The Circulator,radio Frequency, cataloged under National Stock Number 5985-01-100-4320, 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 Merrimac Industries, Inc. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-100-4320 |
| Primary Part Number | FCW-1919/40781 |
| Item Name | Circulator,radio Frequency |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Merrimac Industries, Inc |
| Status | ACTIVE |
| Frequency Range Rating | +13.7 TO 14.3 GIGAHERTZ |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | Hazardous per DLA record (HMIC Y) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 990049 | Merrimac Industries, Inc (USA) |
| FCW-1919/40781 PRIMARY | Merrimac Industries, Inc (USA) |
| Reference | Meaning |
|---|---|
| FCW-1919 | 5/1 Secondary reference Merrimac Industries, Inc |
NSN 5985-01-100-4320 is a Circulator,radio Frequency, manufactured by Merrimac Industries, Inc, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-100-4320 has 2 manufacturer part numbers on file: 990049 (Merrimac Industries, Inc), FCW-1919/40781 (Merrimac Industries, Inc).
1 possible match (shared part number, not a government interchangeability claim): 6240-01-465-7702. Verify interchangeability with system specifications before substitution.
Key specifications for FCW-1919/40781: Overall Height: 2.000 INCHES NOMINAL IN; Overall Length: 8.000 INCHES NOMINAL IN; Frequency Range Rating: +13.7 TO 14.3 GIGAHERTZ. 1 specification is documented in the U.S. Government catalog.
Hazardous per DLA record (HMIC Y). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 5985-01-100-4320 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.