Hardware and gasket details
Nuts and screws
Nuts: stainless steel, aluminum alloy or brass. Screws: specified sizes, lengths and threads with corrosion-resistant construction.
Washers and shims
High-strength washers distribute load and increase bearing area. Shims are offered in requested thicknesses and materials for alignment and dimensional adjustment.
Gaskets
Conductive and non-conductive options. Five profiles and the 873/877 material rows appear below; shielding entries describe materials, not a certified assembled joint.

Gasket profile drawings

Quality assurance
Specifications and configuration details
Type 1 waveguide flat gasket size inch [mm]
| A ± 0.15[0.38] | B ± .015[0.38]-0 | C ± .015[0.38]-0 | D ± .015[0.38] | H ± .010[0.25] | T ± .015[0.13] | Product Code |
|---|---|---|---|---|---|---|
| .750[19.05] | .750[19.05] | .145[3.68] | .285[7.24] | .116[2.95] | .027[0.69] | 87-87000 |
| .875[22.23] | .875[22.23] | .175[4.45] | .425[10.80] | .116[2.95] | .027[0.69] | 87-87001 |
| 1.313[33.35] | 1.313[33.35] | .630[16.00] | .128[8.13] | .140[3.56] | .027[0.69] | 87-87002 |
Type 2 waveguide flat gasket size inch [mm]
| A ± 0.15[0.38] | B ± .015[0.38]-0 | C ± .015[0.38]-0 | H ± .010[0.25] | T ± .015[0.13] | Product Code |
|---|---|---|---|---|---|
| 3.125[79.38] | .632[16.05] | 1.382[35.10] | .234[5.84] | .027[0.69] | 87-87007 |
| 3.625[92.08] | .882[22.40] | 1.882[47.80] | .234[5.94] | .027[0.69] | 87-87010 |
| 5.312[134.93] | 1.350[34.29] | 2.850[72.39] | 2.90[7.37] | .027[0.69] | 87-87012 |
Type 3 waveguide flat gasket size inch [mm]
| A ± 0.15[0.38] | B ± .015[0.38]-0 | T ± .015[0.13] | Product Code |
|---|---|---|---|
| 1.368[34.75] | .868[22.05] | .103[2.62] | 87-83005 |
| 1.616[41.05] | .991[25.17] | .103[2.62] | 87-83008 |
Type 4 waveguide flat gasket size inch [mm]
| A ± 0.15[0.38] | T ± .015[0.13] | Product Code |
|---|---|---|
| 2.001[51.08] | .123[3.12] | 87-83009 |
| 2.683[68.15] | .115[2.92] | 87-83011 |
Type 5 waveguide flat gasket size inch [mm]
| A ± 0.15[0.38] | B ± .015[0.38]-0 | T ± .015[0.13] | Product Code |
|---|---|---|---|
| .410[10.41] | .065[1.42] | .082[2.08] | 87-83000 |
| .587[14.91] | .048[1.22] | .078[1.98] | 87-83001 |
Printed values and tolerances are preserved, including apparent inch/mm inconsistencies. Confirm the controlled drawing before manufacture or purchase.
Gasket material properties
| Material | Magnetic Field 100KHz | Electric Field 10MHz | Plane Wave 1GHz | Plane Wave 10GHz | Colour | Hardness | Body Resistance | Tear Strength |
|---|---|---|---|---|---|---|---|---|
| 873 | 75dB | 130+dB | 115dB | 110dB | Gray | 85 ± 7 | 0.005 Ω-cm | 2.7MPa |
| 877 | 75dB | 130+dB | 115dB | 110dB | Red | 80 ± 7 | 0.007 Ω-cm | 4.05MPa |
Gasket shape key
| Type | Published description |
|---|---|
| Type1 | Die cut square |
| Type2 | Die-cut round |
| Type3 | Molded square with “O” shaped cross section |
| Type4 | Molded round with “O” shaped cross section |
| Type5 | Molded round with “D” shaped cross section |
Ordering information: DH – 120 FHKC
| Code | Published meaning |
|---|---|
| DH | Dolph Microwave |
| 120 | WR75 |
| FHKC | Conductive Gasket, full O-Ring for FBM100 Flange |
| FHK | Non-Conductive Gasket, full O-Ring for FBM100 Flange |
Product-family reference from the original page
The entries below are retained as published. Where they differ from the model-specific catalogue, confirm the selected configuration using the notes above.
| Component | Specifications |
|---|---|
| Nuts | Materials: Stainless Steel, Aluminum Alloy, Brass |
| Screws | Sizes: Multiple; Corrosion-Resistant |
| Washers | High-Strength Material; Enhances Support |
| Shims | Customizable; Precision Alignment |
Drawings and original documents
Waveguide Accessories
Download PDFFLANGE TYPE DESIGNATIONS INFORMATION
Download PDFOriginal flange designations and dimensional reference. Match the exact interface shown on your assembly drawing.
Include these details in your inquiry
- WR size and exact flange designation
- Gasket type and all required dimensions
- Conductive or non-conductive material
- Screw thread, length and finish
- Washer, nut and shim requirements
- Quantity per joint and total joint count



