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
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
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.