EMI Grounding Washers

Series No. 2500

MAJR 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 EMI 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.

Standard Products

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

Table 1 — Grounding Washer Diameters

MAJR Products’ EMI grounding washers (2500 series) are manufactured from knitted wire mesh stocking
For a list of available materials, click here.
Click on any column on the table to sort

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

 

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

Note: *A = Thickness. 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.

 

Table 2 — Flat Washers

MAJR flat washers table diagram

I.D
+/- .015
O.D
+/- .015
THICK
T
MIL SPEC
M83528/012X-( )
MAJR PART NUMBER
.250 .625 0.32 (001) 2603-025063-XX
0.62 (002) 2606-025063-XX
.375 .750 0.32 (003) 2603-038075-XX
0.62 (004) 2606-038075-XX
.500 .656 0.32 (005) 2603-050066-XX
0.62 (006) 2606-050066-XX
.500 .875 0.32 (007) 2603-050088-XX
0.62 (008) 2606-050088-XX
.750 1.000 0.32 (009) 2603-075010-XX
0.62 (010) 2606-075010-XX
1.000 1.438 0.32 (011) 2603-100144-XX
0.62 (012) 2606-100144-XX

Replace xx with the appropriate material code:

XX Material
52 Nickel Graphite
61 Silver-Plated Glass
62 Silver-Plated Copper
63 Silver-Plated Aluminum
64 Silver-Plated Aluminum FluoroSilicone
65 Silver-Plated Nickel
66 Silver

Custom Product


Product Data Sheet

Product Features

EMI grounding washers can be supplied in a resiliency that will return to 90 to 95 percent of free height after deflection of 25 percent.

EMI 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.

Material Options

  • Aluminum
  • Monel
  • FX (Tin/Steel)
  • Silver Brass
  • Be/Cu
  • Stainless Steel