The Seal,waveguide, cataloged under National Stock Number 5985-00-977-6175, is classified within Federal Supply Class 5985 (Antennas, Waveguides, and Related Equipment) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-00-977-6175 |
| Primary Part Number | 90WF56 |
| Item Name | Seal,waveguide |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc |
| Status | ACTIVE |
| FSC Application Data | MULTIAPPLICATION |
| Seal Thickness | 0.055 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN |
| Style Designator | FOR RECTANGULAR WAVEGUIDE AND FLANGE |
| Seal Outside Height | 1.620 INCHES MINIMUM AND 1.630 INCHES MAXIMUM IN |
| Seal Outside Width | 1.620 INCHES MINIMUM AND 1.630 INCHES MAXIMUM IN |
| Surface Treatment | TIN FIRST SEAL ALL SURFACES |
| Material | GLASS SECOND SEAL |
| Material | IRON FIRST SEAL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 90WF56 PRIMARY | Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc (USA) |
| 1652022-1REVC PRIMARY | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| MA1345S | 5/9 Secondary reference U.S. Government activity |
| 1652022-1 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 5985PL1331980 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 1345S | 5/9 Secondary reference U.S. Government activity |
| 1652022-1 | 5/9 Secondary reference Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc |
| 1652022-1 | 5/9 Secondary reference Advanced Technical Materials, Inc. Dba a T M |
NSN 5985-00-977-6175 is a Seal,waveguide, manufactured by Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-00-977-6175 has 2 manufacturer part numbers on file: 90WF56 (Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc), 1652022-1REVC (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
1 possible match (shared part number, not a government interchangeability claim): 4920-01-017-4482. Verify interchangeability with system specifications before substitution.
Key specifications for 90WF56: FSC Application Data: MULTIAPPLICATION; Seal Thickness: 0.055 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN; Style Designator: FOR RECTANGULAR WAVEGUIDE AND FLANGE; Seal Outside Height: 1.620 INCHES MINIMUM AND 1.630 INCHES MAXIMUM IN. 8 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 5985-00-977-6175 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.