The Waveguide Assembly, cataloged under National Stock Number 5985-00-853-6701, 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 General Dynamics Mission Systems, Inc. Dba Gdms. Government technical data includes 29 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-00-853-6701 |
| Primary Part Number | 258-21669 |
| Item Name | Waveguide Assembly |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | General Dynamics Mission Systems, Inc. Dba Gdms |
| Status | ACTIVE |
| FSC Application Data | ANTENNAS,WAVEGUIDES,AND RELATED EQUIPMENT |
| Tubing Wall Construction Style | SEAMLESS SECOND TUBING SEGMENT |
| Tubing Wall Construction Style | CORRUGATED FIRST TUBING SEGMENT |
| Flange Inside Height | 0.396 INCHES MINIMUM AND 0.404 INCHES MAXIMUM ALL FLANGES IN |
| Flange Quantity | 2 |
| Precious Material | SILVER |
| Voltage Standing Wave Ratio | 1.08 |
| Style Designator | OFFSET BEND TYPE |
| Flexibility | FLEXIBLE FIRST TUBING SEGMENT |
| Flexibility | RIGID SECOND TUBING SEGMENT |
| Flange Inside Diameter | 1.407 INCHES MINIMUM AND 1.437 INCHES MAXIMUM ALL FLANGES IN |
| Waveguide Inside Width | 0.496 INCHES MINIMUM AND 0.504 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | INTERNAL, RECTANGULAR EXTERNAL, RECTANGULAR |
| Flange Outside Height | 1.610 INCHES MINIMUM AND 1.640 INCHES MAXIMUM ALL FLANGES IN |
| Waveguide Center to Center Distance | 2.037 INCHES MINIMUM AND 2.057 INCHES MAXIMUM IN |
| Flange Inside Width | 0.896 INCHES MINIMUM AND 0.904 INCHES MAXIMUM ALL FLANGES IN |
| Thread Direction | RIGHT-HAND ALL FLANGES FIRST CONNECTION FACILITY |
| Nominal Thread Size | 0.164 INCHES ALL FLANGES ALL CONNECTION FACILITIES IN |
| Waveguide Outside Height | 0.896 INCHES MINIMUM AND 0.904 INCHES MAXIMUM IN |
| Waveguide Outside Width | 0.996 INCHES MINIMUM AND 1.004 INCHES MAXIMUM IN |
| Flange Depth | 0.423 INCHES MINIMUM AND 0.453 INCHES MAXIMUM ALL FLANGES IN |
| Flange Outside Width | 1.610 INCHES MINIMUM AND 1.640 INCHES MAXIMUM ALL FLANGES IN |
| Surface Treatment | NICKEL AND COPPER AND SILVER ALL TUBING SEGMENT AND FLANGE ALL SURFACES |
| Precious Material and Location | INTERNAL AND EXTERNAL SURFACES SILVER |
| Waveguide Inside Height | 0.396 INCHES MINIMUM AND 0.404 INCHES MAXIMUM IN |
| Thread Class | 2B ALL FLANGES ALL CONNECTION FACILITIES |
| Thread Quantity Per Inch | 32 ALL FLANGES ALL CONNECTION FACILITIES |
| Material | COPPER ALLOY ALL TUBING JACKET |
| Flange Connecting Facility and Quantity | 8 THREADED HOLE(S) ALL FLANGES ALL CONNECTION FACILITIES |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 258-21669 | General Dynamics Mission Systems, Inc. Dba Gdms (USA) |
| Reference | Meaning |
|---|---|
| SM-D-459802 | 3/2 Design control — primary reference U.S. Government activity |
| 258-21669 | 5/9 Secondary reference U.S. Government activity |
NSN 5985-00-853-6701 is a Waveguide Assembly, manufactured by General Dynamics Mission Systems, Inc. Dba Gdms, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-00-853-6701 has 1 manufacturer part number on file: 258-21669 (General Dynamics Mission Systems, Inc. Dba Gdms).
Key specifications for 258-21669: FSC Application Data: ANTENNAS,WAVEGUIDES,AND RELATED EQUIPMENT; Tubing Wall Construction Style: SEAMLESS SECOND TUBING SEGMENT; Tubing Wall Construction Style: CORRUGATED FIRST TUBING SEGMENT; Flange Inside Height: 0.396 INCHES MINIMUM AND 0.404 INCHES MAXIMUM ALL FLANGES IN. 29 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 5985-00-853-6701 has DEMIL Code D. 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.