The Isolator,radio Frequency Reflect, cataloged under National Stock Number 5985-00-111-4539, 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 L3harris Technologies, Inc Div Space & Airborne Systems. Government technical data includes 11 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5985-00-111-4539 |
| Primary Part Number | G300190S2 |
| Item Name | Isolator,radio Frequency Reflect |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | L3harris Technologies, Inc Div Space & Airborne Systems |
| Status | ACTIVE |
| Document Type | MILITARY SPECIFICATION |
| Length | 3.000 INCHES NOMINAL IN |
| Flange Quantity | 2 |
| Overall Diameter | 5.250 INCHES NOMINAL IN |
| Flange Type | COVER |
| Identification Designator | TYPE UG-53/U |
| Frequency Range Rating | +2.887 TO 2.893 GIGAHERTZ |
| Document Identification | MIL-F-3922 |
| Flange Connection Facility Quantity | 6 |
| Flange Connecting Hole Thread Size | 1/4-20 |
| Width | 1.500 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| G300190S2 | L3harris Technologies, Inc Div Space & Airborne Systems (USA) |
| Reference | Meaning |
|---|---|
| MA8P17 | 3/9 Design control — primary reference U.S. Government activity |
| 300190-2 | 5/9 Secondary reference Gould Inc Defense Systems Navcom Systems Div 3dbm Opns |
NSN 5985-00-111-4539 is a Isolator,radio Frequency Reflect, manufactured by L3harris Technologies, Inc Div Space & Airborne Systems, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-00-111-4539 has 1 manufacturer part number on file: G300190S2 (L3harris Technologies, Inc Div Space & Airborne Systems).
1 possible match (shared part number, not a government interchangeability claim): 5930-01-112-6162. Verify interchangeability with system specifications before substitution.
Key specifications for G300190S2: Document Type: MILITARY SPECIFICATION; Length: 3.000 INCHES NOMINAL IN; Flange Quantity: 2; Overall Diameter: 5.250 INCHES NOMINAL IN. 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 5985-00-111-4539 has DEMIL Code B. 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.