The Switch,radio Frequency Transmiss, cataloged under National Stock Number 5985-01-317-6836, 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 Robinson Laboratories Inc Dba Herley New England. Government technical data includes 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5985-01-317-6836 |
| Primary Part Number | MP-4121 |
| Item Name | Switch,radio Frequency Transmiss |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Robinson Laboratories Inc Dba Herley New England |
| Status | ACTIVE |
| Terminal Type and Quantity | 4 TURRET |
| Coaxial Connector Series Designation | SMA |
| 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 |
|---|---|
| MP-4121 PRIMARY | Robinson Laboratories Inc Dba Herley New England (USA) |
| MD-120K3 PRIMARY | Caes Mission Systems Llc (USA) |
| Reference | Meaning |
|---|---|
| 290130P1 | 1/2 Source control — Government-approved source U.S. Government activity |
| MA8438-S702 | 5/9 Secondary reference U.S. Government activity |
NSN 5985-01-317-6836 is a Switch,radio Frequency Transmiss, manufactured by Robinson Laboratories Inc Dba Herley New England, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-317-6836 has 2 manufacturer part numbers on file: MP-4121 (Robinson Laboratories Inc Dba Herley New England), MD-120K3 (Caes Mission Systems Llc).
1 possible match (shared part number, not a government interchangeability claim): 5895-01-325-2514. Verify interchangeability with system specifications before substitution.
Key specifications for MP-4121: Overall Height: 1.290 INCHES MINIMUM AND 1.310 INCHES MAXIMUM IN; Overall Length: 2.520 INCHES NOMINAL IN; Overall Width: 0.980 INCHES MINIMUM AND 1.020 INCHES MAXIMUM IN; Terminal Type and Quantity: 4 TURRET. 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.