The Coupler,directional, cataloged under National Stock Number 5985-01-109-3980, 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 Leonardo Uk Ltd. Government technical data includes 2 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-109-3980 |
| Primary Part Number | 28517-00270 |
| Item Name | Coupler,directional |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Leonardo Uk Ltd |
| Status | ACTIVE |
| Design Type | UNIDIRECTIONAL |
| Unit Type | TRANSMISSION LINE |
| 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 |
|---|---|
| 28517-00270 | Leonardo Uk Ltd (GBR) |
| Reference | Meaning |
|---|---|
| 28517-00270 | 5/9 Secondary reference Leonardo Mw Ltd |
| 2031-6335-00 | 3/9 Design control — primary reference U.S. Government activity |
| 3452353-1 | 5/2 Secondary reference U.S. Government activity |
NSN 5985-01-109-3980 is a Coupler,directional, manufactured by Leonardo Uk Ltd, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-109-3980 has 1 manufacturer part number on file: 28517-00270 (Leonardo Uk Ltd).
Key specifications for 28517-00270: Overall Height: 0.375 INCHES NOMINAL IN; Design Type: UNIDIRECTIONAL; Overall Length: 1.760 INCHES NOMINAL IN; Overall Width: 1.250 INCHES NOMINAL IN. 2 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.