Flexi Shields
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This patented spiral is the best low cost EMI gasket solution. The spiral is wound out of spring temper stainless steel for excellent spring memory and compression set resistance. The stainless steel spiral exhibits moderate to high shielding properties at a very low cost. See below for ordering information.

Application Information

The low cost and moderate shielding of this gasket offer an excellent solution for meeting FCC and European Community EMI requirements. Combining it with a die-cast or molded “pinch boss” groove gives you the optimal price/performance combination. Contact us for design details.

Spiral: Stainless steel. Refer to Material Specifications for more information.

Shielding Quality:
This gasket offers shielding quality in excess of 95 dB at 1 GHz. The shielding quality may vary depending on the specific application. Refer to Shielding Quality  for more complete performance data.

Compression Force:
Quick-Shield gaskets come in three different resiliencies (as shown below). Optimal compression of the gasket is 25% of the diameter of the spiral. Since the force to compress the gasket is a function of the cube of the thickness of the stainless steel ribbon, the compression forces shown are approximate.
Standard Force: ~30 pounds per linear inch compression.
Moderate Force: ~10 pounds per linear inch compression.
Low Force: ~1.5 pounds per linear inch compression.

This gasket is groove mounted. Refer to Groove Mounting Techniques for detailed mounting information.

Available Options

Cord Insert:
To keep costs low, we recommend you omit the cord usually used in the spiral. However, if over-compression of the gasket is a concern or problem, remove the “NC” from the part number on the moderate and low force series gaskets.

Example: NM-06 NC will come without a cord. NM-06 will include cord.
All Standard Force gaskets come without cord (no NC required).

Custom Sizes:
We can manufacture Quick-Shield gaskets in any size diameter, from .034” up to approximately 1.5”. There are no special tooling charges involved, but the functional length of the part may be short at very large diameters. Please contact us with your requirements.

For plating options, see Ultra Quick-Shield.

Ordering Information:
Quick-Shield is sold by the foot and typically packaged on spools except in small quantities. It can also be ordered cut-to-length in specific sizes at a low cost, or you can cut it yourself using a sharp pair of scissors. Custom o-rings are also available. (See Custom Gaskets for more information.)


Quick-Shield Part Numbers
(Stainless Steel)
Recommended Groove Dimensions
Diameter Standard* Force Moderate Force Low Force Depth (L)
Width (G)
Width (W)
.034" ± .002" NI-02 -- -- .023" .046" .033”
.047" ± .002" NI-03 NM-03 NC -- .035" .063" .045”
.063" ± .003" NI-04 NM-04 NC NL-04 NC .046" .094" .060”
.070" ± .003" NI-.070 NM-.070 NC NL-.070 NC .053" .094" .067”
.078" ± .003" NI-05 NM-05 NC NL-05 NC .059" .109" .075”
.094" ± .004" NI-06 NM-06 NC NL-06 NC .070" .125" .090”
.103" ± .004" NI-.103 NM-.103 NC NL-.103 NC .077" .141" .099”
.109" ± .004" NI-07 NM-07 NC NL-07 NC .082" .156" .105”
.125" ± .004" NI-08 NM-08 NC NL-08 NC .094" .171" .121”
.139" ± .005" NI-.139 NM-.139 NC NL-.139 NC .104" .187" .134”
.141" ± .005" NI-09 NM-09 NC NL-09 NC .105" .187" .136”
.172" ± .005" NI-11 NM-11 NC NL-11 NC .128" .234" .165”
.187" ± .006" NI-12 NM-12 NC NL-12 NC .140" .250" .181”
.250" ± .007" NI-16 NM-16 NC NL-16 NC .185" .343" .240”
.312" .009" NI-20 NM-20 NC NL-20 NC .234" .422" .300”

* Standard force gaskets come without a cord.

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

drawing of shield

standard o-ring groove

Spira Shield (second image)

dovetail groove

See Groove Mounting Techniques for complete mounting details.

More information is also available on Dovetail Groove Cutters.