The Attenuator,variable, cataloged under National Stock Number 5985-00-166-0354, 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 Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-00-166-0354 |
| Primary Part Number | 2678490-4 |
| Item Name | Attenuator,variable |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Shaft Type | ROUND |
| Insertion Loss at Minimum Attenuation in Maximum Decibels | 6.0 |
| Impedance Rating in Ohms | 75.0 INPUT-OUTPUT |
| Mounting Facility Type and Quantity | 1 THREADED BUSHING |
| Frequency Range | 0.000 HERTZ MINIMUM AND 300.000 MEGAHERTZ MAXIMUM |
| Shaft Diameter | 0.237 INCHES NOMINAL IN |
| Adjustment Device Type and Quantity | 1 SHAFT |
| Overall Attenuation Range in Decibels | +0.0 TO 110.0 |
| Voltage Standing Wave Ratio | 1.25 |
| Overall Attenuation Accuracy in Decibels | -0.10 TO 0.10 |
| Attenuation Variation Method | CONTINUOUS |
| Shaft Length | 1.250 INCHES NOMINAL IN |
| Application Design | TRANSMISSION LINE |
| Terminal Type and Quantity | 2 CONNECTOR, COAXIAL, MALE |
| Power Rating | 100.0 MILLIWATTS PEAK |
| Coaxial Connector Series Designation | BNC |
| 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 |
|---|---|
| 2678490-4 PRIMARY | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| CA100-75RA | 5/9 Secondary reference Trilithic, Inc. |
NSN 5985-00-166-0354 is a Attenuator,variable, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-00-166-0354 has 1 manufacturer part number on file: 2678490-4 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
Key specifications for 2678490-4: Shaft Type: ROUND; Insertion Loss at Minimum Attenuation in Maximum Decibels: 6.0; Impedance Rating in Ohms: 75.0 INPUT-OUTPUT; Mounting Facility Type and Quantity: 1 THREADED BUSHING. 16 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 5985-00-166-0354 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.