The Attenuator,variable, cataloged under National Stock Number 5985-00-250-4033, 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 Shallco, Inc. Government technical data includes 23 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5985-00-250-4033 |
| Primary Part Number | A021 |
| Item Name | Attenuator,variable |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Shallco, Inc |
| Status | ACTIVE |
| Shaft Type | ROUND |
| Bushing Length | 0.312 INCHES NOMINAL IN |
| Impedance Rating in Ohms | 600.0 INPUT-OUTPUT |
| Body Diameter | 2.125 INCHES NOMINAL IN |
| Mounting Facility Type and Quantity | 1 THREADED BUSHING |
| Frequency Range | 0.000 KILOHERTZ MINIMUM AND 30.000 KILOHERTZ MAXIMUM |
| Shaft Diameter | 0.250 INCHES NOMINAL IN |
| Body Style | CYLINDRICAL W/SIDE TERMINALS |
| Adjustment Device Type and Quantity | 1 SHAFT |
| Overall Attenuation Range in Decibels | +0.0 TO 40.0 |
| Mounting Facility Screw Thread Series Designator | UNEF |
| Overall Attenuation Accuracy in Decibels | -1.00 TO 1.00 |
| Attenuation Per Step in Decibels | 4.0 |
| Attenuation Variation Method | STEPPED |
| Schematic Diagram Designator | BRIDGED "T" |
| Mounting Thread Quantity | 32 PER INCH |
| Shaft Length | 0.500 INCHES NOMINAL IN |
| Body Length | 2.000 INCHES NOMINAL IN |
| Mounting Facility Nominal Screw Thread Diameter | 0.375 INCHES IN |
| Application Design | AUDIO |
| Terminal Type and Quantity | 3 TAB, SOLDER LUG |
| Power Rating | 600.0 MILLIWATTS PEAK |
| Step Position Quantity | 10 |
| 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 |
|---|---|
| A021 PRIMARY | Shallco, Inc (USA) |
| Reference | Meaning |
|---|---|
| 410-4B1 | 5/9 Secondary reference Shallco, Inc |
NSN 5985-00-250-4033 is a Attenuator,variable, manufactured by Shallco, Inc, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-00-250-4033 has 1 manufacturer part number on file: A021 (Shallco, Inc).
Key specifications for A021: Shaft Type: ROUND; Bushing Length: 0.312 INCHES NOMINAL IN; Impedance Rating in Ohms: 600.0 INPUT-OUTPUT; Body Diameter: 2.125 INCHES NOMINAL IN. 23 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.