The Waveguide Assembly, cataloged under National Stock Number 5985-01-400-1998, 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 L3 Technologies, Inc. Div L3 Keo. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Waveguide Assembly |
| FSC / FSG | 5985 — Antennas, Waveguides, and Related Equipment (FSG 59) |
| Manufacturers | L3 Technologies, Inc. Div L3 Keo (CAGE 34228); Frontgrade Technologies Inc. (CAGE 66544); Microtech Inc Dba Microtech Inc (CAGE 54647) |
| Parameter | Value |
|---|---|
| NSN | 5985-01-400-1998 |
| Primary Part Number | 1979778 |
| Item Name | Waveguide Assembly |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | L3 Technologies, Inc. Div L3 Keo |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Part Number | Manufacturer |
|---|---|
| 1979778 PRIMARY | L3 Technologies, Inc. Div L3 Keo (USA) |
| 1979778 | Frontgrade Technologies Inc. (USA) |
| 1979778 | Microtech Inc Dba Microtech Inc (USA) |
| Reference | Meaning |
|---|---|
| 1979778 | 5/9 Secondary reference Kevlin Corporation Dba Cobham Sensor Systems Div Kevlin Division |
| 1979778 | C/1 Advisory reference — outside the item-of-supply concept Atlantic Microwave Corporation Div Cobham Electronic Systems |
| 1979778 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
NSN 5985-01-400-1998 is a Waveguide Assembly, manufactured by L3 Technologies, Inc. Div L3 Keo, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-400-1998 has 3 manufacturer part numbers on file: 1979778 (L3 Technologies, Inc. Div L3 Keo), 1979778 (Frontgrade Technologies Inc.), 1979778 (Microtech Inc Dba Microtech Inc).
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 5985-01-400-1998 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.