The Attenuator,fixed, cataloged under National Stock Number 5985-01-057-8944, 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 Northrop Grumman Support Services Corp. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-057-8944 |
| Primary Part Number | 128C539H03 |
| Item Name | Attenuator,fixed |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Northrop Grumman Support Services Corp |
| Status | ACTIVE |
| Frequency Range | 0.000 HERTZ MINIMUM AND 0.000 HERTZ MINIMUM AND 4.000 GIGAHERTZ MAXIMUM4.000 GIGAHERTZ MAXIMUM |
| Body Style | ROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACEROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACE |
| Overall Diameter | 0.390 INCHES MAXIMUM0.390 INCHES MAXIMUM IN |
| Voltage Standing Wave Ratio | 1.251.25 |
| Input Impedance Rating in Ohms | 50.050.0 |
| Mounting Method | CONNECTORCONNECTOR |
| Rf Signal Attenuation in Decibels | 10.010.0 |
| Attenuation Accuracy in Decibels | -0.80 TO 0.80-0.80 TO 0.80 |
| Surface Treatment | PASSIVATE BODY |
| Connection Type Per Function | FEMALE OUTPUT AND FEMALE OUTPUT AND MALE INPUTMALE INPUT |
| Voltage Standing Wave Ratio Frequency Range | +0.0 TO 4.0 GIGAHERTZ+0.0 TO 4.0 GIGAHERTZ |
| Application Design | TRANSMISSION LINETRANSMISSION LINE |
| Material | STEEL CORROSION RESISTING BODY |
| Terminal Type and Quantity | 2 CONNECTOR2 CONNECTOR |
| Output Impedance Rating in Ohms | 50.050.0 |
| Coaxial Connector Series Designation | SMASMA |
| 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 |
|---|---|
| 128C539H03 PRIMARY | Northrop Grumman Support Services Corp (USA) |
| Reference | Meaning |
|---|---|
| 2082-4148-10 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 128C539H03 | 3/9 Design control — primary reference U.S. Government activity |
NSN 5985-01-057-8944 is a Attenuator,fixed, manufactured by Northrop Grumman Support Services Corp, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-057-8944 has 1 manufacturer part number on file: 128C539H03 (Northrop Grumman Support Services Corp).
Key specifications for 128C539H03: Frequency Range: 0.000 HERTZ MINIMUM AND 0.000 HERTZ MINIMUM AND 4.000 GIGAHERTZ MAXIMUM4.000 GIGAHERTZ MAXIMUM; Body Style: ROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACEROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACE; Overall Diameter: 0.390 INCHES MAXIMUM0.390 INCHES MAXIMUM IN; Voltage Standing Wave Ratio: 1.251.25. 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 5985-01-057-8944 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.