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EMI Grounding Washers

emi_grounding_washersMAJR Products’ EMI grounding washers (2500 series) are manufactured from knitted wire mesh stocking that is formed into a resilient metal washer by compressing in a close-tolerance forming die. The grounding washer can be supplied in various diameters and thicknesses to satisfy the many requirements as indicated in the Applications shown in Figures 1 through 4.

Applications

Figures 1 through 4 show some of the possible mounting methods for grounding washers.

emi_grounding_washers_01

By varying the weight of the stocking mesh inserted into the compression die, the density of the washers can be varied, thus increasing or decreasing unit resilience, depending on the needs of the specific application. Washers with a metal density of 15 to 20 percent will “flow” under compression and thus will fill a gap or seam under minimal pressure (10 psi).

Grounding washers, when designed into applications that require recovery after the unit has been deflected, can be sup-plied in a resiliency that will return to 90 to 95 percent of free height after deflection of 25 percent.

A grounding washer with a metal density of 30 to 40 percent provides a snug fit around a shaft or rod, but when compressed against the wall of a metal enclosure (as shown in Figure 3) will act as a slip-ring thus grounding the rotating shaft to enclosure. This eliminates the possibility of the shaft acting as an antenna to radiate or pick up unwanted noises.

The all-metallic construction of the grounding washers that can be supplied in varying alloys makes them especially effective in hostile environments of temperature or chemicals.

 

Available Sizes

Table 1 — Grounding Washer Diameters

emi_grounding_washers_02

Part Number O.D. I.D.
250A-70005-xx 0.218 0.062
250A-70007-xx 0.375 0.250
250A-70009-xx 0.030 0.000
250A-70010-xx 1.000 0.500
250A-70015-xx 0.234 0.109
250A-70020-xx 0.500 0.250
250A-70027-xx 0.635 0.500
250A-70076-xx 1.120 0.810
250A-70078-xx 0.906 0.593
250A-70084-xx 1.370 1.120
250A-70092-xx 0.750 0.228
250A-70094-xx 0.062 0.000
250A-70106-xx 1.425 1.043
250A-70108-xx 1.437 1.063
250A-70110-xx 1.437 1.102
250A-70115-xx 0.255 0.150
250A-70117-xx 0.885 0.625
250A-70118-xx 0.630 0.550
250A-70119-xx 1.380 1.250
250A-70120-xx 0.380 0.250
250A-70121-xx 0.880 0.810
250A-70122-xx 0.635 0.375
250A-70134-xx 0.937 0.687
250A-70135-xx 0.625 0.469
250A-70136-xx 1.620 1.125
250A-70137-xx 2.130 1.600
250A-70144-xx 0.875 0.375
250A-70145-xx 0.345 0.185
250A-70150-xx 2.125 1.812
250A-70158-xx 1.500 1.000
250A-70160-xx 2.950 2.875
250A-70180-xx 0.910 0.790
250A-70200-xx 0.750 0.250
250A-70310-xx 0.410 0.250
250A-70320-xx 0.350 0.175
250A-70350-xx 0.906 0.344
250A-70360-xx 0.550 0.200
250A-70500-xx 0.875 0.344
250A-70501-xx 0.875 0.315
250A-70502-xx 0.275 0.180
250A-70503-xx 0.300 0.150
250A-70504-xx 0.240 0.187
250A-70600-xx 1.370 0.750
250A-70650-xx 2.625 0.450
250A-70700-xx 0.500 0.200
250A-70710-xx 0.450 0.170
250A-70720-xx 1.250 0.315
250A-70730-xx 1.880 0.680
250A-70740-xx 1.000 0.300
250A-70750-xx 1.800 0.480
250A-70755-xx 1.100 0.315
250A-70756-xx 0.900 0.480
250A-70800-xx 0.394 0.323
250A-70950-xx 1.375 1.125

Note: *A=Thinkness. Thickness needs to be specified at the time of request. *xx: See table 2 for material codes

Table 1 shows
washer sizes that can readily be supplied from existing tooling.
Thickness can be varied from .032 to .125.

Materials

Grounding washers can be supplied using knit wire mesh of the
following materials:

Table 2

Code Description.
-31 Monel per QQ-N-281 Class A
-32 Aluminum
-33 Silver Plated Brass per QQ-W-321 (3% Silver by Weight)
-34 Tin Plated Copper Clad Steel per ASTM B520
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