Flexi Shields
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Ultra Quick-Shield offers excellent shielding at an affordable price. The spiral is wound out of low cost spring temper stainless steel for excellent spring memory and compression set resistance. The spiral is tin plated for superior conductivity and shielding properties. See below for ordering information.

Application Information

The affordable cost and superior shielding of this gasket makes it an excellent choice for high end commercial applications. Combining it with a die-cast or molded “pinch boss” groove gives you the optimal price/performance combination. Contact us for design details.

Spiral: Tin/lead plated stainless steel. (See Options for RoHS compliance).
Electroplated, 90% tin, 10% lead per AMS-P-81728 (edges unplated). Refer to Material Specifications for more information.

Shielding Quality:
These gaskets can offer shielding quality in excess of 150 dB at frequencies between 100 kHz and 1 GHz. The shielding quality may vary depending on the specific application. Refer to page 45 for complete performance data. Refer to Shielding Quality for  complete performance data.

Compression Force:
Ultra 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

To specify tin plating for RoHS compliance, replace the “T” with “IW” at the beginning of the part number. Please note that additional plating charges may apply.
IW: RoHS compliant tin plating (Example: IWNL-06 NC)

No Plating
Tin/Lead Plating
RoHS Tin Plating
Edge Tin Plating
TNI (default)

This gasket is not recommended for high humidity or salt-fog applications because the edges of the gasket are not plated. If high humidity or salt-fog environments are to be encountered, the edge plated version of our Spira-Shield gasket is recommended. Please contact us with your questions.

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

Custom Sizes:
We can manufacture Ultra 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.

Ordering Information:
Ultra 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.)

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

* Standard force gaskets come without a cord. ** These gaskets cannot come with a cord.
** These sizes are non-stock items and may include additional plating charges.

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.