The Circulator,radio Frequency, cataloged under National Stock Number 5985-01-101-6288, 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 11 specifications, 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. 2 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 | 5985-01-101-6288 |
| Primary Part Number | 990050 |
| Item Name | Circulator,radio Frequency |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Merrimac Industries, Inc |
| Status | ACTIVE |
| Document Type | MILITARY SPECIFICATION |
| Length | 3.007 INCHES NOMINAL IN |
| Connection Method | WAVEGUIDE FLANGE |
| Flange Type | COVER |
| Flange Connecting Hole Diameter | 0.257 INCHES NOMINAL IN |
| Identification Designator | TYPE UG-584/U |
| Frequency Range Rating | +2.7 TO 2.9 GIGAHERTZ |
| Document Identification | MIL-F-3922/56 |
| Insertion Loss in Decibels | 0.5 |
| Flange Connection Facility Quantity | 8 |
| Width | 1.507 INCHES NOMINAL IN |
| 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 |
|---|---|
| 990050 PRIMARY | Merrimac Industries, Inc (USA) |
| FCW-1904/40781 | Merrimac Industries, Inc (USA) |
NSN 5985-01-101-6288 is a Circulator,radio Frequency, manufactured by Merrimac Industries, Inc, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-101-6288 has 2 manufacturer part numbers on file: 990050 (Merrimac Industries, Inc), FCW-1904/40781 (Merrimac Industries, Inc).
2 possible matches (shared part number, not a government interchangeability claim): 6625-01-361-3052, 6240-01-465-7712. Verify interchangeability with system specifications before substitution.
Key specifications for 990050: Document Type: MILITARY SPECIFICATION; Length: 3.007 INCHES NOMINAL IN; Connection Method: WAVEGUIDE FLANGE; Flange Type: COVER. 11 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 5985-01-101-6288 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.