The Coupler,directional, cataloged under National Stock Number 5985-01-021-5779, 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 Aimtron Systems, Llc. Government technical data includes 6 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 5985-01-021-5779 |
| Primary Part Number | 402289 |
| Item Name | Coupler,directional |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Aimtron Systems, Llc |
| Status | ACTIVE |
| FSC Application Data | RADAR ANTENNA SUPPORT SET AND RADOMES,EXCEPT SPECIALLY DESIGNED |
| Terminal Fitting Controlling Agency | MICROWAVE ASSOCIATES INC; JETDS |
| Usage Design | MAIN LINE AND SECONDARY LINE TERMINAL FITTING |
| Identifying Number | TERMINAL FITTING TYPE NO. N; PART NO. OSM 204CC; TYPE NO. UG-137B/U; TYPE NO. UG-138 |
| Design Type | BIDIRECTIONAL |
| Unit Type | COAXIAL LINE AND WAVEGUIDE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 402289 PRIMARY | Aimtron Systems, Llc (USA) |
| Reference | Meaning |
|---|---|
| 53234 | 5/9 Secondary reference U.S. Government activity |
| 402289 | 5/9 Secondary reference Cardion Inc |
| 5985PL0981896 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5985-01-021-5779 is a Coupler,directional, manufactured by Aimtron Systems, Llc, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-021-5779 has 1 manufacturer part number on file: 402289 (Aimtron Systems, Llc).
4 possible matches (shared part number, not a government interchangeability claim): 4730-01-259-1700, 3110-01-298-1331, 5365-01-583-1396. Verify interchangeability with system specifications before substitution.
Key specifications for 402289: Overall Height: 6.125 INCHES NOMINAL IN; FSC Application Data: RADAR ANTENNA SUPPORT SET AND RADOMES,EXCEPT SPECIALLY DESIGNED; Terminal Fitting Controlling Agency: MICROWAVE ASSOCIATES INC; JETDS; Usage Design: MAIN LINE AND SECONDARY LINE TERMINAL FITTING. 6 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.
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.