The Attenuator,fixed, cataloged under National Stock Number 5985-00-030-2970, 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 Crane Electronics, Inc.. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5985-00-030-2970 |
| Primary Part Number | 57-2051 |
| Item Name | Attenuator,fixed |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Crane Electronics, Inc. |
| Status | ACTIVE |
| FSC Application Data | ANTENNAS,WAVEGUIDES,AND RELATED EQUIPMENT |
| Mounting Hole/stud Quantity | 4 |
| Frequency Range | 1.000 GIGAHERTZ MINIMUM AND 4.000 GIGAHERTZ MAXIMUM |
| Body Style | ROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACE |
| Overall Diameter | 0.875 INCHES NOMINAL IN |
| Input Impedance Rating in Ohms | 50.0 |
| Mounting Method | FLANGE WITH MOUNTING HOLE |
| Rf Signal Attenuation in Decibels | 20.0 |
| Attenuation Accuracy in Decibels | +0.00 TO 0.10 |
| Unthreaded Mounting Hole Diameter | 0.125 INCHES NOMINAL IN |
| Application Design | TRANSMISSION LINE |
| Power Rating | 5.0 WATTS AVERAGE |
| Terminal Type and Quantity | 2 CONNECTOR |
| Output Impedance Rating in Ohms | 50.0 |
| 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 |
|---|---|
| 57-2051 PRIMARY | Crane Electronics, Inc. (USA) |
| Reference | Meaning |
|---|---|
| CN-111/U | 5/2 Secondary reference U.S. Government activity |
NSN 5985-00-030-2970 is a Attenuator,fixed, manufactured by Crane Electronics, Inc., classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-00-030-2970 has 1 manufacturer part number on file: 57-2051 (Crane Electronics, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 5325-00-979-6374. Verify interchangeability with system specifications before substitution.
Key specifications for 57-2051: FSC Application Data: ANTENNAS,WAVEGUIDES,AND RELATED EQUIPMENT; Mounting Hole/stud Quantity: 4; Frequency Range: 1.000 GIGAHERTZ MINIMUM AND 4.000 GIGAHERTZ MAXIMUM; Body Style: ROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACE. 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.