.984"
 4.109"
 4.234"
 4.359"
 4.484"
 4.609"
 4.734"
 4.859"
 4.984"
±.030"
251
252
253
254
255
256
257
.139" ±.005"  5.109"
 5.234"
 5.359"
 5.484"
 5.609"
 5.734"
 5.859"
±.035"
258
259
260
261
262
263
264
265
266
267
268
269
270
.139" ±.005"  5.984"
 6.234"
 6.484"
 6.734"
 6.984"
 7.234"
 7.484"
 7.734"
 7.984"
 8.234"
 8.484"
 8.734"
 8.984"
±.040"
271
272
273
274
275
276
.139" ±.005"  9.234"
 9.484"
 9.734"
 9.984"
10.484" 10.984"
±.045"
277
278
279
280
281
282
283
284
.139" ±.005" 11.484" 11.984" 12.984" 13.984" 14.984" 15.955" 16.955" 17.955" ±.050"