The Coupler,rotary,radio Frequency, cataloged under National Stock Number 5985-00-052-0817, 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 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-00-052-0817 |
| Primary Part Number | 20-1391 |
| Item Name | Coupler,rotary,radio Frequency |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc |
| Status | ACTIVE |
| FSC Application Data | RADAR SETS,AIRBORNE,EXCEPT FIRE CONTROL AND GUIDED MISSILE |
| Radio Frequency Rating | 9.4 GIGAHERTZ MINIMUM AND 9.8 GIGAHERTZ MAXIMUM |
| Unit Type | WAVEGUIDE |
| Mounting Configuration | 2 MTG HOLES,0.190 IN. - 32THD INSERTS ON 1.312 IN. BY 0.375 IN. MTG CENTERS IN |
| Material | COPPER ALLOY |
| 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 |
|---|---|
| 20-1391 PRIMARY | Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc (USA) |
| Reference | Meaning |
|---|---|
| A25A109-001-101 | 5/9 Secondary reference Goodyear Tire and Rubber Co the |
| A25A109-001-101 | 5/2 Secondary reference U.S. Government activity |
NSN 5985-00-052-0817 is a Coupler,rotary,radio Frequency, manufactured by Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-00-052-0817 has 1 manufacturer part number on file: 20-1391 (Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc).
3 possible matches (shared part number, not a government interchangeability claim): 5945-00-137-4379, 1020-00-143-2308, 5910-01-565-3508. Verify interchangeability with system specifications before substitution.
Key specifications for 20-1391: Overall Height: 3.781 INCHES NOMINAL IN; FSC Application Data: RADAR SETS,AIRBORNE,EXCEPT FIRE CONTROL AND GUIDED MISSILE; Radio Frequency Rating: 9.4 GIGAHERTZ MINIMUM AND 9.8 GIGAHERTZ MAXIMUM; Overall Length: 11.482 INCHES NOMINAL IN. 5 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 5985-00-052-0817 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.