The Attenuator,fixed, cataloged under National Stock Number 5985-01-054-4747, 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 General Microwave Corporation Div Kratos Microwave Electronics. Government technical data includes 15 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5985-01-054-4747 |
| Primary Part Number | 8557P4 |
| Item Name | Attenuator,fixed |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | General Microwave Corporation Div Kratos Microwave Electronics |
| Status | ACTIVE |
| Frequency Range | 0.000 HERTZ MINIMUM AND 0.000 HERTZ MINIMUM AND 18.000 GIGAHERTZ MAXIMUM18.000 GIGAHERTZ MAXIMUM |
| Body Style | ROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACEROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACE |
| Overall Diameter | 0.810 INCHES MAXIMUM0.810 INCHES MAXIMUM IN |
| Voltage Standing Wave Ratio | 1.15 AND 1.15 AND 1.20 AND 1.20 AND 1.25 AND 1.25 AND 1.401.40 |
| Input Impedance Rating in Ohms | 50.050.0 |
| Mounting Method | CONNECTORCONNECTOR |
| Rf Signal Attenuation in Decibels | 20.020.0 |
| Connection Type Per Function | FEMALE INPUT AND FEMALE INPUT AND MALE OUTPUTMALE OUTPUT |
| Voltage Standing Wave Ratio Frequency Range | +0.0 TO 4.0 GIGAHERTZ AND +0.0 TO 4.0 GIGAHERTZ AND +4.0 TO 8.0 GIGAHERTZ AND +4.0 TO 8.0 GIGAHERTZ AND +8.0 TO 12.4 GIGAHERTZ AND +8.0 TO 12.4 GIGAHERTZ AND +12.4 TO 18.0 GIGAHERTZ+12.4 TO 18.0 GIGAHERTZ |
| Application Design | TRANSMISSION LINETRANSMISSION LINE |
| Material | STEEL CORROSION RESISTING BODY |
| Power Rating | 2.0 WATTS AVERAGE AND 2.0 WATTS AVERAGE AND 500.0 WATTS PEAK500.0 WATTS PEAK |
| Terminal Type and Quantity | 2 CONNECTOR2 CONNECTOR |
| Output Impedance Rating in Ohms | 50.050.0 |
| Coaxial Connector Series Designation | NN |
| 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 |
|---|---|
| 388-20DB | Cinch Connectivity Solutions Inc (USA) |
| 8557P4 PRIMARY | General Microwave Corporation Div Kratos Microwave Electronics (USA) |
| Reference | Meaning |
|---|---|
| 388-20 | C/1 Advisory reference — outside the item-of-supply concept Cinch Connectivity Solutions Inc |
NSN 5985-01-054-4747 is a Attenuator,fixed, manufactured by General Microwave Corporation Div Kratos Microwave Electronics, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-054-4747 has 2 manufacturer part numbers on file: 388-20DB (Cinch Connectivity Solutions Inc), 8557P4 (General Microwave Corporation Div Kratos Microwave Electronics).
1 possible match (shared part number, not a government interchangeability claim): 4720-01-317-8936. Verify interchangeability with system specifications before substitution.
Key specifications for 8557P4: Frequency Range: 0.000 HERTZ MINIMUM AND 0.000 HERTZ MINIMUM AND 18.000 GIGAHERTZ MAXIMUM18.000 GIGAHERTZ MAXIMUM; Body Style: ROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACEROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACE; Overall Diameter: 0.810 INCHES MAXIMUM0.810 INCHES MAXIMUM IN; Voltage Standing Wave Ratio: 1.15 AND 1.15 AND 1.20 AND 1.20 AND 1.25 AND 1.25 AND 1.401.40. 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.
NSN 5985-01-054-4747 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.