The Attenuator,variable, cataloged under National Stock Number 5985-00-259-0423, 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 15 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. 6 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 | 5985-00-259-0423 |
| Primary Part Number | 51599 |
| Item Name | Attenuator,variable |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | L3harris Technologies, Inc Div Space & Airborne Systems |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 4 UNTHREADED HOLE(S) |
| FSC Application Data | ANTENNAS,WAVEGUIDES,AND RELATED EQUIPMENT |
| Frequency Range | 9.030 MEGAHERTZ MINIMUM AND 9.190 MEGAHERTZ MAXIMUM |
| Mounting Facility Pattern | FOUR POSITION RECTANGULAR |
| Center to Center Distance Between Mounting Facilities Parallel to Length | 2.500 INCHES NOMINAL IN |
| Overall Attenuation Range in Decibels | +1.0 TO 18.5 |
| Voltage Standing Wave Ratio | 1.20 |
| Unthreaded Mounting Hole Diameter | 0.312 INCHES NOMINAL IN |
| Overall Attenuation Accuracy in Decibels | -1.00 TO 1.00 |
| Attenuation Variation Method | CONTINUOUS |
| Body Material | COPPER ALLOY |
| Center to Center Distance Between Mounting Facilities Parallel to Width | 2.500 INCHES NOMINAL IN |
| Application Design | WAVEGUIDE |
| Terminal Type and Quantity | 2 FLANGE |
| Power Rating | 500.0 MILLIWATTS AVERAGE |
| 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 |
|---|---|
| 51599 PRIMARY | L3harris Technologies, Inc Div Space & Airborne Systems (USA) |
NSN 5985-00-259-0423 is a Attenuator,variable, manufactured by L3harris Technologies, Inc Div Space & Airborne Systems, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-00-259-0423 has 1 manufacturer part number on file: 51599 (L3harris Technologies, Inc Div Space & Airborne Systems).
6 possible matches (shared part number, not a government interchangeability claim): 5365-00-356-3520, 5970-00-501-0716, 1680-00-707-7136. Verify interchangeability with system specifications before substitution.
Key specifications for 51599: Mounting Facility Type and Quantity: 4 UNTHREADED HOLE(S); Overall Height: 1.625 INCHES NOMINAL IN; FSC Application Data: ANTENNAS,WAVEGUIDES,AND RELATED EQUIPMENT; Frequency Range: 9.030 MEGAHERTZ MINIMUM AND 9.190 MEGAHERTZ MAXIMUM. 15 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.